A thermally stimulated current technique for measuring the molecular parameters of Pebax, a polyether-block amide copolymer View Full Text


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Article Info

DATE

1987-02

AUTHORS

Hafiz S. Faruque, C. Lacabanne

ABSTRACT

The primary relaxation peaks of Pebax copolymer having a soft segment, poly (tetramethylene glycol) (PTMG)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$(\bar M_n = 2032)$$ \end{document} and a hard segment, polyamide 12 (PA12)\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document} $$(\bar M_n = 615)$$ \end{document} are located at −69.5 and 18° C for a raw sample and at −71.5 and 4° C when the sample is recrystallized after fusion using the thermally stimulated current (t.s.c.) method. A comparison is made of rapid and slow cooling t.s.c. on hard-segment molecules. Applying the fractional polarization method, the modesβPTMG andβPA have been analysed. The parameters (such as activation energy and relaxation time) associated with the dipolar relaxation process of Pebax have been calculated. The maximum energy observed for modesβPTMG andβPA is 1.47 eV at − 66° C and 1.34 eV at 1° Q respectively. The elementary processes that constitute the modesβPTMG andβPA obey a compensation law with compensation temperatureTc = −43° C and compensation relaxation time τc, = 3.4 x 10−2 sec for mode βPTMG, andTc = 66° C and τc = 2.8 x 1 0−4 sec for modeβPA. More... »

PAGES

675-678

References to SciGraph publications

  • 1981-03. Thermally stimulated depolarization currents of tactic polymethyl methacrylates and their mixtures in COLLOID AND POLYMER SCIENCE
  • 1979. Field-induced thermally stimulated currents in THERMALLY STIMULATED RELAXATION IN SOLIDS
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    http://scigraph.springernature.com/pub.10.1007/bf01160787

    DOI

    http://dx.doi.org/10.1007/bf01160787

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