Promoted Comprehensive Properties of Polyisoprene Rubber with Extremely High Fatigue Resistance Enabled by Oligopeptide Aggregates

Yu He; Ran Xu; Rong Zhang; Chang-Cheng Wang; Shi-Qi Li; Jian Cao; Mao-Zhu Tang; Yun-Xiang Xu

doi:10.1007/s10118-023-2933-3

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Promoted Comprehensive Properties of Polyisoprene Rubber with Extremely High Fatigue Resistance Enabled by Oligopeptide Aggregates

RESEARCH ARTICLE | Updated：2023-07-18

- Promoted Comprehensive Properties of Polyisoprene Rubber with Extremely High Fatigue Resistance Enabled by Oligopeptide Aggregates
- Chinese Journal of Polymer Science Vol. 41, Issue 8, Pages: 1250-1260(2023)
- Affiliations：
  
  1.College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
- Author bio：
  
  mztang@scu.edu.cn (M.Z.T.)
  yxxu@scu.edu.cn (Y.X.X.)
- Funds：
- DOI：10.1007/s10118-023-2933-3
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Yu He, Ran Xu, Rong Zhang, et al. Promoted Comprehensive Properties of Polyisoprene Rubber with Extremely High Fatigue Resistance Enabled by Oligopeptide Aggregates. [J]. Chinese Journal of Polymer Science 41(8):1250-1260(2023)
DOI：

Yu He, Ran Xu, Rong Zhang, et al. Promoted Comprehensive Properties of Polyisoprene Rubber with Extremely High Fatigue Resistance Enabled by Oligopeptide Aggregates. [J]. Chinese Journal of Polymer Science 41(8):1250-1260(2023) DOI： 10.1007/s10118-023-2933-3.

摘要

Abstract

For decades, the preparation of polyisoprene rubber that can match the comprehensive properties of natural rubber (NR) has been pursued. While sacrificial bonds have been used to promote the strength and toughness of rubbers, little is known about their effects on fatigue resistance, which is important in dynamic environments. Herein, terminal block and randomly functionalized polyisoprene rubbers tethered with di-alanine, tri-alanine and tetra-alanine were prepared. The results showed that the flow activation energy, aggregates ordering and energy dissipation of the hydrogen-bonded aggregates increase with the elongation of oligopeptide length (,X,A,X,=2, 3, 4), therefore resulting in enhanced mechanical strength and toughness of corresponding samples. Comparably, the tear strengths are barely affected by oligopeptide lengths in block samples, but promoted from dipeptide to tetrapeptide in random samples, probably due to the well dispersed oligopeptide aggregates. Most importantly, it is found that the tight binding aggregates of oligopeptides are critical for the excellent fatigue resistance, which is absent in polyisoprene and natural rubber. The loose aggregates dissociate and recombine repeatedly under cyclic loading and the tight aggregates keep the network integrated and robust. Interestingly, the largest hysteresis of PIP-4A-V with the longest oligopeptide length give the lowest heat generation, which is contrary to the traditional sacrificial bonds. Overall, the oligopeptide aggregates have repeatable energy dissipation properties and cycle life comparable to or even surpassing those of the linked proteins in NR, resulting in similar tensile strength, fracture toughness, and better fatigue resistance relative to NR. This deep insight on the role of oligopeptide aggregates is very useful for the engineering rubbers served in dynamic environments.

关键词

Keywords

PolyisopreneHydrogen bondingOligopeptidesFatigue resistance

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