调控分子链制备的双峰聚乙烯的结晶行为及晶体结构  

Crystallization Behavior and Crystal Structure of Bimodal Polyethylene Blends Prepared by Controlling Molecular Chain

作　　者：居俊杰[1] 谢邦互[1] 杨伟[1] 杨鸣波[1] 

机构地区：[1]四川大学高分子科学与工程学院,四川成都610065

出　　处：《高分子材料科学与工程》2013年第9期32-35,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51073109)

摘　　要：采用熔融共混的方法将高密度聚乙烯(HDPE)5000S与自制的分子链调控聚乙烯(CMPE)共混制备得到了一系列分子量分布(MWD)不同的双峰聚乙烯(BPE)共混物。对共混物进行普通DSC、连续自成核退火热分级技术(SSA)、等温结晶等一系列测试。结果表明,CMPE的加入有利于提高5000S的结晶能力,能加快其结晶速度,并在一定程度上完善其晶体结构。同时在CMPE含量适当时,共混物厚晶片的厚度和厚晶片含量不会发生显著的降低。Polyethylene blends with bimodal molecular weight distribution（MWD） characteristics were prepared by blending high density polyethylene （HDPE）5000S with controlled-molecular polyethylene （CMPE）. Thermal fractionation（SSA） and isothermal crystallization of 5000S/CMPE blends were investigated by differential scanning calorimetry （DSC）. The results show that the addition of CMPE can accelerate the crystallization speed , obviously elevate the crystallization ability, and improve the crystal structure of 5000S in some degree. At the same time, the thickness and the content of thicker lamellae don＇ t have significant change when the content of CMPE is appropriate.

关 键 词：双峰聚乙烯 差示扫描量热分析 热分级 等温结晶 

分 类 号：TQ325.13[化学工程—合成树脂塑料工业]