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Electron beam and UV cationic polymerization of glycidyl ethers PART II: Reaction of diglycidyl ether of bisphenol A
Author(s) -
Mascioni Matteo,
Ghosh Narendra N.,
Sands James M.,
Palmese Giuseppe R.
Publication year - 2013
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39189
Subject(s) - diglycidyl ether , cationic polymerization , epoxy , polymerization , polymer chemistry , materials science , bisphenol a , photopolymer , chemical engineering , chemistry , photochemistry , polymer , composite material , engineering
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. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013