调控分子链制备的双峰聚乙烯的分子量分布及性能  

Molecular Weight Distribution and Properties 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5期67-70,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(51073109)

摘　　要：采用高密度聚乙烯(HDPE)5000S和自制的分子链调控聚乙烯(CMPE)熔融共混得到一系列分子量分布具有双峰特征的聚乙烯共混物。采用凝胶渗透色谱仪(GPC)测定了共混物的分子量分布(MWD)曲线,并研究了共混物材料的拉伸、冲击及断裂韧性等力学性能及加工性能。研究表明,CMPE的MWD曲线的峰位置显著向低分子量方向移动,便于用来制备双峰聚乙烯。加入CMPE有利于显著提高材料的加工流动性,且当CMPE的质量分数在20%以下时,材料的拉伸强度、冲击强度以及断裂韧性等力学性能均维持在较高的水平,不出现明显的降低。Polyethylene blends with bimodal molecular weight distribution（MWD） characteristics were prepared by blending high density polyethylene （HDPE） 5000S with controlled-molecular polyethylene （CMPE）. The molecular weight of the bimodal polyethylene blends was studied by GPC. The tensile strength, impact strength, fracture toughness and processability of blends were also investigated. The results show that the MWD curve＇s peak of CMPE moves towards low molecular weight direction significantly, indicating that CMPE is appropriate for preparing bimodal polyethylene. The processability of blends is improved obviously after the addition of CMPE, at the same time, the tensile strength, impact strength and fracture toughness don＇t decrease evidently and keep in a high level when the mass fraction of CMPE in the blends is lower than 20 %.

关 键 词：双峰聚乙烯 分子量分布 力学性能 断裂韧性 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]