分子链大尺度高取向而小尺度接近无规取向态的非晶态聚对苯二甲酸乙二酯膜片

AMORPHOUS POLY(ETHYLENE TEREPHTHALATE) FILMS IN THE STATE OF HIGH GLOBAL CHAIN ORIENTATION BUT NEARLY RANDOM SEGMENTAL ORIENTATION

对非晶态聚对苯二甲酸乙二酯膜片经在Ｔｇ以上单轴拉伸然后淬冷至室温的试样，其物理性质的各向同性或各向异性进行了研究．实验结果说明这种分子链大尺度高度取向而小尺度接近无规取向的非晶态（ＧＯＬＲ态）其折光指数和小形变的拉伸模量是接近各向同性的，而热导率和微波介电常数很可能是各向异性的．

The isotropy or anisotropy in some physical properties of the amorphous poly(ethylene terephthalate) films uniaxially drawn at temperatures above its T g and then quenched to room temperature have been studied.Experimental results here presented show that this amorphous state of high global chain orientation but nearly random segmental orientation,the GOLR state,is nearly isotropic in refractive indices and Young′s modulus for small deformation,while it is very probably anisotropic in thermal conduction and microwave dielectric properties.