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Preparation of poly(methyl methacrylate)/titanium oxide composite particles via in‐situ emulsion polymerization
Author(s) -
Yang Mingjiao,
Dan Yi
Publication year - 2006
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.23223
Subject(s) - materials science , thermogravimetric analysis , methyl methacrylate , emulsion polymerization , grafting , polymerization , composite number , polymer chemistry , chemical engineering , poly(methyl methacrylate) , fourier transform infrared spectroscopy , monomer , polymer , silane , methacrylate , composite material , engineering
Poly(methyl methacrylate) (PMMA)/Titanium oxide (TiO 2 ) composite particles were prepared via in‐situ emulsion polymerization of MMA in the presence of TiO 2 particles. Before polymerization, the TiO 2 particles was modified by the silane coupling agent, which is crucial to ensure that PMMA reacts with TiO 2 via covalent bond bindings. The structure of the obtained PMMA/TiO 2 composite particles was characterized using Fourier transform infrared spectra (FTIR) and thermogravimetric analysis (TGA). The results indicate that there are covalent bond bindings between PMMA macromolecules and TiO 2 particles. Based on these facts, several factors affecting the resulting PMMA/TiO 2 composite system, such as the type of coupling agents, the mass ratio of the MMA to the modified TiO 2 , the emulsifier concentration, and the initiator concentration, etc., were examined by the measurement of conversion of monomers, the gel content of polymers, the percentage of grafting, and the grafting efficiency, using gravity method or TGA method. As a result, the optimized recipe was achieved, and the percentage of grafting and the grafting efficiency could reach 216.86 and 96.64%, respectively. In addition, the obtained PMMA/TiO 2 composite particles were found to a stable colloidal dispersion in good solvent for PMMA. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 4056–4063, 2006