Preparation of core–shell coagulates by hydrophobic heterocoagulation of micron-sized poly(methyl methacrylate) and submicron-sized poly(styrene) particles

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• 作者：Tatsuo Taniguchi ; Tatsuya Ogawa ; Yoshitada Kamata ; Shotaro Kobaru ; Naoki Takeuchi ; Michinari Kohri ; Takayuki Nakahira ; Takeshi Wakiya
• 关键词：Core– ; shell ; Heterocoagulates ; Glass transition temperature ; Fluorescence resonance energy transfer
• 刊名：Colloids and Surfaces A: Physicochemical and Engineering Aspects
• 出版年：2010
• 出版时间：5 March 2010
• 年：2010
• 卷：356
• 期：1-3
• 页码：169-175
• 全文大小：916 K

文摘

Core–shell coagulates were prepared by hydrophobic heterocoagulation between non-charged poly(methyl methacrylate) (PMMA) core and cationically charged polystyrene (PSt) shell particles. Addition of NaCl and elevation of coagulation temperature to the vicinity of the glass transition temperature (T_g) of the shell particles are found to be keys to successful heterocoagulation. Fluorescence resonance energy transfer (FRET) experiments using pyrene-labeled core and naphthalene-labeled shell particles showed that interdiffusion of the polymer chains at the interface between the core and shell particles is most effective when coagulates were prepared at or slightly above the T_gs of both core and shell particles.