论文部分内容阅读
为了了解PET球晶的拉伸性能与球晶结构的关系以及无定形PET的取向和结晶,我们采取了两条不同的路线来制备样品:(1)先用溶液浇铸成膜的办法制备具有正球晶、负球晶或非常球晶的薄膜,然后进行单轴拉伸。电子显微图象及电子衍射证明,球晶的拉伸性能与C轴和球晶半径方向的夹角有关,夹角愈大拉伸愈困难;(2)先制备无定形的薄膜,然后在玻璃化温度附近进行单轴拉伸以获得C轴取向,再在215℃退火,使之结晶。电子衍射图证明,这样制备的样品具有高度的C轴取向。DSC结果表明,结晶的完善程度远比球晶的为高。
In order to understand the relationship between the tensile properties of spherulites and the spherulitic structure of PET and the orientation and crystallization of amorphous PET, we took two different routes to prepare samples: (1) Spherulites, spherulites, or spherulites, and then uniaxially stretched. Electron microscopy and electron diffraction show that the tensile properties of spherulites are related to the angle between the C-axis and the spherulites. The larger the angle, the more difficult it is to stretch. (2) An amorphous film is prepared first, Uniaxial stretching was performed in the vicinity of the glass transition temperature to obtain a C-axis orientation, followed by annealing at 215 ° C to crystallize it. Electron diffraction patterns demonstrated that the sample thus prepared had a high C-axis orientation. DSC results show that the degree of perfection of the crystal is much higher than spherulites.