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. Experi...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.展开更多
文摘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.
