Targeted Upcycling of Poly(L‐lactide) Based on Stereocomplexation Technology

Abstract Poly (L‐lactide) can cause serious plastic pollution if discarded without proper treatment. However, how to recycle Poly (L‐lactide) efficiently and economically is still a major challenge. This work aims to recycle Poly (L‐lactide) from waste by selective precipitation using stereocomplex technology. In this strategy, Poly (D‐lactide) is specifically and selectively stereocomplexed with Poly (L‐lactide) in the mixed system to form a precipitate, and then filtered and recovered to obtain the stereocomplex polylactide with better water and heat resistance, thus achieving upcycling. A recovery rate of 90% by weight of Poly (L‐lactide) is achieved. In addition, nanofibrous membranes are prepared by electrospinning to expand their potential application scenarios. This work provides a reference for the efficient and economical up‐cycling of Poly (L‐lactide) from waste.