- Abstract：The commercialization of organic solar cells (OSCs) requires a transition from laboratory-scale spin-coating to high-throughput, environmentally friendly printing technologies. However, rapid crystallization and non-equilibrium molecular assembly during green-solvent processing often induce disordered morphologies and severe efficiency losses. Here, we introduce two nonhalogenated solid additives, 2-methoxynaphthalene (2-MN) and 2,7-dimethoxynaphthalene (2,7-MN), to regulate crystallization kinetics and film formation in blade-coated OSCs processed from the green solvent o-xylene. Benefiting from its symmetric molecular structure and stronger intermolecular interactions, 2,7-MN effectively prolongs the liquid-solid transition and suppresses premature aggregation, enabling the formation of a highly ordered bi-continuous interpenetrating network with optimized charge-transport pathways. As a result, green-solvent-processed OSCs achieve a champion power conversion efficiency of 20.19% with an exceptional fill factor of 81.52%. Notably, the morphology control enabled by 2,7-MN remains robust under high-speed coating (30 m·min–1), maintaining efficiencies approaching 19%. Importantly, large-area modules (15.84 and 76.95 cm2) deliver impressive efficiencies of 16.80% and 15.71%, respectively, which are the highest values reported in green-solvent-processed OSCs so far. This work establishes solid-additive engineering as an effective strategy for controlling non-equilibrium film formation toward scalable and sustainable organic photovoltaics.Keywords：Organic solar cells;Environmentally friendly solvents;Solid additives;High-speed blade-coating;Large-area modules2|0|0
Updated：2026-11-03 - Abstract：Thermoplastic polyimide (TPI) insulated wires, which exhibit excellent insulating and radiation-resistant properties at extremely low temperatures, are designated as connection lines for the quench detection system of superconducting magnets. However, extensive cracking was unexpectedly observed after the implementation of vacuum pressure impregnation (VPI). The cracking behavior of TPI-insulated wires during the VPI process was systematically investigated. The results reveal that the failure is a multi-factor coupled phenomenon involving synergistic interactions between thermal, mechanical, and chemical mechanisms. First, the coiled configuration imposes sustained tensile stress on the outer arc of the insulation, while the extrusion process introduces molecular orientation and residual stresses into the TPI matrix. Although the VPI temperature (130 °C, 72 h) is well below the glass transition temperature (about 245 °C), sub-Tg segmental relaxation and amorphous structural rearrangement occurred, leading to free volume redistribution and residual stress relaxation. The constraint of the metallic conductor further restricts dimensional recovery, thereby promoting microcrack initiation. Second, low-molecular-weight species from the epoxy system, particularly the curing agent HY918 and the accelerator DY073-1, permeate into the amorphous regions of TPI, causing plasticization, swelling, and enhanced segmental mobility, which significantly reduces the local resistance to yielding and crack propagation. Under sustained bending stress, this results in a typical environmental stress cracking (ESC) acceleration effect. Third, the substantial mismatch in the coefficients of thermal expansion between the TPI and the metallic conductor generates considerable thermal stresses during the VPI thermal cycle, further exacerbating the cracking risk. Based on the mechanistic understanding, a protective strategy was implemented by wrapping the TPI wires with a thermal insulation layer prior to VPI. The protected specimens successfully passed the vacuum Paschen test, confirming that this approach effectively prevented resin permeation and thermally induced structural transitions in TPI insulation. This strategy provides a reference for the failures of quench diagnostic wires in similar superconducting magnets.Keywords：Thermoplastic polyimide;Segmental relaxation;Environmental stress cracking;Electrical insulation2|0|0Updated：2026-11-03
