Effect of Cross-Linking Density of Powdered Rubber on Gas Barrier Property and CO_(2)Permselectivity of NR/BR Composites  

作　　者：Peng-Cheng Xia Hua-Feng Shao Ai-Hua He 

机构地区：[1]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

出　　处：《Chinese Journal of Polymer Science》2025年第1期199-210,I0013,共13页高分子科学(英文版)

基　　金：supported by the National Key Research and Development Program of China(No.2022YFB3704700(2022YFB3704702));the National Nature Science Foundation of China(No.52473096);Major Scientific and Technological Innovation Project of Shandong Province(No.2021CXGC010901);Taishan Scholar Program.

摘　　要：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/pVTPR 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,PN2=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)/N2 selectivity of 61.4 and a CO_(2)/O_(2)selectivity of 26.12.This innovation provides a nove

关 键 词：Gas barrier CO_(2)separation Cross-linking density Powdered rubber Inner liner 

分 类 号：TB3[一般工业技术—材料科学与工程]