On the kinetics of melting and crystallization of poly(l-lactic acid) by TMDSC

M. Salmerón Sánchez, J. L. Gómez Ribelles, F. Hernández Sánchez, J. F. Mano

研究成果: Contribution to journalArticle査読

44 被引用数 (Scopus)

抄録

The crystallization and melting process of poly(l-lactic acid), PLLA, is investigated by temperature modulated differential scanning calorimetry, TMDSC. The sample is cooled from the melt to different temperatures and the crystallization process is followed by subjecting the material to a modulated quasi-isothermal stage. From the average component of the heat flow and the application of the Lauritzen-Hoffman theory two crystallization regimes are identified with a transition temperature around 118 °C. Besides, the oscillating heat flow allows calculating the crystal growth rate via the model proposed by Toda et al., what gives, in addition, an independent determination of the transition temperature from modulated experiments. Further, the kinetics of melting is studied by modulated heating scans at different frequencies. A strong frequency dependence is found both in the real and imaginary part of the complex heat capacity in the transition region. The kinetic response of the material to the temperature modulation is analyzed with the model proposed by Toda et al. Finally, step-wise quasi-isothermal TMDSC was used to investigate the reversible surface crystallization and melting both on cooling and heating and a small excess heat capacity is observed.

本文言語英語
ページ(範囲)201-210
ページ数10
ジャーナルThermochimica Acta
430
1-2
DOI
出版ステータス出版済み - 6 2005
外部発表はい

All Science Journal Classification (ASJC) codes

  • 器械工学
  • 凝縮系物理学
  • 物理化学および理論化学

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