A novel method of surface-initiate atom transfer radical polymerization of styrene from silica nanoparticles for preparation of monodispersed core-shell hybrid nanospheres

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...

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Bibliographic Details
Published in:Journal of polymer research 2007-08, Vol.14 (4), p.253-260
Main Authors: Zhang, Hong, Lei, Xiping, Su, Zhixing, Liu, Peng
Format: Article
Language:English
Subjects:
Analysis
Block copolymers
Chemical analysis
Coupling (molecular)
Coupling agents
Differential scanning calorimetry
Glass
Glass transition temperature
Graft copolymers
Grafting
Initiators
Liquid chromatography
Methods
Methyl methacrylate
Molecular weight
Molecular weight distribution
Nanoparticles
Nanospheres
Polymer coatings
Polymerization
Polymers
Polymethyl methacrylate
Polystyrene resins
Radicals
Silica
Silicon dioxide
Styrenes
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Summary: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 (SiO.sub.2-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.sub.w/M.sub.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 (T.sub.g) of SiO.sub.2-g-PS after polymerizing time of 24 h was found about 133 °C which was different from the polymer not grafted on the silica at 102 °C by the differential scanning calorimetry (DSC) analysis. The products were also characterized by FT-IR, XPS and TEM. The robustness and simplicity of this method may make large-scale manufacture of these polymer-coated nanospheres possible.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-007-9104-z