Maleated poly(lactic acid) (PLA‐g ‐MA) was prepared through melt grafting of maleic anhydride onto a PLA backbone with the aid of a radical initiator. PLA‐g ‐MA thus formed was incorporated into PLA/polyamide 11 (PA11) blends as a reactive compatibilizer. By morphological observation, it was assessed that PLA‐g ‐MA lowered the interfacial energy and strengthened the interface between PLA and PA11. However, the compatibilized PLA/PA11 blends did not show significant improvement of impact strength compared with noncompatibilized PLA/PA11 blends. Measurements of the molecular weight and impact strength of PLAs compounded with various amounts of radical initiators revealed that decreased molecular weight of PLA by the radical initiator used for the preparation of PLA‐g ‐MA is responsible for this unexpected result. To compensate the decrease of the molecular weight, a crosslinking agent was incorporated in the preparation step of PLA‐g ‐MA. It was found that the crosslinking agent is effective in preventing the molecular weight reduction. As a result, the impact strength of the PLA/PA11 blend was enhanced to a great extent by the PLA‐g ‐MA prepared with the crosslinking agent.

中文翻译：

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通过交联剂提高相容化聚乳酸/聚酰胺11共混物的冲击强度

马来酸化的聚乳酸（PLA- g- MA）是通过自由基引发剂将马来酸酐熔融接枝到PLA骨架上而制得的。PLA-克-MA由此形成掺入PLA /聚酰胺11（PA11）共混物作为反应性增容剂。通过形态学观察，有人评价说PLA-克‐MA降低了界面能并增强了PLA和PA11之间的界面。但是，与不相容的PLA / PA11混合物相比，相容的PLA / PA11混合物并未显示出明显的冲击强度改善。测量与各种自由基引发剂混合的PLA的分子量和冲击强度表明，用于制备PLA‐ g‐ MA的自由基引发剂降低了PLA的分子量，这是造成这种意外结果的原因。为了补偿分子量的减小，交联剂中的PLA-制备步骤被合并克-嘛。发现交联剂对于防止分子量降低是有效的。结果，用交联剂制备的PLA- g- MA大大提高了PLA / PA11共混物的冲击强度。