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e-Polymers

Editor-in-Chief: Agarwal, Seema / Greiner, Andreas

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Volume 4, Issue 1

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Comparative dielectric studies of segmental mobility in novel polyurethanes

Michalis Roussos / Anna Konstantopoulou / Ioannis M. Kalogeras / Athanassios Kanapitsas
  • Department of Physics, National Technical University of Athens, Zografou Campus, 157 80 Zografos, Greece
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/ Polycarpos Pissis
  • Department of Physics, National Technical University of Athens, Zografou Campus, 157 80 Zografos, Greece
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/ Yuri Savelyev
  • Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, Harkivske shose 48, 02160 Kyiv, Ukraine
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/ Aglaia Vassilikou-Dova
Published Online: 2013-08-31 | DOI: https://doi.org/10.1515/epoly.2004.4.1.441

Abstract

Molecular dynamics in selected novel linear/low-branched polyurethanes (PUs), based on oligo(oxytetramethylene glycol), 4,4'-diphenylmethanediisocyanate (MDI) or 2,6-toluenediisocyanate (TDI), and unsymmetrical dimethylhydrazine (I) and a derivative of that (II) as chain extenders (CE), were studied by dielectric techniques. Special attention was paid to the investigation of the α relaxation, associated to the glass transition, by dielectric relaxation spectroscopy (DRS) and thermally stimulated depolarization currents (TSDC). The TSDC method was used to study the interfacial Maxwell-Wagner-Sillars (MWS) relaxation, related to the accumulation of charges at the interfaces between soft-segment and hardsegment microdomains. The results obtained by DRS and TSDC were in good agreement with each other and in reasonable agreement with results for the microphase separation (MS) obtained by small-angle X-ray scattering and differential scanning calorimetry. TSDC proved to be an attractive complementary technique to DRS for the study of MS in PUs. The results suggest that the position of the MWS band, as well as its separation from the α band, is a good measure of the degree of MS. As regards the PUs studied here, the degree of MS enhances by increasing the mole ratio of CE, and by replacing MDI by TDI or CE I by CE II.

About the article

Published Online: 2013-08-31

Published in Print: 2004-12-01


Citation Information: e-Polymers, Volume 4, Issue 1, 042, ISSN (Online) 1618-7229, ISSN (Print) 2197-4586, DOI: https://doi.org/10.1515/epoly.2004.4.1.441.

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