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采用熔融共混的方法制备了PLA/POE-g-MAH/TAIC共混材料,并进行γ射线辐照。通过力学、凝胶和扫描电镜测试,研究了共混材料的辐照效应。结果表明,辐照可以对该体系进行界面原位增容,从而提高其力学性能。当重量配比为50/50/3的PLA/POE-g-MAH/TAIC共混材料在30 kGy剂量下辐照时,其缺口冲击强度得到明显提升,达到20.8 kJ/m2,约为未辐照时的2.5倍。扫描电镜、凝胶抽提的测试结果与力学性能的变化相一致。当共混物在适当剂量下辐照时,由于界面处包含两相链段的共聚物的生成,体系的相容性得到改善。在发生冲击破坏时,共混材料中产生大量的屈服形变,表现出明显的韧性断裂特性。
PLA / POE-g-MAH / TAIC blends were prepared by melt blending and irradiated with γ-rays. The effects of irradiation on the blends were studied by mechanics, gel and scanning electron microscopy. The results show that the irradiation can make the system in situ interface compatibilization, thereby enhancing its mechanical properties. When the weight ratio of 50/50/3 PLA / POE-g-MAH / TAIC blends irradiation at 30 kGy dose, the notched impact strength has been significantly improved, reaching 20.8 kJ / m2, about the non-spoke Shoot 2.5 times. Scanning electron microscopy, gel extraction test results consistent with changes in mechanical properties. As the blend is irradiated at the proper dose, the compatibility of the system is improved due to the formation of copolymers containing two-phase segments at the interface. In the event of impact failure, a large amount of yielding deformation occurred in the blend, showing a clear ductile fracture characteristics.