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Antioxidant-conjugated star-shaped PLLA (star-PLLA-PPD) were originally proposed as a novel polyfunctional free radical stabilizing additive for bioplastics. By a simple ring opening polymerization of l-lactide (L-LA) on a poly-functional core molecule (i.e., pentaerylthritol) using tin (II)-2-ethylhexanoate (SnOct2) as a catalyst, the 4-arms star-shaped PLLA was successfully prepared and confirmed...