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对苯二甲酸乙二酯（PET）等聚合物纤维微观结构和力学性能的影响，采用自行设计和组装的红外光谱仪对振动加热的纤维进行了红外光谱分析。结果表明，振动加热和非振动加热纤维的反式构象随温度的升高而增加，且振动加热纤维的反式含量高于非振动加热纤维。另一方面，随着温度的升高，纤维的扭曲构象逐渐减少，振动加热后纤维的扭曲含量比未振动加热的纤维的要低，这说明振动加热能有效地发展非晶区的取向，抑制晶化。

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.