聚对苯二甲酸乙二酯轧制及加热过程中的织构研究

Investigation of Crystallographic Texture in Rolled and Heat Treated of Polyethylene Terephthalate

用X射线面探测器研究了半结晶态聚对苯二甲酸乙二酯(PET)在轧制和随后的加热过程中的织构变化。实验结果表明,PET的初始取向接近随机分布状态,轧制形变后的织构包括{100}<001>组分和不完全纤维织构(<001>//轧制方向),并且形变量愈大,织构愈强;对轧制形变后的PET进行加热处理,发现上述织构组分增强,并且随加热温度升高和加热时间延长进一步增强。X射线平均衍射强度法计算PET结晶度的结果表明,结晶度在轧制形变后大幅下降,然后随加热温度升高和加热时间延长逐渐上升。分析认为,PET在轧制形变后的织构演化符合(100)[001]分子链滑动机制。

The crystallographic texture of semi-crystalline PET was investigated during cold rolling and heat treatment based on the X-ray diffractometer equipped with an area detector. Experimental result indicates that the rolling texture consists of a ｜100｜ 〈 001 〉 component and an incomplete fiber（ 〈 001 〉//rolling direction）. Both texture components were enhanced and the textures developed at high temperature faster than low temperature during subsequently heat treatment. The crystallinity of PET in heat treatment process was calculated using the average X-ray diffraction intensity collected by an area detector. The result of calculation reveals that crystallinity decreases drastically during cold roiling and increases gradually during heat treatment. It is considered that the ｜100｜ 〈 001 〉 component induced by cold rolling could be explained by the mechanism of （100）[001 ] molecule chain glide.