Journal
JOURNAL OF POLYMER RESEARCH
Volume 14, Issue 4, Pages 253-260Publisher
SPRINGER
DOI: 10.1007/s10965-007-9104-z
Keywords
surface-initiate; atom transfer radical polymerization; silica; core-shell nanosphere
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A new kind of initiator, 3-(2-bromo-2-methylacryloxy)propyltriethysiliane (MPTS-Br), was prepared with a simply hydrobrominated commercial silane coupling agent (3-methacryloxy-proplytriethysilane, MPTS). It has been one-step self-assemble onto the surface of silica nanoparticles, and by using this initiator-modified nanoparticle (SiO2-MPTS-Br) as macroinitiator for atom transfer radical polymerization (ATRP). Structurally well-defined homopolymer polystyrene (PS) and block polymer poly (styrene-b-methyl methacrylate) (PS-b-PMMA) chains were grown from the nanoparticles surface to yield individual particles composed of silica core and thick-coated polymer shell. The graft parameters could be calculated from the elemental analysis (EA) results, and linear plots of percentage of grafting (PG%) and conversion of monomer (C%) versus polymerizing time were achieved, respectively. Narrow molecular weight distribution (M-w/M-n) for the graft polymer samples were characterized by the gel permeation chromatography (GPC). The graft polymerizations exhibited the characteristics of the controlled/living polymerization. The glass transition temperature (Tg) of SiO2-g-PS after polymerizing time of 24 h was found about 133 degrees C which was different from the polymer not grafted on the silica at 102 degrees C by the differential scanning calorimetry (DSC) analysis. The products were also characterized by FTIR, XPS and TEM. The robustness and simplicity of this method may make large-scale manufacture of these polymercoated nanospheres possible.
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