Citation: Hong-fen Ji, Xiao-xu Wang, Xu Zhang, Xin-lin Yang. PREPARATION OF SILICA/POLY(METHACRYLIC ACID)/POLY(DIVINYLBENZENE-CO-METHACRYLIC ACID) TRI-LAYER MICROSPHERES AND THE CORRESPONDING HOLLOW POLYMER MICROSPHERES WITH MOVABLE SILICA CORE[J]. Chinese Journal of Polymer Science, ;2010, 28(5): 807-817. doi: 10.1007/s10118-010-9164-0 shu

PREPARATION OF SILICA/POLY(METHACRYLIC ACID)/POLY(DIVINYLBENZENE-CO-METHACRYLIC ACID) TRI-LAYER MICROSPHERES AND THE CORRESPONDING HOLLOW POLYMER MICROSPHERES WITH MOVABLE SILICA CORE

Received Date: 3 November 2009
Revised Date: 18 December 2009

Hollow poly(divinylbenzene-co-methacrylic acid) (P(DVB-co-MAA)) microspheres were prepared by the selective dissolution of the non-crosslinked poly(methacrylic acid) (PMAA) mid-layer in ethanol from the corresponding silica/PMAA/P(DVB-co-MAA) tri-layer hybrid microspheres, which were afforded by a three-stage reaction. Silica/PMAA core-shell hybrid microspheres were prepared by the second-stage distillation polymerization of methacrylic acid (MAA) via the capture of the oligomers and monomers with the aid of the vinyl groups on the surface of 3-(methacryloxy)propyl trimethoxysilane (MPS)-modified silica core, which was prepared by the Stber hydrolysis as the first stage reaction. The tri-layer hybrid microspheres were synthesized by the third-stage distillation precipitation copolymerization of functional MAA monomer and divinylbenzene (DVB) crosslinker in presence of silica/PMAA particles as seeds, in which the efficient hydrogen-bonding interaction between the carboxylic acid groups played as a driving force for the construction of monodisperse hybrid microspheres with tri-layer structure. The morphology and the structure of silica core, silica/PMAA core-shell particles, the tri-layer hybrid microspheres and the corresponding hollow polymer microspheres with movable silica cores were characterized by transmission electron microscopy (TEM), Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy (XPS).
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