- Abstract：Tread wear of aircraft tires is governed by harsh service conditions and material composition, which directly affect their service life. However, insufficient understanding of abrasion mechanisms under harsh service conditions imposes restrictions on the design and preparation of rubber materials with high abrasion resistance and low heat build-up. In this study, coumarone resin (CMR) and two types of tert-octyl phenolic resins, namely resole (PR45) and novolac (PR68), were introduced into natural rubber (NR) composites owing to their good compatibility with NR. To clarify the separate effects of large slip angle and high speed, the abrasion behavior of NR composites with different resins was evaluated under large-slip-angle abrasion (20° slip angle, 2.5 km/h) and high-speed abrasion (5° slip angle, 45 km/h) using a Laboratory Abrasion Tester 100 (LAT 100). The results showed that large-slip-angle abrasion was much more severe than high-speed abrasion, indicating that a large lateral force resulting from a large slip angle is much more detrimental to abrasion resistance than the surface temperature rise from high speed. Compared with CMR, both PR45 and PR68 improved the abrasion resistance of the NR composite under large-slip-angle conditions. The NR composite with PR68 also exhibited the lowest heat build-up among the three composites owing to its high cross-link density and uniform filler dispersion. Considering the abrasion resistance under a large slip angle and the overall performance, the PR68 composite exhibits great potential for extending the service life of aircraft tire treads.Keywords：Resins;Abrasion resistance;Aircraft tires;Large slip angle;High speed11|10|0Updated：2026-10-30
- Abstract：Compared with micelles and vesicles formed by the aggregation of conventional polymer chains, the aggregates of grafted nanoparticles demonstrate superior performance in structural stability, functional diversity, and application adaptability. These characteristics indicate their greater potential in fields such as drug delivery, biomaterials, and intelligent responsive systems. To further expand the range of achievable morphologies, this study introduces co-solvent effects into polymer-grafted nanoparticle systems assembled via polymerization-induced self-assembly (PISA). A nanoparticle model featuring dual symmetric initiation sites was developed, and dissipative particle dynamics (DPD) simulations were combined with a stochastic polymerization reaction to systematically investigate the influence of co-solvent interaction strength, nanoparticle filling ratio, and hydrophobic chain length on the self-assembly behavior of grafted nanoparticles. The results reveal that, by precisely tuning the simulation parameters, the controlled formation of various morphologies can be achieved, ranging from conventional spherical and lamellar structures to highly ordered helical aggregates which are preferentially formed when both solvents are strongly solvophobic toward the grafted chains, while a slight asymmetry exists between the two solvent–chain interaction strengths. These findings offer new theoretical insights and methodological support for the morphological control and functional design of polymer-based nanocomposites.Keywords：Grafted nanoparticles;Co-solvent effect;Self-assembly;Dissipative particle dynamics12|4|0Updated：2026-10-30
- Abstract：This work reports the synthesis of a new N,O-type nickel complex and its application in a Ni–AlEt3–BF3·MeOH catalytic system for homo- and co-oligomerization of 1-hexene and vinyl acetate. The system shows variable activity depending on the AlEt3 content and monomer ratio: 3.5 kg·(molNi·h)–1 for 1-hexene, 10.4 kg·(molNi·h)–1 for vinyl acetate, and up to 12.5 kg·(molNi·h)–1 in co-oligomerization (40 °C, toluene). Vinyl acetate is more reactive, and varying the monomer ratio allows control over the molecular weight and copolymer composition. Atmospheric pressure chemical ionization (APCI+/APCI–) mass spectrometry revealed chains with different initiating groups (H―, Et―, Bu―, and―CH2CH2―), indicating the involvement of Ni–alkyl, Ni–hydride, and Ni–ethylene species. 13C-NMR and quantum chemical calculations show predominant 1,2-insertion of alkenes, as well as mainly syndiotactic fragments, and isomerization of 1-hexene to 3-hexene at the nickel center. An ionic mechanism is proposed in which the balance of active Ni species and competitive monomer coordination governs the catalytic activity and product structure. Differential scanning calorimetry showed that the thermal behavior of the co-oligomers was strongly dependent on the AlEt3 content and comonomer ratio, underscoring their potential as tunable functionalized additives.Keywords：Ni complexes;Co-oligomerization;Vinyl acetate;α-Olefins;Coordination polymerization15|4|0Updated：2026-10-30
