纳米孔硅气凝胶/聚苯乙烯核壳材料合成制备

摘要

为获得纳米孔超级绝热复合材料,采用硅烷偶联剂对原位生成的纳米孔硅气凝胶进行表面处理,通过分散聚合工艺制备出聚苯乙烯接枝包覆硅气凝胶的纳米核壳结构复合材料.通过电子显微镜(TEM)对上述纳米样品进行了表征,并就体系组分、引发剂、聚合参数和分散工艺的影响进行了讨论.结果表明:体系组分中对转化率影响最大的是硅气凝胶与苯乙烯的质量比;以有机类偶氮二异丁腈(AIBN)为引发剂,经独特的超声工艺处理,获得包覆率达70%的核壳结构复合材料.%In order to obtain nano-hole super heat insulating composite materials, with silane coupling agent on the in-situ nmSiO2 surface treatment, the core-shell structure composite materials are prepared by dispersion polymerization process of polystyrene grafted on the nano SiO2 particles. By TEM on these samples,the impact of the system components,initiator, polymerization parameters and dispersion process is discussed. The results show that the system component of the greatest impact on conversion rate is the radio of SiO2 aerogels/St, with organic initiator AIBN as initiator, after a unique ultrasound technique the core-shell composite materials structure with 70％ coating can be obtained. 2 tabs, 3 figs, 9 refs.