用丙烯腈接枝改性脱蛋白天然胶乳及其自修复性能  

Graft modification of deproteinized natural rubber latex with acrylonitrile and its self-healing property

作　　者：杨玥 田晓慧[1] 孙金煜[1] 元以中[1] YANG Yue;TIAN Xiao-hui;SUN Jin-yu;YUAN Yi-zhong(School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《合成橡胶工业》2023年第4期297-303,共7页China Synthetic Rubber Industry

基　　金：中央高校基本科研业务费资助项目(22A201514002)。

摘　　要：采用乳液接枝共聚法,以脱蛋白天然橡胶(DPNR)为基体,丙烯腈(AN)和丙烯酸(AA)为单体,在叔丁基过氧化氢/四乙烯五胺引发体系下,合成了DPNR接枝AN和AA共聚物[DPNR-g-P(AN-coAA)]。通过红外光谱、核磁共振波谱等验证了AN及AA单体的接枝,研究了单体总量及m(AN)/m(AA)对改性DPNR力学性能的影响,以及修复条件对其自修复性能的影响。结果表明,在单体总量为10份(以干胶质量计)、m(AN)/m(AA)为10/1的条件下,DPNR-g-P(AN-co-AA)的最大拉伸强度和扯断伸长率分别为9.22 MPa和1365%,分别是初始DPNR的376%和133%。此外,体系中聚丙烯酸链段间的氢键相互作用使得DPNR-g-P(AN-co-AA)兼具优异的自修复性能,在50℃时愈合2 h可达到75.3%的自修复效率。The copolymer of deproteinized natural rubber(DPNR)grafted acrylonitrile(AN)and acrylic acid(AA)[DPNR-g-P(AN-co-AA)]was synthesized by emulsion grafting copolymerization,using DPNR as matrix,AN and AA as monomers in the initiation system of tert-butyl hydroperoxide and tetra-ethylenepentamine.The grafting of AN and AA monomers was verified by infrared spectroscopy and nuclear magnetic resonance spectroscopy,and the effects of total monomer amount and m(AN)/m(AA)on the mechanical properties of modified DPNR were studied,as well as the effect of healing conditions on its self-healing property.The results showed that under the conditions of a total monomer amount of 10 phr(in terms of dry rubber mass)and m(AN)/m(AA)of 10/1,the maximum tensile strength and elongation at break of DPNR-g-P(AN-co-AA)were 9.22 MPa and 1365%,respectively,which were 376% and 133% of the initial DPNR.In addition,the hydrogen bond interaction between polyacrylic acid segments in the system enabled DPNR-g-P(AN-co-AA)to have excellent self-healing property,reaching a self-healing efficiency of 75.3% after 2 h at 50℃.

关 键 词：脱蛋白天然橡胶 丙烯腈 丙烯酸 乳液接枝共聚 力学性能 氢键自修复 

分 类 号：TQ332.5[化学工程—橡胶工业]