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Silica‐Polymethacrylate Hybrid Particles Synthesized Using High‐Pressure Atom Transfer Radical Polymerization
Author(s) -
Pietrasik Joanna,
Hui Chin Ming,
Chaladaj Wojciech,
Dong Hongchen,
Choi Jihoon,
Jurczak Janusz,
Bockstaller Michael R.,
Matyjaszewski Krzysztof
Publication year - 2011
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201000531
Subject(s) - atom transfer radical polymerization , polymerization , materials science , polymer chemistry , chain transfer , radical polymerization , methyl methacrylate , methacrylate , chemical engineering , polymer , composite material , engineering
Hybrid nanoparticles with a silica core and grafted poly(methyl methacrylate) (PMMA) or poly( n ‐butyl methacrylate) (PBMA) chains were prepared via activators generated by electron transfer for atom transfer radical polymerization (AGET ATRP) at room temperature under high pressure. Due to enhanced propagation rate constant and reduced termination rate constant for polymerizations conducted under high pressure, the rate of polymerization was increased, while preserving good control over polymerization when compared to ATRP under ambient pressure. Molecular weights of greater than 1 million were obtained. The PMMA and PBMA brushes exhibited “semi‐diluted” or “diluted” brush architecture with the highest grafting densities ≈0.3 chain·nm −2 .