Abstract
Polymerization behavior of epoxides initiated with benzoyl group containing sulfonium salts with PF6- anion was evaluated. Polymerization rate was related to molecular orbital calculations (MOPAC program with AM1 parameter) and Hammett constant. Polymerization activity of the sulfonium salts having substituents at the p-position of benzoyl group was as follows ; NO2 (4-NBPBS・PF6) > H (4-HBPBS・PF6) > CH3O (4-MOBPBS・PF6) ≈CH3 (4-MBPBS・PF6). In the crosslinking with 4-NBPBS・PF6, yellowish networked polymer was obtained. Based on these results, 4-HBPBS・PF6 is expected to be the most promising salt as a novel thermally latent polymerization initiator for electronic materials.
