部分结晶PET的物理老化行为

Physical Aging Behavior of Semi - crystalline Poly(ethylene terephthalate)

对部分结晶聚对苯二甲酸乙二酯(PET)的物理老化的研究结果表明,在某一温度条件下,短时间处理的部分结晶样品表现出的老化受限情况最为严重,这与此时其链段的运动能力最差紧密联系。玻璃化转变温度(T_g)附近吸热量△H并非完全随结晶程度的增加而单调下降,说明半晶高分子材料老化行为的发展不仅取决于材料初始的结晶度,而且更直接地取决于结晶后样品的微观形态。

The physical aging behavior of semi - crystalline poly(ethylene terephthalate) (PET) was studied by differential scanning calorimetry (DSC) . The results indicated that the endothermic value (ΔH) near Tg of the semi - crystalline PET did not show a monotonous decrease with the increase of crystallinity of PET. This fact demonstrated that the physical aging of semi - crystalline PET was dependent on not only the crystallization degree, but also the micro - morphology of semi - crystallized PET.