# CURING STUDY OF A TOUGHENED EPOXY SYSTEM USING THE DYNAMIC TORSIONAL VIBRATION METHOD

> Title: CURING STUDY OF A TOUGHENED EPOXY SYSTEM USING THE DYNAMIC TORSIONAL VIBRATION METHOD Page Range: p.719-726 Author(s): Chen Dazhu; Yuan Fang; He Pingsheng; Quian Jiasheng File size: 178K Download the pdf (subscribers only) Buy the pdf (non-subscribers) Journal: Polymers and Polymer...

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Published: 2004-08-01T00:00:00+00:00
Categories: Polymers and Polymer Composites

**Title: CURING STUDY OF A TOUGHENED EPOXY SYSTEM USING THE DYNAMIC TORSIONAL VIBRATION METHOD**
 Page Range: p.719-726
 Author(s): Chen Dazhu; Yuan Fang; He Pingsheng; Quian Jiasheng
 File size: 178K
 ![](http://dload.gif) [Download the pdf](http://journals.asp?Page=111&JournalDownload=ON&JournalType=ppc&JournalIssue=ppc12-8&JournalID=100182&JIP=) (subscribers only)
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 Journal: Polymers and Polymer Composites
 Issue Year: ppc
 Volume: 12
 Issue No: No. 8

**Abstract**
 A study is reported of the cure kinetics of an epoxy/polyamide system using the dynamic torsional vibration method, by measuring the change in mechanical properties (torque) during the cure. The experimental data were analysed by the non-equilibrium thermodynamic fluctuation theory and the Avrami method. Results from dynamic mechanical thermal analysis indicated that the fully cured specimens of epoxy resin/polyamide exist in the rubbery plateau state at the applied cure temperature, and that with increasing cure temperature, the equilibrium torque dropped, the gel time decreased and the cure reaction took less time to complete. After the gel point, the same curing mechanism occurred at various cure temperatures. Also investigated was the effect of increasing the hardener concentration on the rate of crosslinking at a given cure temperature. Excess polyamide was shown to increase the number of crosslinking points, and hence, enlarged the Avrami exponent. 18 refs.

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