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Influence of the mixing time on the phase structure and glass-transition behavior of poly(ethylene terephthalate)/poly(ethylene-2,6-naphthalate) blends

Authors

  • Wang Tao,

    1. Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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  • Wu Wei,

    Corresponding author
    1. Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
    • Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Technology, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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  • Chen Yu,

    1. Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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  • Wu Ren,

    1. Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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  • Luo Qiaoling

    1. Sino-German Joint Research Center of Advanced Materials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China
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Abstract

Blends of poly(ethylene terephthalate) and poly(ethylene-2,6-naphthalate) (70 : 30 w/w) were prepared via a melt-mixing process at 280°C with various mixing times. The melt-mixed blends were analyzed by magnetic resonance spectroscopy, differential scanning calorimetry, dynamic mechanical measurements, transmission electron microscopy, and tensile tests. The results indicate that the blends mixed for short times had lower extents of transesterification and were miscible to a limited extent. The blends initially show two glass transitions, which approached more closely and merged gradually with increasing mixing time. A mechanical model was used to help understand the glass-transition behavior. With increasing mixing time, the phase structure of the blends improved, and this led to an increase in the tensile strength. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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