相对分子质量分布对双峰聚乙烯薄膜树脂等温结晶动力学的影响  

Effect of Molecular Weight Distribution on Isothermal Crystallization Kinetics of Bimodal Polyethylene Resin for Films

作　　者：屈晓峰 王长全 韩向艳[1] 雷良才[1] 胡跃鑫[1] 

机构地区：[1]辽宁石油化工大学化学与材料科学学院,辽宁抚顺113001 [2]中国石油抚顺石化公司,辽宁抚顺113008

出　　处：《中国塑料》2018年第2期44-48,共5页China Plastics

基　　金：辽宁省教育厅科学研究一般项目(L2016001);辽宁石油化工大学国家级科研项目培育基金资助(2016PY-004);辽宁省科技厅博士启动基金(20170520284)

摘　　要：研究了2种双峰聚乙烯薄膜树脂(9455F_1-W和9455F_1-100)的等温结晶动力学行为,并讨论了相对分子质量分布的双峰相对含量对结晶过程的影响。结果表明,2种样品都呈现双峰分布的特征,且其相对分子质量相差不大,但高/低相对分子质量级分含量不同;其中,9455F_1-W样品的高相对分子质量级分的相对含量大,9455F_1-100样品的低相对分子质量级分的相对含量大;随低相对分子质量级分含量的增加,样品的结晶速率常数增大,半结晶时间减小,结晶速率增大。Isothermal crystallization kinetics of two types of bimodal polyethylene resins（9455F_1-W and 9455F_1-100）for films was studied in this work,and the effect of bimodal molecular weight distribution on their crystallization behavior was discussed.The results from gel permeation chromatography measurements indicated that these two types of resins exhibited a bimodal distribution feature.They had a similar molecular weight but different fractions in high-and lowmolecular-weight macromolecules.9455F_1-W sample had a higher fraction in-molecular-weight macromolecules than 9455F_1-100 sample.Isothermal crystallization investigation indicated that the crystallization rate constant increased with an increase in the fraction of low-molecular-weight macromolecules,and however the half crystallization time decreased,suggesting an increase in crystallization rate.

关 键 词：双峰聚乙烯 等温结晶动力学 相对分子质量分布 结晶速率 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]