摘要
大剂量(>50Mrad)γ辐照使PET分子链断裂并导入含氧的苯环基团。短路热释电流温度谱显示α峰随辐照剂量增大向低温移动,被冻结的大分子主链链段偶极热松弛活化能和热松弛时间常数受辐照剂量的影响较小。
The behavior of dipolar thermal relaxation of γ-irradiated poly(ethylene terephthalate)(PET) is studied by the method of TSC. ^(60)Co γ-irradiation of a larger dose(50-500Mrad) leads to the breaking of macromolecular chains and the increasing of group density of phenyl with oxygen in PET. The α peak of short-circuit thermally stimulated current shifts to the lower temperature when the irradiation dose is increased. The γ-irradiation has no remarkable effect on the activation energy and the time constant of dipolar thermal relaxation for the main chain segmental motion in amorphous region of γ-irradiated PET films.
关键词
PET
偶极热松驰
Γ辐照
热释电流
poly (ethylene terephthalate), γ-irradiation, thermally stimulated current, dipolar thermal relaxation
