Silica-Polymethacrylate Hybrid Particles Synthesized Using High-Pressure Atom Transfer Radical Polymerization (pages 295–301)
Joanna Pietrasik, Chin Ming Hui, Wojciech Chaladaj, Hongchen Dong, Jihoon Choi, Janusz Jurczak, Michael R. Bockstaller and Krzysztof Matyjaszewski
Article first published online: 9 NOV 2010 | DOI: 10.1002/marc.201000531
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 (6 kbar). High pressure enabled relatively fast synthesis of those materials due to enhanced propagation rate constant and reduced termination rate constant for polymerizations conducted under high pressure. Molecular weights of grafted chains greater than 1 million were obtained. The molecular weights of polymers attached to particles are the highest reported to date.