Textile Science and Engineering (한국섬유공학회지)

The Korean Fiber Society (한국섬유공학회)
권호 표지

Crystallization Behavior and Thermal Property of Poly(D-lactic acid-b-L-lactic acid)

Poly(D-lactic acid-b-L-lactic acid)의 결정화거동 및 열적 특성

  • Lee, Kyoung-Woo (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Park, Heung-Su (Department of Organic Materials and Fiber Engineering, Soongsil University) ;
  • Kim, Young-Ho (Department of Organic Materials and Fiber Engineering, Soongsil University)
  • 이경우 (숭실대학교 유기신소재.파이버공학과) ;
  • 박흥수 (숭실대학교 유기신소재.파이버공학과) ;
  • 김영호 (숭실대학교 유기신소재.파이버공학과)
  • Received : 2010.10.30
  • Accepted : 2010.11.30
  • Published : 2010.12.31
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Abstract

A stereocomplex of poly(lactic acid) (PLA) from the opposite enantiomeric configurations of the L and D forms has higher thermal resistance and mechanical properties than poly(L-lactic acid) (PLLA), which may overcome the problems with the low melting temperature of PLLA when used as a commercial fiber. In this study, the crystallization behavior and thermal properties of poly(D-lactic acid-b-L-lactic acid) (PDLLA) block copolymer (50:50, w/w) were characterized by differential scanning calorimetry (DSC), dynamic mechanical analysis, and wide angle X-ray diffraction (WAXD) analysis. DSC showed that the melting temperature of the stereocomplex crystal was approximately $215^{\circ}C$, which was much higher than that of homo PLLA (${\sim}168^{\circ}C$). The equilibrium melting temperature and stability parameter of PDLLA obtained from the Hoffman-Weeks plot was $230^{\circ}C$ and 0.44, respectively. Compared to the WAXD peaks of the ${\alpha}$-form crystal of PLLA, additional peaks were observed for PDLLA at $11.9^{\circ}$, $20.8^{\circ}$, and $23.6^{\circ}$ $2{\theta}$ arising from the D,L-stereocomplex crystal of PLA. The crystallization behaviors of PDLLA and PLLA during the heating and cooling processes from the melt-quenched state and from the molten state, respectively, were compared using the WAXD curves obtained from a synchrotron X-ray source. The effects of annealing of both PLLA and PDLLA films at different temperatures on the crystal formation were also examined.

Keywords

Acknowledgement

Supported by : 한국과학재단

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