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Dynamic mechanical behavior of fluorinated aromatic poly(ethers)

✍ Scribed by A. A. Goodwin; F. W. Mercer

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
190 KB
Volume
35
Category
Article
ISSN
0887-6266

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✦ Synopsis

The relaxation behavior of six fluorinated aromatic poly(ethers) was investigated using dynamic mechanical analysis. The glass transition temperature was found to increase as the size and rigidity of linking groups increased and varied between 168ЊC for a dimethyl linking group and 300ЊC for a bicyclic benzoate ether-linking group. For the a-relaxation the steepness of time/temperature plots and broadness of the loss curves could be qualitatively correlated with chemical structure in a manner predicted by the coupling model of relaxation. Well-separated sub-T g transitions were also observed, as a shoulder on the low temperature side of the a-peak, and as a broad, low loss transition around 0100ЊC. The higher temperature process was similar to the structural relaxation often found in quenched glassy polymers, while the position, intensity, and breadth of the subambient process was sensitive to chemical structure.

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