Shelf-Life Studies on B-Stage Novolac Epoxy Glass Mica Tapes |
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| Authors: | Vimala Sitaraman P. G. Agashe K. M. Kamath S. Sankaralingam K. Kishore |
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| Affiliation: | 1. BHEL Corporate R &2. D Division , Hyderabad, India;3. Department of Inorganic and Physical Chemistry , Indian Institute of Science , Bangalore, India |
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| Abstract: | Activation energy for the curing process of epoxy glass mica tape has been experimentally determined from differential scanning calorimetric measurements and found to be 20 kcal/ mol. Thermochemical calculation shows that the rate controlling step is the dissociation of the C-O bond in the epoxide leading to ring opening and its subsequent reaction with amine hardener. Shelf life has been determined from the measurement of the enthalpy loss corresponding to the curing during the aging process. The kinetics of the aging process also yields an activation energy of 20 kcal/mol which corresponds to the slow curing of the epoxy resin. |
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| Keywords: | Perfluorotriethylene Glycol Dimethacrylate Refractive Index Viscosity Degree of Conversion Water Sorption Contact Angle |
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