热处理对聚乙烯形态及其电树起始电压的影响

Annealing Effecton the Morphology of Polyethylene Materials and the Tree Initiation Voltage

本文主要介绍了不同的热处理条件对聚乙烯 (PE)薄膜材料电树的起始电压的影响。电树的起始电压很大程度上取决于半结晶高分子材料的形态结构。对低密度聚乙烯、线性低密度聚乙烯、高密度聚乙烯三种薄膜试样进行了测量。结果表明 ,重结晶处理后 ,试样的结晶度以及球晶内部晶层厚度明显提高 ,但是试样中球晶的尺寸却基本没有变化。同时还发现 ,经过重结晶后 ,电树的起始电压也升高了。试验结果还表明 ,电树的起始电压是随着晶层厚度的增加而增加的。

This paper presents the effects of different annealing conditions on the tree initiation of polyethylene(PE) films.It is well known that electrical trees are greatly influenced by the morphological structure in semi- crystalline polymers.Samples of PE films,including low- density PE,linear low- density PE and high- density PE were measured.It was found that after re- crystallizing the crystallinity and the thickness of lamella increase,while the size change of the spherulites is invisible.It was also found that the tree initiation voltage increases after re- crystallizing.Finally we found that the increase of tree initiation voltage can be inherently related with the increaese of the thickness of lamella.