共溶剂对溶胶-凝胶法制备PVA/SiO_2杂化材料的影响  

Influence of Co-Solvent on PVA/SiO_2 Hybrid by Sol-Gel Process

作　　者：叶巧明[1] 邱泽皓[1] 汪灵[1] 

机构地区：[1]成都理工大学材料与化学化工学院,四川成都610059

出　　处：《高分子材料科学与工程》2008年第5期76-79,共4页Polymer Materials Science & Engineering

基　　金："十五"国家科技攻关计划重点项目课题(2004BA810B02);国家自然科学基金资助项目(40572030)

摘　　要：通过溶胶-凝胶法(Sol-Gel)制得了透明PVA/SiO2杂化材料,重点研究了共溶剂的选择对杂化材料相分离的影响。采用扫描电子显微镜和能谱对使用不同共溶剂制备PVA/SiO2杂化材料体系中产生的沉淀物进行了分析研究。结果表明,在溶胶-凝胶法制备PVA/SiO2杂化材料的PVA-TEOS体系中,在以乙醇、四氢呋喃和乙醛为有机共溶剂的情况下,如果pH值控制不当,溶胶过程中会有絮状沉淀物出现。不使用有机共溶剂可合成具有良好透明性、体积收缩小、没有相分离的PVA/SiO2杂化材料。Transparent PVA/SiO2 hybrid was prepared by Sol-Gel process. Phases separation of which caused by choosing the different co-solvent was systematically studied. Floccules of PVA/SiO2 hybrid system prepared by different co-solvent were characterized by SEM,EDX. The results indicate that improper pH value shall bring on flocculent deposit in the PVA-TEOS system When PVA/SiO2 hybrid is prepared by Sol-Gel process and ethanol, Tetrahydrofuran or acetaldehyde is taken as organic co-solvent. The PVA/SiO2 hybrid which has excellent transparence, feeble shrinkage and no phases separation can be synthesized with no organic solvent.

关 键 词：溶胶-凝胶 聚乙烯醇/二氧化硅杂化材料 共溶剂 

分 类 号：TQ325.9[化学工程—合成树脂塑料工业]