硅溶胶复合阳离子硅橡胶乳液的制备与性能  

Preparation and Properties of Cationic Silicone Rubber-Modified Silica Sol Emulsion

作　　者：翟俊菱 沈敏敏[1] 孙淳宁 王俊凤[1,2] 哈成勇[1] 

机构地区：[1]中国科学院广州化学研究所纤维素化学重点实验室,广东广州510650 [2]中国科学院大学,北京100039

出　　处：《高分子材料科学与工程》2015年第8期43-49,共7页Polymer Materials Science & Engineering

摘　　要：采用八甲基环四硅氧烷(D4)阳离子乳液开环聚合制备了端羟基聚硅氧烷(PDMS)乳液,加入偶联剂正硅酸乙酯(TEOS)和增强剂硅溶胶(Silica sol)制备了硅溶胶复合硅橡胶乳液,并制膜。通过凝胶渗透色谱和核磁共振分析表征了PDMS相对分子质量及分布,结果表明,PDMS的珚Mn为27000,相对分子质量分布为1.35。研究了TEOS、硅溶胶用量对乳液粒径及分布、复合膜力学性能、交联密度的影响,通过透射电镜、扫描电镜分别对乳液及复合膜微观形貌进行了观察。结果表明,随TEOS、硅溶胶用量增加,乳液粒径增大,粒径分布变宽,复合膜拉伸强度和邵氏硬度逐渐增大,断裂伸长率减小,交联密度增大。当w(TEOS)=2.0%,w(Silica sol)=20%时,硅橡胶乳液综合性能达到最佳。The polydimethylsiloxane（ PDMS） was first prepared by cationic emulsion polymerization,which was further used to form a silicone rubber-modified silica sol emulsion using tetraethoxysilane（ TEOS） as coupling agent and silica sol as reinforcing agent.1H-NMR and GPC analysis of the synthesized PDMS show that the average molecular weight is around 27000 and polydispersity index is 1. 35. The microstructure of the silicone rubber emulsion was further characterized by TEM. The morphology of composite films was analyzed by SEM. Besides,the effects of usages of TEOS and silica sol on particle sizes and particle size distributions of the emulsion were also investigated,as well as the mechanical properties and crosslinking density of the composite films. The results show that as increasing content of TEOS and silica sol,the latex particle and wider particle size distribution of emulsion increase with,as well as an enhancing tense strength,Shore-A hardness,and decreasing broken elongation ratio of the films. The optimum to obtain the silicone rubber-modified silica sol emulsion with comprehensive performance is at the content ratio of w（ TEOS） = 2. 0%,w（ silica sol） = 20%.

关 键 词：八甲基环四硅氧烷 阳离子乳液 硅橡胶 硅溶胶 粒径 交联密度 

分 类 号：TQ333.93[化学工程—橡胶工业]