Crystallization and orientation of PET films of different crystallization rates have been studied doing various techniques during stretching.
用多种方法对两个结晶速率不同的PET样品在拉伸过程中的结晶和取向进行了研究。
2
The orientation behaviour of molecular chains of hard elastic polypropylene(HEPP) film was investigated on the uniaxial stretching by polarized IR Vibration-Mechanical Spectroscopy.
本文用力学-振动光谱研究了硬弹性聚丙烯（HEPP）晶区和非晶区分子链在拉伸时取向的变化。
3
Thus, the stretching, orientation, heating and crystallization all changed in different parts of the film and this was one of the reasons for the property variations of the films produced.