The high activ penta-coordinated silicon potassium compound was prepared by the reaction of amorphous silica with the ethylene glycol,catalyzed by the potassium hydroxide,and the ethyl tetra-coordinated silicon compound was synthesized by the reaction of this penta-coordinate silicon potassium compound with allyl chloride.Then the copolymer was prepared by the reactwn of this ethyl tetra-coordinated silicon with the methyl-acrylic acid β-hydroxyl ethyl ester,and its structure and thermal property were characterized by IR,TG,DSC et al.IR indicated the reaction has finished because of no absorption near 1630cm-1.TG indicated the decomposing temperature of copolymer is 300 ℃.DSC indicated the glass transition temperature is 63.1℃.The copolymer was not soluble in any solvent and had no melt-point.All analysis proved the copolymer exists some extent linkage.
The styrene-acrylic（St-BA-MAA/SDS-DNS86/H2O）emulsion modified by the ethyl-tetra-coordinated silicon was prepared,using water as the solvent,the laurel sodium sulfate and alkyl ethyl sulfuric acid sodium（SDS-DNS86） as the emulsifiers potassium per-sulfate（KPS） for the initiator and adding the initiator minute steps for free radical polymerization.The thermal properties analyzed by TG and the glass transition temperature determined by DSC were researched to the styrene-acrylic emulsion and emulsions modified by ethyl-tetra-coordinated silicon.The results indicated that the thermal properties of the modified membrane increas and the glass transition temperature of the modified membrane decreases and adhesion force of the modified membrane enhances.
