Abstract
The polyaddition reaction of 1, 3, 5-trisglycidyloxybenzene (TGOB) with 3, 3-bis (4-carboxylphenyloxymethyl) oxetane (CPOMO), methacrylic acid (MAA), and 3-carboxyl-3-ethyloxetane (CEO) was carried out in the presence of tetrabutylammonium bromide (TBAB) as a catalyst at 90°C for 18 h to give the hybrid hyperbranched polymer (HBP-OX-MA-CA) (Mn's = 5200, Mw/Mn=2.21) with terminal oxetanyl, methacryloyl, and carboxyl groups in 80 % yield. Certain curing reactions of HBP-OX-MA-CA were performed in the film state using appropriate photo-acid generator, photo-radical initiator, or tetraphenylphosphonium iodide (TPPI) as a catalyst to give the corresponding cured films. The thermal properties of resulting cured films were examined, and it was found that hybrid cured film by photo-initiated radical polymerization + photo-initiated cationic polymerization + thermal reaction of oxetane groups with carboxyl groups showed higher Tg than the other cured films by each reaction such as photo-initiated radical polymerization, photo-initiated cationic polymerization, and thermal reaction of oxetane groups with carboxyl groups.
