Abstract
In the UV cured cycloaliphatic epoxy resins consisting of 3,4-epoxycyclohexylmethyl-3′,4′-epoxycyclohexane carboxylate and triphenylsulfonium hexafluoroantimonate (TPSHA), which is a photoinitiator for cationic polymerization, the TPSHA residue was found to act as plasticizer above the initiator concentration of approximately 2 wt%, while act as antiplasticizer below this concentration. The photoreactivity of the uncured samples was investigated by using differential scanning calorimetry and tack free time measurements, and the physical properties of the UV cured samples were investigated by using dynamic mechanical measurements, thermal gravimetry, and high-resolution solid-state 13C NMR spectroscopy. Although no significant difference in the chemical structure was detected for the cured samples containing various concentrations of the photoinitiator, ranging 0.5 to 9 wt%, the TPSHA concentration had a strong influence on the thermal stability and the glass-transition temperature of the samples. The 13C NMR spin-lattice relaxation time and spin-lattice relaxation time in the rotating frame provided information on the molecular motions of the epoxy polymers, which indicates the plasticization and antiplasticization effects of the TPSHA residue.
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Udagawa, A., Yamamoto, Y., Inoue, Y. et al. Physical Properties and Photoreactivity of Cycloaliphatic Epoxy Resins Cured by UV-Induced Cationic Polymerization. Polym J 23, 1081–1090 (1991). https://doi.org/10.1295/polymj.23.1081
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DOI: https://doi.org/10.1295/polymj.23.1081