In this study, a detailed characterization was carried out of a product formed in the melt reaction of poly(lactic acid) PLA with maleic anhydride, initiated by dicumyl peroxide under the reaction conditions reported herein. The chemical structure of the reaction product was determined by ¹H NMR and ¹³C NMR spectroscopy and by DEPT-135 and ¹³C-¹H HSQC techniques. It was found that, under the conditions applied in this study, instead of the well-reported grafting of maleic anhydride onto the PLA, a product was formed from the reaction of two PLA macro-radicals, which probably occurs after the β-scission mechanism. The ¹³C NMR spectrum of the proposed reaction product was also calculated using the GIAO-DFT method and the result is in agreement with the experimental spectrum.

在这项研究中，对聚乳酸PLA与马来酸酐的熔融反应中形成的产物进行了详细的表征，该产物是在本文报道的反应条件下由过氧化二枯基引发的。反应产物的化学结构通过¹ H NMR和¹³ C NMR光谱以及DEPT-135和¹³ C - ¹ H HSQC技术确定。结果发现，在本研究中所应用的条件下，不是将报道的顺丁烯二酸酐接枝到PLA上，而是由两个PLA宏观自由基反应生成的产物，这很可能是在β断裂机理之后发生的。 。在¹³还使用GIAO-DFT方法计算了拟议的反应产物的13 C NMR光谱，其结果与实验光谱一致。