Influence of water content, time, and temperature on the rheological behavior of polyethylene terephtalate

Authors

  • A. M. C. Souza,

    1. Metallurgical and Materials Engineering Department, Escola Politécnica - São Paulo University, Av. Prof. Mello Moraes, 2463 CEP, São Paulo 05508-900, SP, Brazil
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  • D. S. Leprêtre,

    1. Département Technologie des Polymères et Composites et Ingénierie Mécanique, Ecole des Mines de Douai, 941, rue Charles Bourseul BP 10838, Douai Cedex 59508, France
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  • N. R. Demarquette,

    Corresponding author
    1. Metallurgical and Materials Engineering Department, Escola Politécnica - São Paulo University, Av. Prof. Mello Moraes, 2463 CEP, São Paulo 05508-900, SP, Brazil
    • Metallurgical and Materials Engineering Department, Escola Politécnica - São Paulo University, Av. Prof. Mello Moraes, 2463 CEP, São Paulo 05508-900, SP, Brazil
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  • M. F. Lacrampe,

    1. Département Technologie des Polymères et Composites et Ingénierie Mécanique, Ecole des Mines de Douai, 941, rue Charles Bourseul BP 10838, Douai Cedex 59508, France
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  • P. Krawczak

    1. Département Technologie des Polymères et Composites et Ingénierie Mécanique, Ecole des Mines de Douai, 941, rue Charles Bourseul BP 10838, Douai Cedex 59508, France
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Abstract

In this work, the main factors affecting the rheological behavior of polyethylene terephtalate (PET) in the linear viscoelastic regime (water content, time delay before test, duration of experiment, and temperature) were accessed. Small amplitude oscillatory shear tests were performed after different time delays ranging from 300 to 5000 s for samples with water contents ranging from 0.02 to 0.45 wt %. Time sweep tests were carried out for different durations to explain the changes undergone by PET before and during small amplitude oscillatory shear measurements. Immediately after the time sweep tests, the PET samples were removed from the rheometer, analyzed by differential scanning calorimetry and their molar mass was obtained by viscometry analysis. It was shown that for all the samples, the delay before test and residence time within the rheometer (i.e. duration of experiment) result in structural changes of the PET samples, such as increase or decrease of molar mass, broadening of molar mass distribution, and branching phenomena. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010

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