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Relaxations IN amorphous and semi-crystalline polyesters

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Abstract

Thermally stimulated depolarization currents and differential scanning calorimetry are performed on thermoplastic polyesters to characterize both a and b relaxations. The influence on the different relaxations phenomena of the chemical structure (size of the naphthalene groups, presence of cyclohexane, length of the aliphatic group, ...) as well as the influence of the crystallinity are discussed. The three phases model with a crystalline part, a rigid amorphous part unable to relax and an amorphous phase able to relax at various temperatures depending on the distribution of the relaxation times is used to explain the evolution of the main α relaxation while the standard two-phases model is sufficient to explain the variations of the β relaxation mode. Elementary analysis of both α and β relaxations show that the β relaxation characterized by a continuous variation of activation energies as a function of temperature follows the activated state equation with a zero activation entropy while the cooperative a relaxation exhibits a prominent maximum of the activation energies at the glass transition temperature.

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Authors and Affiliations

  1. AECS Damas, P.O. Box 6091, Syrie

    M. Kattan

  2. 76821 Laboratoire d'Etude et de Caractérisation des Amorphes et des Polymeres, Université de Rouen, Site du Madrillet UFR Sciences Laboratoire d'Etude et de Caractérisation des Amorphes et des Polymeres Avenue de l'Université, BP 12, 76801, Saint Etienne du Rouvray, France

    E. Dargent & J. Grenet

Authors
  1. M. Kattan
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  2. E. Dargent
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  3. J. Grenet
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Correspondence to J. Grenet.

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Kattan, M., Dargent, E. & Grenet, J. Relaxations IN amorphous and semi-crystalline polyesters. Journal of Thermal Analysis and Calorimetry 76, 379–394 (2004). https://doi.org/10.1023/B:JTAN.0000028019.88096.e3

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