CHANGES IN MICROSTRUCTURE OF POLYMERS HOT-DRAWN UNDER LOW FREQUENCY VIBRATION

为了研究热拉伸过程中振动对聚合物（如聚对苯二甲酸乙酯纤维）的微观结构和力学性能的影响，利用本实验室自行设计和组装的新仪器对热拉伸过程中振动加热的纤维进行了FT-IR测量。结果表明：振动前后纤维的反式构象随温度升高而增大，且振动前后纤维的反式含量高于无振动前后纤维的反式含量；另一方面，纤维的间扭式构象随着温度的升高而降低，经过振动加热的纤维的间扭式构象含量低于未经过振动加热的纤维。结果表明，振动加热是有效的非晶区发展方向，抑制了非晶的形成。

To study the effect of vibrating during hot-drawing on microstructure and mechanical properties of polymers such as poly(ethylene terephthalate) fibers, the FT-IR measurements for the fiber heated under vibration were carried out by a new apparatus designed and assembled in our laboratory. The results showed that the trans conformation of the fiber heated with and without the vibration increased with increasing temperature, and that the trans content of the fiber heated with vibration was higher than that heated without vibration. On the other hand, the gauche conformation decreased with temperature, and the gauche content of the fiber heated with the vibration was lower than that of the fiber without the vibration.As the results, the vibrating-heating was found to be effective developing orientation of amorphous region and inhibiting the crystallization.