高取向聚乙烯的形态与晶体形变

MORPHOLOGY AND CRYSTAL DEFORMATION IN HIGHLY ORIENTED POLYETHYLENE

采用ＳＥＭ 和ＷＡＸＤ分析了高取向ＨＤＰＥ的形态、晶粒尺寸及结晶度。ＨＤＰＥ经口模拉伸，形态由初始材料的微球状结构转变为纤维结构。随着拉伸比的提高，晶粒沿拉伸方向（ｃ轴）的尺寸增大、横向（ａ，ｂ轴）尺寸减小、有序性提高，结晶度增大。口模温度提高，晶粒沿ａ，ｂ，ｃ轴的尺寸均增大，有序性和结晶度提高。表明口模拉伸过程中既存在应力诱导的结晶过程，又存在温度诱导的二次重结晶过程。

Morphology, size of crystal and crystallinity of highly oriented HDPE were analyzed with SEM and WAXD. The HDPE was drawn in the die, its morphology is changed from spherulite structure of original material to fibrillar structure. The size and ordering degree of crystal increase along the drawing direction( c axle), the size cross directions( a,b axles) decreases and the crystallinity increases with the increase of the draw ratio. And with the increase of the die temperature, the size and ordering degree of crystal increase along, a,b,c axle and the crystallinity increase. It is showing where is either the crystallizing process by the stress introducing or secondary crystallizing process by the temperature introducing.