应用化学2025，Vol.42Issue(4)：490-498,9.DOI:10.19894/j.issn.1000-0518.240307
比较4种应用于薄膜与管道的聚乙烯树脂的链结构特点
Comparison of Chain Microstructure of Four Polyethylene Resins for Films and Pipes
高宇新 1刘巍 2李瑞 2潘艳雄 2王登飞 1张茗郡 1何书艳 1姬相玲2
作者信息
- 1. 中国石油天然气股份有限公司大庆化工研究中心,大庆 163714
- 2. 中国科学院长春应用化学研究所,高分子科学与技术全国重点实验室,长春 130022
- 折叠
摘要
Abstract
Polyethylene is one of the most widely used polymer materials in the world.Chain structure parameters including the content and distribution of α-olefin comonomer along the chains in the polyethylene copolymer have significant effects on the properties and applications of polyethylene resin.The chain structure of four ethylene/1-octene copolymers for films and pipes was studied by high-temperature gel permeation chromatography,high temperature 13 C nuclear magnetic resonance spectroscopy,differential scanning calorimeter and successive self-nucleation and annealing and further compared.The four polyethylene resins are used for casting film(CPE),polyethylene pipe of raised temperature resistance(PERT),linear low density polyethylene(LLDPE)packaging and biaxial stretched polyethylene(BOPE)film.The primary chain structure parameters,including relative molecular mass and its distribution,comonomer molar fraction,triad sequence distribution,average ethylene and 1-octene sequence length,average methylene sequence length,were determined and compared.The obtained chain structure information shows that although both CPE and PERT are high density polyethylene,the relative molecular mass of PERT is much higher and the molecular mass distribution is wider,which improve the environmental stress cracking resistance,impact resistance and slow crack growth resistance of PERT pipes by forming more tie molecules between crystalline lamellae.Both LLDPE and BOPE are linear low density polyethylene,but BOPE contains more and longer crystalline sequences,which is conducive to improving the orientation of molecular chains during stretching.关键词
聚乙烯/共聚单体/链结构/序列分布Key words
Polyethylene/Comonomer/Chain structure/Sequence distribution分类
化学引用本文复制引用
高宇新,刘巍,李瑞,潘艳雄,王登飞,张茗郡,何书艳,姬相玲..比较4种应用于薄膜与管道的聚乙烯树脂的链结构特点[J].应用化学,2025,42(4):490-498,9.
