摘要
采用凝胶渗透色谱分析、核磁共振碳谱分析、升温淋洗分级分析技术研究了PE100级管材用单峰分布高密度聚乙烯(HDPE)DGDB2480H的分子结构及性能,并且与进口双峰PE100级管材树脂HDPE进行了对比。结果表明:两种管材树脂的分子结构不同,主要表现在相对分子质量分布、共聚单体的种类及在主链的分布上;DGDB2480H与进口双峰PE100级管材树脂的流变行为、平衡扭矩及熔体强度基本类似。采用1-己烯作共聚单体、在高相对分子质量部分有较高的共聚单体插人量、采用铬系催化剂是单峰管材树脂DGDB2480H能够达到PE100级的主要原因。
The molecular structure and properties of monomodal PE100 grade high density polyethylene （HDPE）, DGDB2480H, designed for pipes was studied and compared with the imported bimodal PE100 grade HDPE for pipes by means of gel permeation chromatography（GPC）, carbon nuclear magnetic resonance（^13C- NMR）, temperature rising elution fractionation（TREF）. The results show that the two resins have different molecular structures because of their discrepancy in the relative molecular mass distribution and comonomer＇s type and distribution in the main chain. The rheological behavior, balanced torque and melt strength of DGDB2480H are similar to those of the imported bimodal PE100 for pipes. Adopting 1-hexene as comonomer and inserting higher amount of the comonomer in the chain segment with high relative molecular mass as well as using chromium catalyst are deemed as the primary reasons why the monomodal DGDB2480H can reach the requirements of PE100 grade.
出处
《合成树脂及塑料》
CAS
北大核心
2011年第5期14-16,20,共4页
China Synthetic Resin and Plastics
关键词
高密度聚乙烯
共聚单体
管材
结构
熔体强度
high density polyethylene
comonomer
pipe
structure
melt strength
