Preparation of Hybrid Nanocapsules |
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Authors: | K. Ni E. Bourgeat-Lami N. Sheibat-Othman G. Shan G. Fevotte |
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Affiliation: | 1. State Key Laboratory of Polymerization Reaction Engineering, Department of Chemical Engineering, Zhejiang University, Hangzhou 310027, China;2. Chimie Catalyse Polymères Procédés (C2P2) - Equipe Chimie et Procédés de Polymérisation (LCPP) - UMR 5265 CNRS/ ESCPE – UCBL, Bât. Villeurbanne, France;3. Laboratoire d'Automatique et de Génie des Procédés, UMR 5007 CNRS/Université Claude Bernard Lyon 1 – ESCPE, Villeurbanne, France |
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Abstract: | Hybrid nanoparticles with a polystyrene core and a hybrid copolymer shell were used to produce hybrid nanocapsules by dissolving the polystyrene core from the previously elaborated core-shell particles. Following previous works, the core-shell particles were prepared by emulsion polymerization of styrene and subsequent addition of γ-methacryloxy propyl trimethoxy silane (MPS) to produce the shell by copolymerization reaction of MPS with the residual styrene. Core extraction was performed by diluting the core-shell particles in an excess of tetrahydrofuran (THF). Two procedures were investigated to separate the dissolved polymer chains from the nanocapsules. In the first procedure, the polymer was isolated by successive centrifugation and redispersion in THF, whereas in the second procedure, the free polymer chains were removed by dialysis. The polymer molecular weight was optimized in order to promote dissolution of the polymer chains and allow them to diffuse through the shell. |
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Keywords: | core-shell polymers diffusion hybrid nanocapsules emulsion polymerization sol-gel |
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