摘要
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 Stober 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）.
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 Stober 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）.
基金
supported by the National Natural Science Foundation of China(No.20874049).
