Formation of Stereocomplex Crystals using Poly (lactic-acid) via Mixture Aerosol Process by Supercritical Anti-Solvent
- Formation of Stereocomplex Crystals using Poly (lactic-acid) via Mixture Aerosol Process by Supercritical Anti-Solvent
- 윤용석; 김수정; 김재훈; 이윤우
- Issue Date
- 2009 한국화학공학회 춘계학술대회
- , 146-146
- Poly(L-lactide)(PLLA) and poly (D-lactide)(PDLA) like other chiral polymers can form a racemate, and the physical properties of which are different from those of the individual enantiomers. It is well- known that D- and L-forms of low molecular weight compounds can produce racemic crystals pon mixing if their molecular affinity is sufficiently strong. In the present study, D-and L-lactides, which are the cyclic monomers of PDLA and PLLA, respectively, possess a melting point at around 170℃. In contrast, their racemic compound melts at around 225℃, a higher temperature than the melting point of PDLA and PLLA. DSC is one of the first choice methods to confirm stereocomplex formation. In most cases stereocomplexes show a characteristic increase in melting temperature. Besides, IR and XRD are employed to investigate blend of stereocomplexation and change of crystallinity.
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