改性TiO2在PVC基体中的分散行为研究  

Study on Dispersity of Modified TiO_2 Particles in PVC

作　　者：罗美芳[1] 王焕冰[1] 李春忠[1] 

机构地区：[1]超细材料制备与应用教育部重点实验室,华东理工大学材料科学与工程学院,上海200237

出　　处：《中国塑料》2010年第3期96-100,共5页China Plastics

基　　金：国家自然科学基金项目(50703009)

摘　　要：通过熔融共混法制备了聚氯乙烯/二氧化钛(PVC/TiO2)复合材料,通过扫描电镜观察了TiO2粒子在PVC中的分散状态,并测定了材料的力学性能。结果表明,在粒径一定的条件下,TiO2粒子在PVC中的分散状态及复合材料的力学性能与表面改性方法密切相关;经过钛酸四丁酯偶联剂、γ-氨丙基三乙氧基硅烷偶联剂、聚甲基丙烯酸甲酯(PMMA)改性的TiO2粒子在塑料中分散良好,并能提高材料的冲击强度,当PMMA改性的TiO2粒子添加量为2.5份(质量份,下同)时,冲击强度提高超过100%;而经十二烷基磺酸钠改性的粒子团聚严重,复合材料力学性能明显下降。The PVC/TiO2 composites were prepared via melt hlending. The dispersion of the modified TiO2 particles in PVC was investigated with SEM. The dispersion of the TiO2 particles in PVC and mechanical properties of the composites were related to the surface modification of TiO2 When surface treated with tetrabutyl titanate, γ-aminopropyltriethoxysilane, or polymethYl methacrylate （PMMA）. The TiO2 particles could be well dispersed in PVC, which increased the impact strength. As the content of PMMA-modified TiO2 particles was 2. 5 phr, the Izod impact strength of the composite was two times that of neat PVC. However, when modified with SLS, the particles aggregated severely and thus the mechanical properties of the composite declined.

关 键 词：二氧化钛 聚氯乙烯 分散性 力学性能 

分 类 号：TQ325.3[化学工程—合成树脂塑料工业]