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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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Dynamic mechanical analysis of poly(trimethylene terephthalate) - a comparison with poly(ethylene terephthalate) and poly(ethylene naphthalate)

Mackintosh, A.R. and Liggat, J.J. (2004) Dynamic mechanical analysis of poly(trimethylene terephthalate) - a comparison with poly(ethylene terephthalate) and poly(ethylene naphthalate). Journal of Applied Polymer Science, 92 (5). 2791 -2796. ISSN 0021-8995

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Abstract

The fiber properties of PTT have been the subject of several reports, although very few reports describe the properties of molded specimens. In this work, the dynamic mechanical relaxation behavior of compression-molded PTT films has been investigated. The added flexibility of the PTT was found to lower the temperature of the - and -transitions relative to the PET and PEN. The results suggest that the -transition is at least two relaxations for PET and PTT due to the increase in the breadth of the relaxation. The results seem to support the hypothesized mechanism of others, in that the -transition involves the relaxation of the carbonyl entity and the aromatic C1-C4 ring flips for PTT and PET, and the relaxation of the carbonyl for PEN. The *- and -transitions for all three polymers seem to be cooperative in nature.