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Controllable synthesis of raspberry-like PS-SiO2 nanocomposite particles via Pickering emulsion polymerization
Xiaotian Zhang1, Yangyi Sun1, Yijing Mao1
1Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Engineering Research Center for Eco-Dyeing & Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University Hangzhou 310018 China yangyisun@zstu.edu.cn zhcao@zstu.edu.cn dongmingqi@zstu.edu.cn.
Abstract:
This paper presents a simple and controllable method for the synthesis of monodisperse nanometer-sized organic-inorganic raspberry-like polystyrene (PS)-SiO2 nanocomposite particles (NCPs) via Pickering emulsion polymerization, by simply using a silane coupling agent, 3-(trimethoxysilyl)propyl methacrylate (MPS), as an auxiliary monomer and controlling its hydrolysis/condensation processes and amount. In this method, when MPS was stirred in acidic water with styrene (St) for a period of time, and then a basic silica solution added, raspberry-like PS-SiO2 NCPs were directly obtained after the polymerization. The whole process needs neither surface treatment for the silica particles nor additional surfactants or stabilizers. We propose that a silica-stabilized Pickering emulsion is formed through Si-OH reaction between the hydrolysis/condensation products of MPS distributed on the St droplets surface and the silica particles.
