Electron-beam curing of epoxy resins: Effect of alcohols on cationic polymerization |
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| Authors: | N N Ghosh G R Palmese |
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| Affiliation: | (1) Chemistry Group, Birla Institute of Technology and Science, Pilani (Goa Campus), Zuarinagar, 403 726 Goa, India;(2) Department of Chemical Engineering, Drexel University, USA |
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| Abstract: | Electron-beam (e-beam) induced polymerization of epoxy resins proceeds via cationic mechanism in presence of suitable photoinitiator.
Despite good thermal properties and significant processing advantages, epoxy-based composites manufactured using e-beam curing
suffer from low compressive strength, poor interlaminar shear strength, and low fracture toughness. A detailed understanding
of the reaction mechanism involving e-beam induced polymerization is required to properly address the shortcomings associated
with e-beam curable resin systems. This work investigated the effect of hydroxyl containing materials on the reaction mechanism
of e-beam induced cationic polymerization of phenyl glycidyl ether (PGE). The alcohols were found to play important roles
in polymerization. Compared to hydroxyl group of aliphatic alcohol, phenolic hydroxyl group is significantly less reactive
with the oxonium active centre, generated during e-beam induced polymerization of epoxy resin system. |
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| Keywords: | E-beam cationic polymerization epoxy resin size exclusion chromatogram |
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