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Electron beam and UV cationic polymerization of glycidyl ethers PART II: Reaction of diglycidyl ether of bisphenol A
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Electron beam and UV cationic polymerization of glycidyl ethers PART II: Reaction of diglycidyl ether of bisphenol A

Matteo Mascioni, Narendra N. Ghosh, James M. Sands and Giuseppe R. Palmese
Journal of applied polymer science, v 130(1), pp 487-495
05 Oct 2013
DOI: https://doi.org/10.1002/app.39189

Abstract

Physical Sciences Polymer Science Science & Technology
Electron-beam (e-beam) and ultraviolet (UV)-induced cationic polymerization of diglycidyl ether of bisphenol A (DGEBA) using the photo-initiator diaryliodonium hexafluoroantimonate was investigated using in situ NIR spectroscopy. The effect of processing parameters, such as temperature, radiation intensity, and photo-initiator concentration, on kinetics of the reaction were determined quantitatively. In contrast to the behavior of monofunctional epoxy systems reported previously, the difunctional epoxy forms a high T-g crosslinked network, so a kinetic model that takes into account diffusion limitations associated with vitrification was developed. The combined benefits of the real-time in situ NIR spectroscopy study and the well-defined diffusion model resulted in very accurate predictions for cure of epoxy networks by e-beam-induced polymerization. The results support the view that e-beam processing of epoxies is constrained by vitrification in the same way that UV and thermally cured epoxies are. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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Polymer Science
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