- Abstract：Piezoelectric elastic composites based on polydimethylsiloxane (PDMS) elastomer filled with polar phase poly(vinylidene fluoride) (PVDF) microspheres are fabricated. The regulatory role of the elastic polymer matrix structure on the performance of the composite, which is less concerned in previous studies, is explored. Here, we have elucidated that precise control of the PDMS crosslinked network governs the stress transfer mechanism, enabling rational design of high-performance piezoelectric composites. By tuning the crosslinker ratio, we achieve PDMS crosslinking densities ranging from 9.9×10–6 mol·cm–3 to 91.3×10–6 mol·cm–3, enhancing the output voltage of the piezoelectric composite with 10 wt% PVDF microsphere content from 5.3 V to 19.8 V. Finite element simulation attributes this enhancement to more efficient stress transfer within the elastomer matrix with higher crosslinking density, strengthening the dipole polarization response of polar PVDF microspheres. By increasing PVDF microsphere content to 30 wt%, the composite exhibits a piezoelectric coefficient (d33) of 74 pC·N–1 and a sensitivity of 647 mV·N–1, which are 37 and 20 times higher than unoptimized composites in this work, respectively. This work advances understanding of mechanoelectrical coupling in flexible piezocomposites and provides a platform for designing next-generation sensors for intelligent robotics and non-contact acoustic sensing.Keywords：Crosslinking density engineering;Piezoelectric composite;Stress transfer mechanism;Flexible electronics12|10|0Updated：2026-10-30
- Abstract：Poly(vinylidene fluoride) (PVDF)-based relaxor ferroelectric polymers incorporating groups with strong dipole moments can display multifunctional electrical responses and are highly promising for flexible electronics. Despite their evident advantages and years of research, achieving precise control over the dipole alignment and switching remains elusive, hindering further performance optimization. This study introduces a structural optimization strategy to modulate the multi-level structure of poly(vinylidene fluoride-co-trifluoroethylene-co-chlorofluoroethylene) (P(VDF-TrFE-CFE)) relaxor polymer. This approach enhances crystallinity, promotes chain orientation across both crystalline and amorphous regions, expands interplanar spacing and simultaneously introduces significant conformational disorder within nanosized polar domains. Such oriented nanofilms demonstrate stable relaxor characteristics with double the polarization intensity of unoriented films. Oriented relaxor polymers also uncover highly efficient cooperative polarization switching dynamics, which are both faster and more concentrated than those of their non-oriented counterparts. These findings provide key insights into relaxor behavior and establish a practical framework for the development of advanced low-field flexible electronics.Keywords：P(VDF-TrFE-CFE);Relaxor polymer;Melt-drawn film;Orientation;Polarization switching8|2|0Updated：2026-10-30
- Abstract：Biodegradable aliphatic polyesters are promising alternatives to conventional plastics, which can be synthesized by the ring-opening polymerization (ROP) of the corresponding lactones. ROP of four-membered β-propiolactone (BPL) provides an efficient approach to poly(3-hydroxypropionate), a class of polyhydroxyalkanoate materials. Although numerous organocatalytic systems, including those based on organic bases, have been exploited to achieve high efficiency and high molecular weights, the ring-opening mechanism of BPL and associated experimental evidence remain unclear. Specifically, for the ring-opening polymerization of BPL catalyzed by organic base/alcohol systems, further experimental evidence is required to elucidate the site that undergoes nucleophilic attack: attack at the carbonyl carbon versus the β-carbon of BPL results in acyl-oxygen cleavage and alkyl-oxygen cleavage of the monomer, respectively. The dominant reaction pathway for this system has not been definitively confirmed to date. In this work, using organic bases/alcohol as the catalytic system, we propose an experimental strategy to distinguish the ring-opening pathway of BPL by quenching the polymerization with benzyl bromide. The results illustrated that organic bases preferentially abstracted the α-proton of BPL, generating an acrylate anion as the actual initiator. The ROP of BPL is processed via an alkyl-cleavage mechanism, in which the acrylate initiator attacks the β-carbon of BPL. This research will facilitate the rational design of catalysts for the ROP of BPL in the future.Keywords：β-Propiolactone;Organocatalysis;Ring-opening polymerization;Mechanism study;Polyhydroxyalkanoates12|14|0Updated：2026-10-28
