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钛酸四丁酯水解制备聚苯乙烯/二氧化钛核壳粒子及空心二氧化钛微球

DOI: 10.3724/SP.J.1105.2011.10257, PP. 778-783

Keywords: 聚苯乙烯乳胶粒,KH550表面改性,核壳复合粒子,TiO2空心粒子

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Abstract:

通过无皂乳液聚合方法制备了阳离子型及阴离子型聚苯乙烯(PSt)乳胶粒,并对后者用γ-氨丙基三乙氧基硅烷(KH550)进行了表面改性制得了乳胶粒表面载正电荷的乳液.在乙醇与水的混合溶剂中,分别使用以上3种PSt乳胶粒为核加入钛酸四丁酯制备了核壳型PSt/TiO2复合粒子.结果显示,仅在使用经KH550改性的阴离子PSt乳胶粒时可以得到外壳包覆有致密均匀的TiO2层的核壳结构的复合乳胶粒.该复合粒子经四氢呋喃溶解可以得到结构清晰的TiO2空心粒子.还对KH550对乳胶粒的处理时间及其用量、钛酸四丁酯用量等因素对空心粒子的形成及其形貌的影响进行了分析.

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