Preparation of silica/poly(methacrylic acid)/polymer tri-layer hybrid microspheres and the corresponding hollow polymer microspheres with movable silica core
作者：Hongfen Ji, Xiaoxu Wang, Xu Zhang, Xinlin Yang*
關鍵字：Tri-layer hybrid microspheres; Hollow polymer microspheres with movable core; Distillation precipitation polymerization.
論文來源：期刊
具體來源：Chin. J. Polym. Sci., 28 (5), 807-817 (2010). Chin. J. Polym. Sci., 28 (5), 807-817 (2010). DOI: 10.
發表時間：2010年
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 St?ber 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).