- Abstract：Biodegradable poly(L-lactide) (PLLA)/poly(ε-caprolactone) (PCL) blends exhibit poor toughness because of their incompatibility. In this study, double-graft polymers (DCL) with different molecular weights of poly(D-lactide) (PDLA) were successfully synthesized through grafting PDLA and PCL onto the multifunctional epoxy-based styrene-acrylic oligomer (ADR) molecular chain by reactive blending, and their structures were confirmed by FTIR and 1H-NMR spectra. Based on contact angle measurements and interfacial tension calculations, the graft copolymers preferentially localized at the interface between the two phases. This interfacial arrangement enhanced the interactions across the blend. The incorporation of PDLA was found to induce the formation of stereocomplex (SC) crystallites, which markedly reinforced the interfacial adhesion within the PLLA/PCL blend. Consequently, the elongation at break of the compatibilized blends exhibited an increasing trend with increasing compatibilizer content. Among them, the PLLA/PCL blend containing 5 wt% DCL with PDLA segments of 20 kg/mol exhibited the best tensile performance, outperforming the corresponding blend containing the double-graft copolymer with PLLA segments (LCL) owing to the formation of SC crystallites. Meanwhile, the influences of PDLA in DCL with varying Mn,designed on the morphology, crystallization, mechanical, thermal, and rheological properties of PLLA/PCL blends were investigated. It was found that DCL with a moderate length of PDLA (e.g., Mn,designed=20 kg/mol) displayed better compatibilization efficiency than copolymers with shorter or longer PDLA chains, significantly reducing the size of PCL domains and improving the dispersion uniformity. After incorporating DCL with the PDLA of Mn,designed=20 kg/mol, the elongation at break and fracture energy of the PLLA/PCL blends reached 304% and 9.7 kJ/m3, respectively, which were 20 and 24 times higher than those of the original PLLA/PCL. Compared to the uncompatibilized blend, the compatibilized blends displayed denser spherulites, which were derived from the nucleation of SC crystallization. The mechanical properties of the blends were improved through the transformation of the size and dispersion of PCL domains, and the size of spherulites tuned by PDLA with different molecular weights. By adjusting the molecular weight of PDLA in the compatibilizer, this study offers a strategy for fabricating PLLA-based materials with outstanding toughness.Keywords：Poly(L-lactide);Double graft polymer;Stereocomplex crystallites;Toughness;Crystallization13|4|0Updated：2026-10-28
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3D Printing of Photosensitive Poly(oxime-urethane) for Network Rearrangement and Interfacial Welding
Abstract：Digital light processing (DLP) 3D printing enables high-resolution and efficient fabrication, yet achieving multimaterial printing with robust mechanical performance remains challenging due to limitations in the molecular design. Here, we report a photo-thermal dual-curing strategy to address this challenge. The photosensitive poly(oxime-urethane) resin, which forms ionic bonding between carboxylic acid and 2-(dimethylamino)ethyl methacrylate, exhibits excellent printability with low viscosity (below 5000 mPa·s), high storage moduli after gelation (exceeding 105 Pa), and high storage stability (over 30 days). The post-printing thermal curing between carboxylic acid and oxime-urethane bonds enables network rearrangement for mechanical enhancement and interfacial welding of modules with diverse properties. This dynamic chemical design facilitates high-performance multimaterial integration, significantly expanding the design flexibility and versatility for the fabrication of complex structures.Keywords：3D printing;Dynamic covalent bonds;Photopolymerization;Photo-thermal dual-curing;Oxime-urethane9|10|0Updated：2026-10-28 - Abstract：The rugged free-energy landscape of block copolymers features a multitude of local free-energy minima in addition to the only global free-energy minimum, giving rise to long-lived metastable states and enabling the fabrication of desired, metastable mesostructure in a process-accessible manner. Considering that the fabrication of perforated lamellar mesostructures in block copolymers via the stabilization strategy by either fine-tuning the chain architecture of the block copolymer or blending cannot fix the stacking sequence of hexagonally perforated layers in experiments due to similar free energies of different stacking sequences and leads to limited stable regions, using general symmetry considerations, we design a symmetry-conserving process to obtain the desired perforated lamellar mesostructure. The thermodynamically stable iHPa with P6/mmm symmetry of No. 191 space group in linear
