3 years ago

Unique Transitions in Morphology and Characteristics of Porous Poly(Lactic Acid) Enantiomers

Unique Transitions in Morphology and Characteristics of Porous Poly(Lactic Acid) Enantiomers
Tomonari Kanno, Hiroshi Uyama
This study examines unique changes in the morphology and physical properties of monolithic poly(lactic acid) (PLA) enantiomers. It is revealed for the first time that PLA monoliths containing stereocomplex (sc) crystals are successfully produced using enantiomeric poly(L-lactic acid) (PLLA) and poly(D-lactic acid) (PDLA) using a simple phase separation process with ternary solvent (1,4-dioxane/2-butanone/water). The basic structure of the monoliths is changed drastically from needle-like to spherical morphology until reaching a PLLA/PDLA ratio to equivalence. The PLA monolith prepared from a stoichiometric amount of PLLA/PDLA has high sc crystallinity without any homochiral crystals, and it shows higher melting temperature (226 °C), surface area (131 m2 g−1), and water contact angle (144.5°) compared with those of neat PLLA (180 °C, 86 m2 g−1, and 137.5°, respectively). Moreover, this sc-PLA monolith exhibits excellent resistance to several good solvents of PLLA, whereas the pristine PLLA monolith is dissolved instantly in these solvents. Poly(lactic acid) (PLA) monoliths with stereocomplex formation exhibiting both excellent heat and chemical resistance are designed by newly developed phase separation. A basic structure of the monoliths is changed drastically by the ratio of poly(L-lactic acid)/poly(D-lactic acid) (PLLA/PDLA): The PLA monolith prepared from neat PLLA or PDLA shows interconnected needle-like morphology whereas that prepared from PLLA/PDLA exhibits spherical structure.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/macp.201700547

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