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Effect of Cationic Initiator Content on Electron-beam Curing of Difunctional Epoxy Resin
Effect of Cationic Initiator Content on Electron-beam Curing of Difunctional Epoxy Resin
Journal of the Korean Chemical Society. 2003. Jun, 47(3): 250-256
  • Published : June 20, 2003
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Park, Soo-Jin
Heo, Gun-Young
Lee, Jae-Rock
Suh, Dong Hack

Abstract
In this work, the effect of cationic initiator content on the electron-beam (EB) curing process of diglycidylether of bisphenol-A (DGEBA) resin was studied using near-infrared spectroscopy (NIRS), thermogravimetric analysis (TGA), and critical stress intensity factor $(K_{IC})$. Benzylquinoxalinium hexafluoroantimonate (BQH) were used as an initiator and its content was varied from 0.5 to 3 phr. NIRS measurements showed that the hydroxyl group of EB-cured epoxy resin was increased with increasing the BQH content. Thermal stability and $K_{IC}$ value of EB-cured epoxy resin were increased with increasing the BQH content but were decreased above 2 phr content. These results could be attributed to the decrease of the conversion and degree of crosslinking. In another word, the conversion and degree of crosslinking were restricted by the incomplete network structure from high reactivity at the BQH content above 2 phr, resulting in decreasings of thermal stability and $K_{IC}$.
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