聚合物模板微球表面电性对中空二氧化硅微球形貌的影响

发布时间：2018-05-02 10:22

本文选题：中空微球 + 二氧化硅　；参考：《高分子学报》2017年05期

【摘要】：分别以过硫酸钾和偶氮二异丁基脒盐酸盐为引发剂,以聚乙烯吡咯烷酮(PVP)为分散剂,在水中引发苯乙烯聚合制备了2种表面分别带负电性和正电性基团的聚苯乙烯(PS)模板微球.在氨水催化下,利用正硅酸乙酯的水解缩合,形成PS/SiO_2复合微球,去除模板后得到中空SiO_2微球,并对其进行FTIR、电子显微镜、TGA以及氮气吸附等分析表征.结果表明,PS模板微球表面的电性决定了OH-的分布,从而导致PS模板微球表面SiO_2壳层不同的形成机制.当以表面带负电的PS微球为模板时,可得到树莓状的中空SiO_2微球;而以表面带正电的PS微球为模板时,得到是表面光滑的,具有介孔结构的中空SiO_2微球.
[Abstract]:Using potassium persulfate and diisobutamidine hydrochloride as initiators and polyvinylpyrrolidone (PVP) as dispersant, two kinds of polystyrene (PS) template microspheres with negative and positive groups on the surface were prepared by water polymerization. PS/SiO_2 composite microspheres were formed by hydrolysis and condensation of ethyl orthosilicate catalyzed by ammonia, and hollow SiO_2 microspheres were obtained after removal of templates. The microspheres were characterized by FTIR, electron microscopy and nitrogen adsorption. The results show that the electrical properties of the surface of PS template microspheres determine the distribution of OH-, which leads to different formation mechanisms of SiO_2 shell on the surface of PS template microspheres. The hollow SiO_2 microspheres with raspberry shape can be obtained when the PS microspheres with negative charge on the surface are used as templates, and the hollow SiO_2 microspheres with mesoporous structure with smooth surface are obtained when the PS microspheres with positive charge on the surface are used as templates.
【作者单位】：中国科学院软物质化学重点实验室中国科学技术大学高分子科学与工程系;
【基金】：国家自然科学基金(基金号51473152,51573174) 中央高校基本科研业务费专项资金(项目号WK2060200012,WK3450000001)资助
【分类号】：O613.72

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