Study of relaxation mechanisms in structurally related biomaterials by thermally stimulated depolarization currents

Nery Suárez, Stephen Brocchini, Joachim Kohn

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10 Scopus citations

Abstract

Thermal-stimulated depolarization current (TSDC) experiments were performed on a series of tyrosine-derived polyarylates with different number of methylene groups in the backbone. The low temperature TSDC spectra (80-240 K) were analyzed at two different degrees of hydration to assess the effects of small amounts of loosely and tightly bound water in the observed complex β band. Higher temperature TSDC spectra (250-350 K) provided the α relaxation peaks associated with the glass transition temperature. The direct signal analysis (DSA) method allowed the deconvolution of the peaks into elementary processes and the determination of their mean relaxation parameters. The variations in the low and high temperature polarization with the number of backbone methylene groups were interpreted as a combination of flexibility and entanglement phenomena. The dielectric manifestation of the disentanglement effects was observed for the case of the longest polymer.

Original languageEnglish (US)
Pages (from-to)8671-8680
Number of pages10
JournalPolymer
Volume42
Issue number21
DOIs
Publication statusPublished - Jul 30 2001

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All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

Keywords

  • Hydration effects
  • Relaxations
  • Structurally related polyarylates

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