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OALib Journal期刊
ISSN: 2333-9721
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pH值和前驱体用量对核壳结构PSt/SiO2复合微球结构形态的影响
DOI: 10.3724/SP.J.1105.2011.10078, PP. 307-312
Keywords: PSt/SiO2复合微球,表面改性,形态,前驱体,pH
Abstract:
首先通过无皂乳液聚合法制得表面含羧基、粒径为360nm的单分散聚苯乙烯（PSt）种子乳液，并在EtOH/H2O混合介质中用γ氨丙基三乙氧基硅烷（KH-550）对其进行改性，制得表面含有活性硅乙氧基并带有正电荷的改性PSt乳胶粒，然后再加入原硅酸乙酯（TEOS）进行共水解与共缩聚反应，制备出了核壳结构PSt/SiO2复合微球.系统研究了聚合体系pH和前驱体TEOS用量对复合微球结构形态的影响.研究表明，对于改性PSt乳胶粒和TEOS反应体系，只有在碱性条件下才能制备出具有核壳结构的PSt/SiO2复合微球，当pH值为8.5时，可得到包覆完整、SiO2壳层厚度均一的核壳结构PSt/SiO2复合微球，此后随着体系pH值的升高，被部分包覆复合微球的比例增加；固定PSt种子乳胶粒的用量为1.5g，随着TEOS用量从2.5g增加到15g，复合微球壳层厚度从17nm逐渐增加到68nm，微球表面也逐渐变得粗糙.
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