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oai:kumadai.repo.nii.ac.jp:00024913 2023-08-30T02:59:04Z 426:428

Thixotropic interparticle interaction between silica and nonionic polymer particles prepared by static dispersion polymerization 川野, 真太郎 瀬井, 亜澄 國武, 雅司 Kawano, Shintaro Sei, Asumi 國武, 雅司 クニタケ, マサシ Kunitake, Masashi 國武 クニタケ Kunitake 雅司 マサシ Masashi © 2011 Elsevier Ltd. 431.9 Silica particles Static dispersion polymerization Polystyrene particles application/pdf 論文(Article) Static dispersion polymerization of styrene, methyl methacrylate, ethyl methacrylate, butyl methacrylate and benzyl methacrylate, initiated by a lipophilic initiator in an aqueous dispersion with unmodified silica particles was investigated. Polymerization of styrene gave a mixed dispersion of silica and monodisperse polystyrene (PS) particles, which was extremely stable compared with the aqueous dispersion of silica particles. The enhanced dispersion stability is due to a thixotropic effect based on weak attractive interparticle interactions between silica and PS particles in aqueous dispersion. An aggregate in which silica particles are surrounded by the smaller PS particles is formed and inhibits flocculation of silica particles, thus giving enhanced dispersion stability. The results of similar static polymerization reactions with methacrylate analogs indicate that hydrogen bonds between benzene ring and hydroxy groups on the silica surface, and not electrostatic interaction derived from initiator residues, are the origin of weak interaction for thixotropic aggregation. http://www.sciencedirect.com/science/article/pii/S0032386111000905 Elsevier 2011-03-23 eng journal article AM http://hdl.handle.net/2298/20580 https://kumadai.repo.nii.ac.jp/records/24913 10.1016/j.polymer.2011.01.056 00323861 Polymer 52 7 1577 1588 https://kumadai.repo.nii.ac.jp/record/24913/files/Polymer_52_7_1577-1588.pdf application/pdf 2.0 MB 2020-03-02