$ {B}_{1}{A}_{1}{B}_{2}{A}_{2}{B}_{3} $ $ {\tilde{B}}_{1}{\tilde{C}}_{1}{A}_{1}{B}_{2}{A}_{2}{C}_{3} $ $ {C}_{1}{A}_{1}{B}_{2}{A}_{2}{C}_{3} $ $ {C}_{1}{A}_{1}{\tilde{C}}_{2}{\tilde{B}}_{2}{A}_{2}{C}_{3} $ Keywords：Block copolymer;Perforated lamellar mesostructure;P6/mmm symmetry;Process-directed self-assembly;Field theory10|2|0Updated：2026-10-28 - Abstract：Paper with short-term thermal shock resistance is crucial for applications such as electrical insulation yet suffers from yellowing and mechanical degradation under transient heat exposure. In this study, robust and flexible temperature-resistant paper was developed using a hybrid strategy of material selection and process optimization. The findings reveal that cotton fibers (10 wt%–40 wt% content) synergistically improve both the tensile strength and heat-induced enhancement effects. Aramid fibers, owing to their intrinsic thermal stability, serve as the most effective component for color protection, whereas basalt fibers provide reliable thermal dimensional stability. Furthermore, a functionally layered composite structure is proposed that utilizes hardwood fibers to construct a mechanical framework, while aramid and basalt fibers constitute the surface protective layer. The interfacial bonding strength was enhanced by the calendering process. The design significantly improved the whiteness retention and increased the strength by up to 29.42%, offering a reliable technical pathway for balancing the performance of paper-based materials subjected to short-term high-temperature exposure.Keywords：Cellulose composites;Temperature-resistant paper;Thermal stability9|2|0Updated：2026-10-28
- Abstract：Volatile solid additives based on halogenated benzenes have recently emerged as pivotal components for optimizing the morphology of bulk-heterojunction (BHJ) active layers in organic solar cells (OSCs). However, the generally weak electron-withdrawing nature of halogen substituents results in restricted non-covalent interactions with the electron-deficient moieties of the acceptor. Herein, we propose a novel additive strategy involving the introduction of a non-halogenated, strongly electron-withdrawing cyano group to the benzene ring. Three cyano-functionalized halogenated benzene additives 3,5-difluorobenzonitrile (DFNB), 3,5-dichlorobenzonitrile (DCNB), and 3,5-dibromobenzonitrile (DBNB) are designed for the first time to modulate the morphology of blend films, thereby enhancing the efficiency and stability of OSCs. In contrast to the additive-free films, the additive-processed BHJ films exhibit well-defined fibrillar network structures. The introduction of these additives effectively suppressed bimolecular recombination while promoting exciton dissociation and charge transport, leading to significantly improved photovoltaic performance of the OSCs. As a result, the DCNB-processed PM6:L8-BO devices achieved a remarkable power conversion efficiency (PCE) of 19.05% versus 17.24% of the control, while also showing superior ambient storage stability, retaining 87% of the initial PCE after 1900 h, versus 75% for the control devices. This study provides a simple strategy based on cyano-functionalized halogenated benzene additives to optimize the morphology and thus improve the efficiency and stability of OSCs.Keywords：Organic solar cells;Cyano-functionalized halogenated benzenes;Volatile solid additives;Morphology optimization9|1|0Updated：2026-10-28
- Abstract：A multifunctional anticorrosion coating integrating a dynamic epoxy–poly(thioctic acid) (EP–PTA) network with chemically homologous core-shell nanocontainers was developed for magnesium alloy protection. The EP–PTA matrix was constructed via covalent coupling between epoxy groups and PTA carboxyl functionalities, forming a dense crosslinked network enriched with reversible disulfide bonds, enabling rapid intrinsic self-healing at 80 °C within 30 min. (2-(3,4-Difluorophenyl)hydrazineylidene)indolin-2-one (PHIO)-loaded zeolitic imidazolate framework-8 (ZIF-8) nanocontainers encapsulated by a poly(sodium thioctate) (PST) shell (PZS, 299.15 nm) were uniformly dispersed throughout the matrix owing to strong chemical homology, enabling pH-responsive framework degradation of ZIF-8 accompanied by a coordination-driven Mg2+–PHIO complex. Electrochemical impedance spectroscopy revealed that the PZS/EP–PTA coating maintained a low-frequency impedance modulus of 1.28×109 Ω·cm2 after 28 days of immersion in a 3.5 wt% NaCl solution, which is approximately three orders of magnitude higher than that of pristine epoxy. This superior performance originates from the synergistic integration of the nanocontainer-enhanced physical barrier, disulfide-bond-mediated dynamic network repair, and pH-triggered PHIO release with interfacial deposition. This work provides a unified design strategy that couples dynamic covalent polymer networks with chemically compatible nanocontainer systems for the durable corrosion protection of magnesium alloys.Keywords：Magnesium alloy;Corrosion resistance;Epoxy coating;Metal-organic framework (MOF);Thioctic acid;Self-healing51|50|0Updated：2026-10-23
