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6760636 
Journal Article 
Synthesis of poly(styrene-co-3-trimethoxysilyl propyl methacrylate) microspheres coated with polysiloxane layer 
Lu, Xin; Xin, Z; , 
2007 
Yes 
Colloid and Polymer Science
ISSN: 0303-402X
EISSN: 1435-1536 
SPRINGER 
NEW YORK 
599-604 
WOS:000243803400016 
A procedure has been developed to coat micron-sized poly(styrene-co-3-trimethoxysilyl propyl methacrylate) microspheres with a smooth layer of polysiloxane by the hydrolysis and condensation of methyl trimethoxylsilane (MTMS). Firstly, polystyrene microspheres containing silanol groups were prepared by conventional dispersion polymerization using 3-(trimethoxysilyl) propyl methacrylate (MPS) as a functional comonomer in an ethanol/water medium. Secondly, the synthesis of the polysiloxane shell was carried out using a sol-gel process of MTMS. The thickness of the shells can be easily varied with different copolymer seeds and MTMS feed ratio. When we used copolymer particles with 2.00 mu m diameter as seeds, the thickness of the polysiloxane shells can be varied from 0.10 to 0.18 mu m. The core/shell structure of the composite microspheres was characterized by transmission electron microscope (TEM).