Study of gelation using differential scanning calorimetry (DSC) |
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Authors: | Jiawu Gao Lin Li Yanping Deng Zongming Gao Changhua Xu Mingxi Zhang |
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Institution: | (1) Beijing University of Aeronautics and Astronautics, 100083 Beijing, China;(2) The Perkin-Elmer Corporation, 50 Danbury Road, 06897 Wilton, CT, USA;(3) State Key Laboratory of Engineering Plastics, Institute of Chemistry, Academia Sinica, 100080 Beijing, China |
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Abstract: | A new method for determining the degree of conversion of gelation ( gel) and gel time (t
gel) at gel point using a single technology, DSC, is discussed in this work. Four kinds of thermoset resins are evaluated. It is found that the mutation points of reduced reaction rate (V
r
) vs. reaction conversion ( ) curves, corresponding with the changes of reaction mechanism, represents the gelation of the reaction. The at the mutation point is defined as gel. From isothermal DSC curves, the point at gel is defined ast
gel. Traditional techniques (ASTM D3532 and DSC method) are also used to determine gel andt
gel in order to demonstrate this new method. We have found that the results obtained from this new method are very consistent with the results obtained from traditional methods. |
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Keywords: | curing DSC epoxy gel time gelation |
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