- Abstract：Polymer-integrated covalent organic frameworks (polyCOFs) are a promising class of hybrid materials. They combine the well-ordered crystalline architectures and high porosity of conventional covalent organic frameworks (COFs) with the flexibility, processability, and mechanical robustness of the polymers. These hybrid materials are crafted by integrating polymer chains into COFs using a variety of approaches, including pre-synthetic, post-synthetic, and in-framework polymerization techniques. Such integration not only bolsters the structural stability of COFs, but also facilitates their dimensional expansion, thereby paving the way for their utilization across a broad spectrum of domains, including catalysis, energy storage, sensing, and biomedical applications. This feature article provides a comprehensive overview of the latest advancements in polyCOF synthesis, their inherent properties, and rapidly expanding applications, while also offering valuable insights into prospective avenues for further advancement of polyCOF materials.Keywords：Covalent organic frameworks (COFs);Polymers;Polymer-integrated covalent organic frameworks (polyCOFs)36|29|0Updated：2026-10-23
- Abstract：Colloidal photonic crystals (CPCs) as self-assembled microstructured materials have emerged as promising platforms for structural coloration and passive daytime cooling (PDC). However, their practical application is severely hindered by cracking propensity, and the intractable trade-off between mechanical robustness and optical performance in large-area fabrication. Herein, we report a hydrogen bond-assisted self-assembly strategy to construct waterborne polyurethane (PU)-enhanced CPC coatings that synergistically integrate crack-free scalability, vivid angle-dependent structural color, excellent mechanical stability, and efficient PDC performance. Systematic optimization reveals that incorporating 3 wt% PU establishes a homogeneous hydrogen-bonding network between PU chains and carboxyl groups on colloidal particle surfaces. This hydrogen-bonding network effectively dissipates capillary stress during evaporation self-assembly to eliminate cracking while preserving the periodic lattice structure. The resultant PU-enhanced CPC (CPC/PU) coatings exhibit full visible-spectrum structural color tunability with retained iridescence, and achieve Class 2 adhesion. Mechanical evaluations confirm the CPC/PU coatings withstand 100 fraction cycles, 2-min water flushing, 50 times bending cycles, and 6-day UV aging without structural failure and color fading. Optically, the CPC/PU coatings deliver 63% solar reflectance and 86% infrared emissivity within the atmospheric transparency window (8–13 μm), enabling an 18.9 °C reduction in surface temperature compared to bare cement under 1000 W/m2 simulated solar irradiance. Moreover, a maximum sub-ambient cooling of 6.6 °C under natural sunlight (average Isolar=538 W/m2) in outdoor field tests is achieved. The strategy offers a facile, sustainable route to multifunctional CPC coatings for decorative thermal management and building energy conservation.Keywords：Colloidal photonic crystal;Hydrogen bond;Crack-free;Passive daytime cooling19|30|0Updated：2026-10-23
- Abstract：Photothermal conversion fibers enable active solar-thermal management for personal insulation. However, solid circular architectures suffer from high thermal conductivity, excessive specular gloss, and limited bulkiness. We report melt-spun poly(lactic acid) (PLA)/cesium tungsten bronze (CsxWO3) composite fibers with systematically varied cross-sections: solid circular (F-circular), circular hollow (F-hollow), flat (F-flat), I-shaped (F-dumbbell), cross-shaped (F-cruciform), and penta-channel-shaped (F-penta-channel). The cross-sectional curvature and air-cavity content balance the photothermal conversion and thermal resistance while tuning the surface optical and capillary behavior. The F-circular fiber maximizes the near-infrared absorptance (0.72) and photothermal response (14.4 °C temperature rise under 600 W·m−2) because geometric isotropy minimizes interfacial scattering; conversely, it exhibits the lowest thermal insulation (ΔT=0.4 °C). Increasing the cross-sectional complexity progressively reduces light harvesting, as multi-ridge and flange structures amplify reflection losses at the fiber–air interface. At the same time, the F-cruciform fiber achieves the highest thermal insulation (ΔT=1.5 °C) through a four-fold symmetric air network that suppresses convective and conductive heat transfer. The shift from specular to diffuse reflection with increasing profile complexity reduces the dyeing depth (L* increases from 58 to 72) but enhances the wicking capability (F-cruciform reaches 15.6 cm). Mechanical testing showed a positive correlation between circumferential symmetry and tensile strength; geometric discontinuities in the F-flat fiber reduced the tenacity to 3.01 cN·dtex−1, but all profiled fibers remained processable for weaving and heat setting. Thus, cross-sectional geometry functions as a decisive structural parameter for balancing photothermal, thermal insulation, and comfort properties in bio-based fibers, establishing design guidelines for lightweight, fur-like sustainable thermal textiles.Keywords：Poly(lactic acid) fiber;Photothermal conversion;Thermal insulation;Cross-section engineering;Melt spinning12|10|0Updated：2026-10-23
