The knowledge about the influence of the electron beam (EB) radiation dose on the chemical and physical changes of polymers is critical either for sterilization purpose or materials modification. In this work, the effect of EB irradiation dose ranging 25–100 kGy on the properties of commercial poly(lactic acid) (PLA), poly(butylene adipate-co-terephthalate) (PBAT) and their blends was compared. The samples of about 0.5 mm in thickness were prepared by hot pressing. The changes in molecular weight, yellow index, thermal and mechanical properties were evaluated. The main findings are that a severe reduction in the glass transition and melting temperatures as well as the mechanical properties of PLA occurs when subjected to higher doses of EB irradiation, which can be ascribed to irradiation-induced decrease in molecular weight; while the effect of EB irradiation on the molecular weight and mechanical properties of PBAT and PLA/PBAT blends is ignorable.

关于电子束（EB）辐射剂量对聚合物化学和物理变化的影响的知识对于灭菌目的或材料改性至关重要。在这项工作中，电子束辐照剂量对商业聚（乳酸）（PLA），聚的性质测距25-100千戈瑞的效果（亚丁基己二酸酯共（对苯二甲酸）（PBAT）及其混合物。通过热压制备约0.5mm厚的样品。评价了分子量，黄度指数，热和机械性能的变化。主要发现是，当经受较高剂量的EB辐射时，玻璃化转变温度和熔融温度以及PLA的机械性能会大大降低，这可归因于辐射引起的分子量降低；而EB辐射对PBAT和PLA / PBAT共混物的分子量和机械性能的影响是可忽略的。