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Novel synthesis of poly(methyl methacrylate) brush encapsulated silica particles
Author(s) -
Ishizu Koji,
Lee Dong Hoon,
Tokuno Yoko,
Uchida Satoshi,
Ozawa Masaaki
Publication year - 2008
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.28510
Subject(s) - polymer chemistry , methyl methacrylate , copolymer , polystyrene , styrene , materials science , monomer , emulsion polymerization , atom transfer radical polymerization , radical polymerization , methacrylate , particle size , chemical engineering , polymer , composite material , engineering
Silica (SiO 2 )‐crosslinked polystyrene (PS) particles possessing photofunctional N,N ‐diethyldithiocarbamate (DC) groups on their surface were prepared by the free‐radical emulsion copolymerization of a mixture of SiO 2 (diameter = 20 nm), styrene, divinyl benzene, 4‐vinylbenzyl N,N ‐diethyldithiocarbamate (VBDC), and 2‐hydroxyethyl methacrylate with a radical initiator under UV irradiation. In this copolymerization, the inimer VBDC had the formation of a hyperbranched structure by a living radical mechanism. The particle sizes of such core–shell structures [number‐average particle diameter ( D n ) = 35–40 nm] were controlled by the variation of the feed amounts of the monomers and surfactant, or emulsion system. The size distributions were relatively narrow (weight‐average particle diameter/ D n ≈ 1.05). These particles had DC groups on their surface. Subsequently, poly(methyl methacrylate) brush encapsulated SiO 2 particles were synthesized by the grafting from a photoinduced atom transfer radical polymerization approach of methyl methacrylate initiated by SiO 2 ‐crosslinked PS particles as a macroinitiator. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008