摘要
为了改善聚苯乙烯(PS)的耐热性能,开发兼具有机无机特性的新型凝胶材料,采用位置选择分子设计与溶胶凝胶技术,选择含有可水解形成SiO2的官能团的单体3-(甲基丙烯酰氧基)丙基三甲氧基硅烷(MSPMA)与苯乙烯(STY)共聚,利用硅烷的水解、缩聚以共价键的方式在大分子主链上引入纳米SiO2基团.通过改变单体配比合成了一系列SiO2导入位置和导入含量不同的凝胶材料.研究了共聚体的合成、水解过程和纳米SiO2基团在侧链上的分布情况以及对热性能的影响.结果表明:所得凝胶材料具有极好的光学透明性,两种单体在共聚物中几乎可以是交替进行或是按一定的比例进行聚合,形成交替"嵌段"共聚物,水解的SiO2在微纳米级且分散均匀,凝胶材料的热性能随着SiO2含量的增加而提高.
In order to improve the thermal performance of PS, a series of PS/SiOzgel materials have been pre pared by regioselection molecular mixing technology and solgel technology. First, styrene （STY） and 3 （methacryloyloxy） propyl trimethoxysilane （MSPMA） were used to synthesize the copolymer precursors via free radical copolymerization at different ratios. Second, the alkoxysilane groups in the precursors hydrolyzed and polycondensed through the solgel process. The main research results obtained are as follows： The gel materials present good optical transparency. It is found that the two monomers can form block copolymer which helps the SiO2 particle to disperse. Investigated with FTIR, the hydrolysis SiO2 particle is in micronano size and uniform ly dispersed in the polymer matrix, while the covalent bond between STY and MSPMA completely solves the problem of interface interaction, significantly improves the thermal performance of the materials. The thermal sta bility of the gel materials is remarkably enhanced with the increase of silica while the formation of silyl ester groups lessens it.
出处
《江苏科技大学学报（自然科学版）》
CAS
2012年第6期563-567,共5页
Journal of Jiangsu University of Science and Technology:Natural Science Edition
基金
江苏省研究生科研创新基金资助项目(CX07S_024z)
