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Isothermal crystallization kinetics and crystal structure of poly(lactic acid): Effect of triphenyl phosphate and talc

Authors

  • H. W. Xiao,

    Corresponding author
    1. Ministry-of-Education, Key Laboratory of the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
    • Ministry of Education, Key Laboratory of the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
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  • Peng Li,

    1. Ministry-of-Education, Key Laboratory of the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
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  • Xiaomin Ren,

    1. Ministry-of-Education, Key Laboratory of the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
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  • Tao Jiang,

    1. Ministry-of-Education, Key Laboratory of the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
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  • Jen-Taut Yeh

    1. Ministry-of-Education, Key Laboratory of the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, China
    2. Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Ministry of Education, Wuhan University of Science and Engineering, Wuhan, China
    3. Department and Graduate School of Polymer Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
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Abstract

In this article, kinetics of neat poly(lactic acid) (PLA) and its blends with triphenyl phosphate (TPP) and/or talc crystallized isothermally in the temperature range of 113–128°C was analyzed by differential scanning calorimetry (DSC) and described by the Avrami equation. The results showed that the average value of Avrami exponents n is around 2.0 for neat PLA and the PLA/15TPP blend, and around 3.0 for the PLA/1.2Talc blend and the PLA/15TPP/1.2Talc blend. The crystallization rate constants k for neat PLA and its blends were increased in the following order: the PLA/15TPP blend, neat PLA, the PLA/15TPP/1.2Talc blend, and PLA/1.2Talc blend. The half-time of crystallization t1/2 was increased with an increase of crystallization temperature Tc and the presence of TPP, and was decreased sharply with the incorporation of talc. Further investigation into crystallization activation energy ΔEa of neat PLA and its blends with 15 wt % TPP and/or 1.2 wt % talc showed that the values of ΔEa were increased with the incorporation of TPP and/or talc compared to that of neat PLA. It was verified by wide angle X-ray diffraction (WAXD) that neat PLA and its blends with TPP and/or talc crystallized isothermally in the temperature range of 113–128°C, and all formed the α-form crystal after enough annealing time. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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