选取PE100管材专用料树脂TUB121和GC100S,引入凝胶渗透色谱、溶液分级和连续自成核退火(SSA)热分级联用的方法研究了PE100管材料分子链结构特点;并利用单轴拉伸测试获得的性能参数,快速有效地评价了材料抗慢速裂纹增长性能(SCG).得出TUB121重均分子量相对较低,其加工性能和刚性优异;同时其将大量共聚单体均匀地分布在高相对分子质量部分,能有效形成tie链,保证了材料的抗SCG性能;而吉化初期的GC100S重均分子量很高,共聚单体分布不均匀,虽然其抗SCG性能优异,但是加工性能和抗快速裂纹增长性能(RCP)较差;生产线调整后,GC100S系列样品相对分子质量逐渐降低,共聚单体在高相对分子质量组分上分布更加均匀,使其在一定的抗SCG性能基础上,明显改善了加工性能和抗RCP性能.
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