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Theoretical prediction of physical properties of network glasses versus extent of cure

✍ Scribed by Xiaorong Wang

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
175 KB
Volume
64
Category
Article
ISSN
0021-8995

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✦ Synopsis

A theoretical model was developed for describing the behavior of isothermal properties vs. the extent of cure for thermosetting glasses. The consideration follows the two-state Gibbs-DiMarzio (GD) theory of the glass transition. Network formation is considered on the basis of only interconnected trifunctional crosslinked sites using the Flory's mean-field theory of gelation. Theoretically, the proposed model predicts that the fraction of hole volume (v 0 ) in the glassy state and the difference of expansion coefficient ( Da) between glass and liquid pass through a minimum with increasing extent of cure for thermosetting materials. These results suggest that the isothermal density and modulus will pass through a maximum with increasing extent of cure. Experimental data support the theoretical results. A discussion of the mechanism is included.

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