研究了单向冷拉伸过程中聚偏氟乙烯薄膜的组织结构变化情况。分析结果表明,在未经拉伸的初始膜中,晶体相为α球晶。拉伸使球晶转变成β片晶,转变量的体积分数随着拉伸比率的增加而提高。在室温拉伸条件下,当拉伸比率D≥4.2以后α相完全转变成β相。

This paper concentrated on the microstructure changes in uniaxial stretching film of polyvinylidene fluoride. The studying results show that in undrawn film the crystal phase exists with sperulites.The stretching transformed from α-sperical crystal into β-lamellar crystal,and the transformed volume fractionis increased as the stretching ratios raised.On the condition of the casting film stretched at air temperature,the α-crystal could be completely transformed into β-crystal while the stretching ratio is stretched to D≥42.