Journal
AUSTRALIAN JOURNAL OF CHEMISTRY
Volume 64, Issue 8, Pages 1094-1099Publisher
CSIRO PUBLISHING
DOI: 10.1071/CH11176
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Funding
- NSF [CBET-0933828]
- Department of Education
- Directorate For Engineering [0933828] Funding Source: National Science Foundation
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The effect of temperature on the complex shear modulus (G*(omega)) of a model reversible covalent network formed by the Diels-Alder reaction was studied. The gel temperature of 119 degrees 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 degrees C to 121 degrees 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 similar to 260 kJ mol(-1)); greater than would be expected from a typical thermally-activated retro-Diels-Alder process. Low frequency scaling of G*(omega) 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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