Preparation And Characteristic Study Of Ordered Polymer/inorganic Composites

Ordered silica (SiO2) and polystyrene (PS) templates composed of monodispersed spheres were prepared by self-assemble proceeding. Chemical modification of PS templates result in the novel ordered hydrogels and core/shell hydrogels, which are further used as templates to produce a new kind of sensitive composite hydrogels, i.e. poly (acrylic acid sodium)/poly(acrylamide)/sPS copolymer hydrogel. By using the silica template, the composite of syndiotactic polystyrene (sPS)/ SiO2 and corresponding ordered macroporous sPS were prepared.Hard and ordered polystyrene colloidal crystals were obtained by ambient drying the monodisperse polystyrene latexes. Polystyrene colloidal crystals were chemical modified by controlled sulfonation with concentrated sulfuric acid to derive the novel ordered hydrogels including ordered hydrogels and core/shell hydrogels. The chemical structure and morphologies of the hydrogels were characterized by FT-IR and SEM respectively. It is shown that the modification developed from the outer to the inner layer of polystyrene spheres of the colloidal crystals and modification degree can be controlled by sufonation time and temperature.We further prepared a new kind of sensitive composite hydrogels by polymerization of (acrylic acid sodium)/poly(acrylamide) within above-synthesized sulfonated polystyrene hydrogels. The porous hydrogels were obtained after removing the polystyrene core in the core/shell hydrogels. The ordered structure was confirmed by SEM results. The results of the water uptake showed pH and ion sensitivity of porous hydrogels.The rigid silica template was formed by self-assembly of the monodispersed silica dispersion prepared according to StOber method. Within the interstitial void of the template, p-diketonate titanium complexes (dbm)3Ti(OPh) /MAO catalyzed polymerization of styrene was carried out to form syndiotactic polystyrene (sPS)/silica composites, and the corresponding ordered macroporous syndiotactic polystyrene was achieved after the silica template being removed. The results of FT-IR, DSC revealed that the properties of as-prepared macroporous sPS were significantly different from the bulk one, which resulted from confinement of the silica template.