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． A sample of an amorphous polyethylene terephthalate film uniaxially stretched above Tg and then quenched to room temperature was investigated for its isotropy or anisotropy in physical properties. The experimental results show that the refractive index and the strain modulus of small deformation in the GOLR state with large scale and high degree of orientation near the small scale and close to the random orientation are nearly isotropic. The thermal conductivity and microwaves The dielectric constant is likely to be anisotropic.