FOLLOWUS
Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Rubber-Plastics (Ministry of Education)/ Shandong Provincial Key Laboratory of Rubber-plastics, Qingdao University of Science and Technology, Qingdao 266042, China
shaohf0826@msn.com (H.F.S.)
aihuahe@iccas.ac.cn (A.H.H.)
Received:16 August 2024,
Revised:13 September 2024,
Accepted:2024-09-16,
Published Online:14 November 2024,
Published:01 January 2025
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Xia, P. C.; Shao, H. F.; He, A. H. Effect of cross-linking density of powdered rubber on gas barrier property and CO2 permselectivity of NR/BR composites. Chinese J. Polym. Sci. 2025, 43, 199–210
Peng-Cheng Xia, Hua-Feng Shao, Ai-Hua He. Effect of Cross-Linking Density of Powdered Rubber on Gas Barrier Property and CO2 Permselectivity of NR/BR Composites[J]. Chinese journal of polymer science, 2025, 43(1): 199-210.
Xia, P. C.; Shao, H. F.; He, A. H. Effect of cross-linking density of powdered rubber on gas barrier property and CO2 permselectivity of NR/BR composites. Chinese J. Polym. Sci. 2025, 43, 199–210 DOI: 10.1007/s10118-024-3238-x.
Peng-Cheng Xia, Hua-Feng Shao, Ai-Hua He. Effect of Cross-Linking Density of Powdered Rubber on Gas Barrier Property and CO2 Permselectivity of NR/BR Composites[J]. Chinese journal of polymer science, 2025, 43(1): 199-210. DOI: 10.1007/s10118-024-3238-x.
The uniformly dispersed pVTPR acts as a filler in the rubber matrix and greatly extends the path of N
2
and O
2
through the composites
which gives the composites excellent gas barrier properties. As the pVTPR cross-linking density increased
the gas-barrier properties of the composites gra
dually improved.
In this study
a novel cost-effective methodology was developed to enhance the gas barrier properties and permselectivity of unfilled natural rubber (NR)/polybutadiene rubber (BR) composites through the construction of a heterogeneous structure using pre-vulcanized powder rubber to replace traditional fillers. The matrix material is composed of a blend of NR and BR
which is widely used in tire manufacturing. By incorporating pre-vulcanized
trans
-1
4-poly(isoprene-
co
-butadiene) (TBIR) rubber powder (pVTPR) with different cross-linking densities and contents
significant improvements in the gas barrier properties and CO
2
permselectivity of the NR/BR/pVTPR composites were observed. The results indicated that compared to NR/BR/TBIR composites prepared through direct blending of NR
BR
and TBIR
the NR/BR/pVTPR composites exhibited markedly superior gas barrier properties. Increasing the cross-linking density of pVTPR resulted in progressive enhancement of the gas barrier properties of the NR/BR/pV
TPR composite. For example
the addition of 20 phr pVTPR with a cross-linking density of 346 mol/m
3
resulted in a 79% improvement in the oxygen barrier property of NR/BR/pVTPR compared to NR/BR
achieving a value of 5.47×10
−14
cm
3
·cm·cm
−2
·s
−1
·Pa
−1
. Similarly
the nitrogen barrier property improved by 76% compared to NR/BR
reaching 2.4×10
−14
cm
3
·cm·cm
−2
·s
−1
·Pa
−1
which is 28 % higher than the conventional inner liner material brominated butyl rubber (BIIR
P
N2
=3.32×10
−14
cm
3
·cm·cm
−2
·s
−1
·Pa
−1
). Owing to its low cost
exceptional gas barrier properties
superior adhesion to various tire components
and co-vulcanization capabilities
the NR/BR/pVTPR composite has emerged as a promising alternative to butyl rubber in the inner liner of tires. Furthermore
by fine-tuning the cross-linking density of pVTPR
the high-gas-barrier NR/BR/pVTPR composites also demonstrated remarkable CO
2
permselectivity
with a CO
2
/N
2
selectivity of 61.4 and a CO
2
/O
2
selectivity of 26.12. This innovation provides a novel strategy for CO
2
capture and separation
with potential applications in future environmental and industrial processes. The multifunctional NR/BR/pVTPR composite
with its superior gas barrier properties and CO
2
permselectivity
is expected to contribute to the development of safer
greener
and more cost-effective transportation solutions.
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