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Variation of anhydride band area for neat PLA and PLA containing (a) 0.5 and 1 wt.% [93], Reproduced with permission from Dintcheva NTz, Polym. Degrad. Stab.; published by Elsevier, 2017, and (b) 2 and 3 wt.% of ferulic acid (FA) [26], Reproduced with permission from Dintcheva NTz, Polym. Degrad. Stab.; published by Elsevier, 2018.
