中文摘要：

以聚乙烯醇为胶体保护剂，正硅酸乙酯为前躯体，通过无皂乳液聚合法合成了SiO2／聚丙烯酸酯杂化材料纸张表面增强剂。通过红外光谱（IR）、差示扫描量热（DSC）、热重分析（TGA）和透射电镜（TEM）对杂化材料进行表征，结果表明纳米SiO2和丙烯酸酯之间产生了化学键的结合，无机相的引入使杂化材料的热分解温度升高。初步应用实验结果表明，当增强剂用量为1％时，纸张的环压指数提高36％，抗张强度提高30％，撕裂度提高31％，拉毛强度提高30％。

英文摘要：

SiO2/polyacrylate hybrid materials paper strength agent was prepared by in-situ emulsifier-free emulsion polymerization with tetraethoxysilane（TEOS） as a silica component precursor and polyvinyl aleohol（PVA） as polymeric colloid stabilizer. The hybrid material was characterized by fourier transform infrared （FT-IR）, differential scanning calorimeter （DSC）, thermal gravimetric analyzer （TGA） and transmission electron micro- Scope （TEM）. The results indicated that there were chemical bonds between SiO2 and polyaerylate, and that the thermal stability and the glass transition temperature （Tg） in polyacrylate/SiO2 was 8℃ higher compared to pure polyacrylate. Moreover, the applied properties of the paper were measured as follows when the dosage of the strength agent was 1% ： ring crush index of paper increased by 360/~, paper tensile strength increased by 30%, and tearing strength and picking velocity increased by 31% and 30% respectively.