表面引发接枝聚合法制备高接枝度的接枝微粒SiO_2-g-PMAA  

Preparation of Grafted SiO_2-g-PMAA Particles with High Grafting Degree via a Surface-initiated Graft Polymerization Method

作　　者：李丁[1] 高保娇[1] 位霄鹏[1] 

机构地区：[1]中北大学化学工程系,太原030051

出　　处：《应用化学》2011年第2期154-158,共5页Chinese Journal of Applied Chemistry

基　　金：山西省自然科学基金资助项目(2008021013)

摘　　要：将偶联剂γ-氨丙基三甲氧基硅烷(AMPS)键合在硅胶微粒表面,得到改性微粒AMPS-SiO2;使改性微粒表面的氨基与溶液中的过硫酸铵构成氧化-还原引发体系,实现了甲基丙烯酸(MAA)在硅胶微粒的表面引发接枝聚合,制得了高接枝度(0.30 g/g)的接枝微粒SiO2-g-PMAA;研究了影响表面引发接枝聚合的主要因素。结果表明,适宜的温度为40℃。已接枝到硅胶表面的聚合物层对后续的接枝聚合产生阻隔作用。适宜的引发剂用量为单体质量的1.1%,适宜的单体质量分数为5%左右。Coupling agent γ-aminopropyltrimethoxysilane（AMPS） was firstly bond onto the surface of silica gel particles forming modified AMPS-SiO2 particles.With the presence of ammonium persulphate in the solution,a redox initiating system was then achieved and allowed the surface-initiated graft polymerization of methacrylic acid（MAA） on the silica gel particles with a high grafting degree（0.30 g/g）.The effects of different factors on the whole process were investigated in depth.The experimental results show that an optimal temperature for the surface-initiated graft polymerization system is 40 ℃.At higher temperature,the graft degree will decline due to the heat decomposition of ammonium persulphate.In addition,the grafted polymer layer hinders further polymerization.The appropriate reaction conditions are： 1.1% of the initiator and nearly 5% of the monomer concentration.

关 键 词：甲基丙烯酸 硅胶 氧化-还原引发体系 表面引发接枝聚合 接枝度 

分 类 号：O631[理学—高分子化学]