3 years ago

Effect of the different architectures and molecular weights on stereocomplex in enantiomeric polylactides-b-MPEG block copolymers

Effect of the different architectures and molecular weights on stereocomplex in enantiomeric polylactides-b-MPEG block copolymers
Poly(lactide) stereocomplex (PLA SC) and poly(ethylene glycol) (PEG) crystallites were obtained in MPEG-b-PLLA/MPEG-b-PDLA (linear blend, 1/1) and 4PEG-b-PLLA/4PEG-b-PDLA (4-arm blend, 1/1) by solution-casting method. The molecular weights of PLLA and PDLA (M n, PLA ) were similar in all the linear and 4-arm blends. Only PLA SC and PEG crystallites were observed, and PLA homocrystallites were absent in all blends. The different M n, PLA and chain architectures did not alter the crystalline structures of PLA SC and PEG, but greatly influenced their melting temperatures and crystallinities. As the average M n, PLA per arm of linear and 4-arm blends were similar, the melting temperatures and crystallinities of PLA SC and PEG in 4-arm blends were always lower than those of linear blends, which could be ascribed to the huge steric hindrance of 4-arm structures. This investigation on PEG-b-PLLA/PEG-b-PDLA blends with various structures could provide basic data for the applications of PLA stereocomplex.

Publisher URL: www.sciencedirect.com/science

DOI: S003238611730664X

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