Abstract
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 Tg 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.
Original language | English (US) |
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Pages (from-to) | 487-495 |
Number of pages | 9 |
Journal | Journal of Applied Polymer Science |
Volume | 130 |
Issue number | 1 |
DOIs | |
State | Published - Oct 5 2013 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- General Chemistry
- Surfaces, Coatings and Films
- Polymers and Plastics
- Materials Chemistry