Crystallization and Properties of Poly(lactide)/Poly(δ-valerolactone) Alternating Supramolecular Copolymers Adjusted by Stereocomplexation.

ABSTRACT: The crystallization behavior of a series of synthesized polylactide (PLA)/poly(δ-valerolactone) (PVL) supramolecular copolymers with 2-ureido-4[1H]-pyrimidinone (UPy) groups is investigated by differential scanning calorimetry and X-ray diffraction. The stereocomplexation of PLA-based supramolecular polymers (SMPs) is strongly related to the block length, L/D ratios, and the UPy groups. Both the increase of the PLA block length and the self-complementary hydrogen bonding of the UPy end groups restrain the crystallization of the PVL blocks. The stereocomplexation of PLA-SMPs is greatly promoted by UPy groups, while the homocrystallization of PLA is constrained. The dynamic mechanical analysis indicated that the enhanced stereocomplexation would lead to higher thermal resistance and m

SUBMITTER: Shi X 

PROVIDER: S-EPMC6648093 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature