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This study employed solid hot stretching technology to produce successfully specifically oriented polylactic acid (PLA) while investigating the impact of orientation structure on its photo-oxidation aging properties. After orientation, the molecular weight and mechanical properties retention rate of PLA were improved, and the crystallinity (X c ) increased in conjunction with prolonged aging time, while the molecular orientation failed to modify the mechanism responsible for PLA deterioration. Furthermore, an examination regarding the way in which the photo-oxidation stability of PLA was enhanced, demonstrated that the increased X c  and structural orientation were beneficial for delaying the photo-oxidation aging of PLA.

Preparation and Photo-Oxidation Aging Behavior of Oriented Polylactic Acid