高密度聚乙烯/纳米黏土复合材料的结晶行为研究  

Study on Crystallization Behaviors of High Density Polyethylene/Clay Nanocomposites

作　　者：陈斌艺[1] 王向东[1] 张玉霞[1] 

机构地区：[1]北京工商大学材料科学与工程系,北京100048

出　　处：《中国塑料》2009年第8期53-60,共8页China Plastics

基　　金：北京市教育委员会科技发展计划面上面目资助(KM200910011006);北京市自然科学基金项目资助(2062008)

摘　　要：通过熔融插层法制备了高密度聚乙烯/纳米黏土复合材料(PE-HDCS),采用差示扫描量热仪测试了材料在不同降温速率下的结晶性能,并通过Avrami方法、Ozawa方法和莫志深方法等研究了其结晶行为。研究发现,加入纳米黏土可提高高密度聚乙烯(PE-HD)的结晶温度、熔融温度和结晶度。非等温结晶动力学研究得到纳米黏土复合材料的t1/2、Zt和F(T)等结晶参数值表明,纳米黏土起促进成核、加速结晶的作用。通过热台偏光显微镜观察也证实了PE-HDCS比PE-HD能更好地成核和结晶,使得晶粒尺寸变小,晶粒密度增大。表明纳米黏土与PE-HD之间形成"插层"结构,增强其相互作用,有利于结晶运动中链段排列。In this article, high density polyethylene（PE-HD）/clay nanocomposites were prepared via melt intercalation. The crystallization behavior was investigated uisng differential scanning calorimetry （DSC） at various cooling rates. Avrami, Ozawa and Mo methods were applied to describe the crystallization process under nonisothermal conditions. The crystallization temperature, melting temperature, and crystallinity of the nano-composites were found higher than those of neat PE- HD. The values of t1/2 ,Zt and F（T） showed that clay played a role of heterogeneous nucleating agent and accelerated the crystallization process of PE-HD, which could be attributed to the intercalation structure formed between PE-HD and clay.

关 键 词：高密度聚乙烯 纳米黏土 熔融插层法 结晶动力学 成核 结晶 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]