Competitive Mechanism of Stereocomplexes and Homocrystals in High-Performance Symmetric and Asymmetric Poly(lactic acid) Enantiomers: Qualitative Methods.

ABSTRACT: To systematically explore the critical contributions of both molecular weights and crystallization temperature and chain length and molar ratios to the formation of stereocomplexes (SCs), our group quantitatively prepared a wide MW range of symmetric and asymmetric poly(lactic acid) (PLA) racemic blends, which contains L-MW PLLA with M _n > 6k g/mol. The crystallinity and relative fraction of SCs increase with T _c, and the SCs are exclusively formed at T _c > 180 °C in M/H-MW racemic blends. When MWs of one of the enantiomers are over 6k and less than 41k, multiple stereocomplexation is clear in the asymmetric racemic blends and more ordered SCs form with less entanglement or the amorphous region compared to those for the MW of the enanti

SUBMITTER: Guo M 

PROVIDER: S-EPMC9670727 | biostudies-literature | 2022 Nov

REPOSITORIES: biostudies-literature