Australian Journal of Chemistry Australian Journal of Chemistry Society
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Temperature Dependent Stress Relaxation in a Model Diels–Alder Network

Richard J. Sheridan A , Brian J. Adzima A and Christopher N. Bowman A B
+ Author Affiliations
- Author Affiliations

A Department of Chemical and Biological Engineering, University of Colorado, Boulder, CO 80309-0424, USA.

B Corresponding author. Email: christopher.bowman@colorado.edu

Australian Journal of Chemistry 64(8) 1094-1099 https://doi.org/10.1071/CH11176
Submitted: 1 May 2011  Accepted: 18 July 2011   Published: 19 August 2011

Abstract

The effect of temperature on the complex shear modulus (G*(ω)) of a model reversible covalent network formed by the Diels–Alder reaction was studied. The gel temperature of 119°C and the functional group conversion at this temperature were determined by the Winter–Chambon criterion. The complex modulus of the cross-linked network was measured from 110°C to 121°C, near the gel temperature, to determine the frequency ranges over which stress relaxation could occur. The crossover time was found to have a strong dependence on temperature (Ea ~ 260 kJ mol–1); greater than would be expected from a typical thermally-activated retro-Diels–Alder process. Low frequency scaling of G*(ω) over the experimental frequency and temperature range was interpreted to be a result of the existence of a distribution of transient clusters in these thermoreversible covalent gels.


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