论文部分内容阅读
Mesoporous titania-grafted poly(styrene-divinylbenzene)/maleic anhydride [P(St-DVB)/MA] nanocomposite microspheres were prepared by an open ring reaction method.The titania nanoparticles were first modified by attachment of amino groups to their surface to prevent particle aggregation,and to allow the nanoparticles to covalently bond the polymer microspheres,the surface of which was modified by attachment of MA functional groups to enable the polymer to retain their porous structures and to react with the amino groups on the surface of the titania particles.The porous nanocomposite microspheres were detected by FTIR,SEM,TEM,XRD and UV-Vis spectrophotometry.The results indicated that the nanocomposite microspheres were composed of nanosized titania uniformly distributed on the surface,and exhibited better UV absorbing property than pure polymer microspheres or unmodified titania.Furthermore,compared with pure porous polymer microspheres,the nanocomposite microspheres showed more efficient UV protection and slow release of Parsol-1789(a photo-reactive and cosmetic agent) held inside the porous network of the microspheres.
Mesoporous titania-grafted poly (styrene-divinylbenzene) / maleic anhydride [P (St-DVB) / MA] nanocomposite microspheres were prepared by an open ring reaction method.The titania nanoparticles were first modified by attachment of amino groups to their surface to prevent particle aggregation, and to allow the nanoparticles to covalently bond the polymer microspheres, the surface of which was modified by attachment of MA functional groups to enable the polymer to retain their porous structures and to react with the amino groups on the surface of the titania particles The porous nanocomposite microspheres were detected by FTIR, SEM, TEM, XRD and UV-Vis spectrophotometry. The results indicated that the nanocomposite microspheres were composed of nanosized titania uniformly distributed on the surface, and loaded better UV absorbing properties than pure polymer microspheres or unmodified titania.Furthermore, compared with pure porous polymer microspheres, the nanocomposite microspheres showed more efficie nt UV protection and slow release of Parsol-1789 (a photo-reactive and cosmetic agent) held inside the porous network of the microspheres.