- Abstract：The rational design of stimuli-responsive materials exhibiting tunable mechanical properties represents a critical strategy for preventing structural failure and extending service lifetime. Slide-ring polymers with their dynamically mobile crosslinks provide an ideal architectural platform for the development of mechanically adaptive systems. Herein, we fabricate photo-responsive mechanically adaptive slide-ring materials (PSR) employing azobenzene as crosslinkers. Mechanical characterization reveals substantial light-induced enhancement in performance, including breaking strain, tensile strength, and toughness. The materials subjected to photo-irradiation also demonstrate superior energy dissipation and damping efficiency. Through comprehensive mechanical characterization, we reveal a dual photoregulation mechanism in which light-induced cis-azobenzene formation (1) enhances interchain hydrogen bonding via strong local dipole moments and localized conformational rearrangements, and (2) expands the internal free volume via the steric hindrance of the cis-isomer, thereby unlocking the mobility of crown ether rings in the slide-ring architecture. This work establishes a new design principle for photoresponsive polymers, whose mechanical properties can be precisely modulated through light-controlled molecular rearrangements.Keywords：Polyrotaxanes;Mechanically interlocked structures;Photoresponsive materials;Azobenzene;Topological mobility15|5|0Updated：2026-10-23
- Abstract：Among the diverse DNA nanostructures explored for precise drug delivery, DNA tetrahedra have rapidly advanced to the forefront owing to their exceptional structural stability and highly efficient self-assembly. In contrast to conventional designs that rely on limited responsive elements, we engineered DNA tetrahedra that incorporate cytosine-rich sequences along every structural backbone. The acidic tumor microenvironment specifically triggers the stimuli-responsive full-frame disintegration of these nanocarriers. This complete structural collapse ensures the highly efficient and precise release of encapsulated antitumor drugs. Furthermore, assembling five tetrahedral units into a pentameric superstructure significantly enhanced drug payload capacity, improved cellular uptake, and maintained robust structural integrity. Systematic characterization confirmed the rapid stimulus-induced conformational transitions and selective cytotoxicity toward cancer cells. By effectively overcoming these fundamental delivery barriers, this study establishes practical design principles for the development of advanced DNA nanocarriers with higher therapeutic precision.Keywords：DNA nanocarriers;Stimuli-responsive;Conformational switching;Precision drug delivery;i-Motif16|5|0Updated：2026-10-23
- Abstract：A composition-gradient study of benzocyclobutene/polar polynorbornene dielectric films reveals that continuous low-loss network formation, rather than higher polar-group content, is critical for high-efficiency capacitive energy storage at 150–250 °C. Herein, composition-gradient B(xBCB-yP) films were prepared by blending and thermally curing divinyltetramethyldisiloxane-bis(benzocyclobutene) prepolymer (pre-DVS-BCB) with sulfone-functionalized polynorbornene prepolymer (pre-P(exo-p-sulfone)), enabling the roles of polar groups, local packing, network continuity, and charge transport to be compared. The sulfone-containing component increased the high-field effective permittivity, but intermediate blend compositions developed local packing heterogeneity, nanoscale chemical-response variation, enhanced leakage current, and reduced breakdown reliability. In contrast, B(100BCB-0P) maintained characteristic breakdown strengths of 780, 698, and 671 MV·m–1 at 150, 200, and 250 °C, respectively, and delivered maximum discharge energy densities of 5.69, 5.19, and 3.50 J·cm–3 at a charge-discharge efficiency (η) above 90%. These results indicate that high-temperature polymer dielectrics require continuous, low-loss network formation rather than simply increased polar-group content.Keywords：Polymer dielectrics;Benzocyclobutene;Polynorbornene;High-temperature capacitive energy storage28|26|0Updated：2026-10-23
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