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Nonisothermal crystallization and melting behavior of poly(ε-caprolactone)-b-poly(ethylene glycol)-b-poly(ε-caprolactone) by DSC analysis

Authors

  • Zhiyong Wei,

    Corresponding author
    1. School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, People's Republic of China
    • School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, People's Republic of China
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  • Fengyun Yu,

    1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
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  • Guangyi Chen,

    1. School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, People's Republic of China
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  • Chao Qu,

    1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, People's Republic of China
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  • Pei Wang,

    1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, People's Republic of China
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  • Wanxi Zhang,

    1. School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, People's Republic of China
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  • Jicai Liang,

    1. School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis of Industrial Equipment, Dalian University of Technology, Dalian 116024, People's Republic of China
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  • Min Qi,

    1. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, People's Republic of China
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  • Lian Liu

    Corresponding author
    1. Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, People's Republic of China
    • Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, People's Republic of China
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Abstract

Nonisothermal crystallization kinetics and melting behavior of poly(ε-caprolactone)-b-poly(ethylene glycol)-b-poly(ε-caprolactone) triblock copolymer (PCL-PEG-PCL), in which the weight fraction of the PCL block is 0.87, has been studied by differential scanning calorimetry (DSC). The nonisothermal crystallization data at various cooling rates are analyzed with the Ozawa, modified Avrami, and Mo models. The modified Avrami and Mo models were found to describe the nonisothermal crystallization processes fairly well. The values of the Avrami exponent n were near three, suggesting the crystallization process with a three-dimensional crystallite growth by heterogeneous nucleation mechanism. The crystallization activation energy estimated from the cooling scans using Kissinger's method was 168.9 KJ/mol. The phenomenon of the double melting behavior was observed for the PCL block during melting process after nonisothermal crystallization, being the reflection of a complicated crystallization process and the existence of the amorphous middle PEG block. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009

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