摘要
采用超声辐照方法制备了高熔体强度聚乙烯,研究了不同超声条件对相对分子质量分布呈双峰(简称双峰)的高密度聚乙烯(HDPE)分子链结构及性能的影响,并成功制备了高熔体强度聚乙烯。结果表明:延长超声时间可以增加双峰HDPE链缠结程度,但导致部分聚乙烯降解,降低了熔体强度。超声过程中加入微量自由基引发剂过氧化二异丙苯有效地提高了双峰HDPE分子链缠结程度和长链支化结构含量,从而极大提高了双峰HDPE的熔体强度并保留了HDPE优异的力学性能。
The high-melt-strength polyethylene sample was prepared by ultrasonic irradiation to study the effect of different ultrasonic irradiation on molecular chains and performance of HDPE with double-hump molecular weight distribution（bimodal HDPE）. The results show that the level of chain entanglement improves with the increasing of the ultrasonic treatment time while the average molecule weight and melt strength drops. It is shown that the addition of the dicumyl peroxide during ultrasonic irradiation effectively improves the level of chain entanglement and long chain branches as well as melt strength of the sample on contrast with the pure PE.Thereby,the melt strength of HDPE with double-hump improves and excellent mechanical properties of HDPE are reserved.
出处
《合成树脂及塑料》
CAS
北大核心
2016年第1期32-36,52,共6页
China Synthetic Resin and Plastics
基金
国家自然科学基金青年基金(项目号51003027)
关键词
聚乙烯
高熔体强度
超声辐照
长链支化
polyethylene
high melt strength
ultrasonic irradiation
long chain branching
