PE-HD/纳米SiO_2杂化材料等温结晶行为的研究  

Isothermal Crystallization Behavior of PE-HD/Nano-SiO_2 Hybrid Materials

作　　者：施海华[1] 郁加华[1] 熊煦[1] 龚方红[1] 

机构地区：[1]江苏工业学院材料科学与工程学院,江苏常州213164

出　　处：《中国塑料》2009年第6期35-39,共5页China Plastics

基　　金：江苏省高校自然科学基金资助项目(05KJB430024)

摘　　要：通过熔融接枝反应将乙烯基三甲氧基硅烷接枝到高密度聚乙烯(PE-HD)分子链上,以四乙氧基硅烷为前驱体,加入接枝的PE-HD中,通过溶胶-凝胶法制备了PE-HD/纳米SiO2杂化材料。用差示扫描量热法研究了纳米SiO2对PE-HD等温结晶行为的影响。结果表明,随着结晶温度的提高,PE-HD和PE-HD/纳米SiO2杂化材料等温结晶峰明显右移,说明结晶所用时间延长,结晶速率下降;纳米SiO2在PE-HD中起到异相成核的作用,使PE-HD/纳米SiO2的结晶速率比PE-HD的大。等温结晶动力学研究表明,随着结晶温度的提高,两种材料的半结晶期都有所延长,且PE-HD/纳米SiO2杂化材料比PE-HD延长的幅度更大。Vinyl trimethoxysilane （VTMS） was grafted onto polyethylene （PE-HD） via melt grafting reaction. The grafted PE-HD was allowed to react with forming PE-HD/nano-SiO2 hybrid materials via sol-gel process. The influence of nano-SiO2 on the crystallization behavior of PE-HD was studied with differential scanning calorimetry. It showed that for both PE-HD and PE-HD/nano- SiO2 hybrid materials, the crystallization rate decreased with increasing crystallization temperature; nano-SiO2 acted as sites for heterogeneous nucleation. The result of isothermal crystallization kinetics showed that the half-crystallization time of both PE-HD and PE-HD/nano-SiO2 hybrid materials increased with increasing crystallization temperature.

关 键 词：高密度聚乙烯 纳米二氧化硅 杂化 等温结晶 动力学 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]