Abstract:

A series of organic polymer-inorganic hybrid materials, zinc poly(styrene-phenylvinyl phosphonate)-phosphate ammonium(ZnPS-PVPPA), was prepared with mild and facile conditions from the copolymer of styrene-phenylvinyl phosphonic acid with zinc acetate dihydrate and ammonium dihydrogen phosphate treated with different ratios of inorganic phosphate to organic phosphonate. The structures of ZnPS-PVPPA were characterized by FTIR, TG, XRD, SEM and TEM and their catalytic abilities were also tested. It could be deduced that the compounds were novel types of layered crystalline organic polymer-inorganic hybrid materials and possessed high thermal stability and porous structure. The heterogeneous catalysts were synthesized to catalyze the asymmetric epoxidation of unfunctional olefins via ZnPS-PVPPA as supports, aryldiamines as linkers and axial coordinating with Salen Mn(Ⅲ). The catalytic results indicated that the superior catalytic abilities were obtained in the asymmetric epoxidation of α-methylstyrene and indene with m-CPBA/NMO as oxidant, such as up to 99% e.e. according to indene. Meanwhile, the supported catalysts could be reused and still display fine catalytic abilities after recycled 8 times and have potential applications for industry.

Key words: Copolymer of styrene-phenylvinyl phosphonic acid, Zinc poly(styrene-phenylvinyl phosphonate)-phosphate ammonium, Layered crystalline, Porous structure, Catalyst support