接枝型天然橡胶基吸水膨胀橡胶的制备及吸水膨胀性能  

Preparation and water-swelling properties of grafted natural rubber based water-swellable rubber

作　　者：李鹏程 陈伊涵 元以中[1] 孙金煜[1] 田晓慧[1] LI Peng-cheng;CHEN Yi-han;YUAN Yi-zhong;SUN Jin-yu;TIAN Xiao-hui(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》2024年第3期228-232,共5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：以脱蛋白天然橡胶(DPNR)胶乳作为改性橡胶的基材,在氧化还原引发体系作用下,基于橡胶大分子链中烯丙基与乙烯基单体的自由基乳液接枝共聚反应实现丙烯酸(AA)在DPNR链上的接枝共聚,从而制备了一种亲水性AA接枝改性DPNR共聚物(DPNR-g-PAA),通过傅里叶变换红外光谱、核磁共振氢谱、扫描电子显微镜和称重法表征了DPNR-g-PAA的分子结构、断面形貌和吸水膨胀性能。结果表明,DPNR-g-PAA作为吸水膨胀橡胶,其薄膜吸水率可达85.06%,DPNR的表面透湿性显著提高;与传统物理共混或溶液接枝共聚反应制备吸水膨胀橡胶工艺相比,由自由基乳液接枝共聚制得的DPNR-g-PAA具有一定的优势。Deproteinized natural rubber(DPNR)latex was selected as the substrate for the modified rubber,the grafting copolymerization of acrylic acid(AA)monomer on DPNR chain was achieved and a type of hydrophilic AA modified DPNR copolymer(DPNR-g-PAA)was prepared based on the free ra-dical emulsion graft copolymerization of allyl of rubber macromolecule chain and vinyl monomer in the presence of re-dox initiating system,and the molecular structure,cross-sectional morphology,and water-swelling properties of DPNR-g-PAA were characte-rized by Fourier transform infrared spectroscopy,nuclear magnetic resonance hydrogen spectroscopy,scanning electron microscopy,and gravimetric method.The results showed that the water absorption rate of DPNR-g-PAA film as water-swellable rubber could reach 85.06%,and the surface moisture permeability of DPNR was significantly improved.Compared with the traditional process of physical blen-ding or solution grafting copolymerization,DPNR-g-PAA prepared by the free radical emulsion graft copolymerization had certain advantages.

关 键 词：脱蛋白天然橡胶胶乳 丙烯酸 吸水膨胀橡胶 接枝共聚 吸水率 吸水膨胀性能 

分 类 号：TQ331.2[化学工程—橡胶工业]