RADICAL-CATIONIC HYBRID UV-CURABLE ADHESIVES

Liu Hongbo，Zhang Wuying and Lin Feng

(School of Applied Chemistry and Biological Technology，Shenzhen Polytechnic，Shenzhen 5 1 805 5，Guangdong，China)

Abstract：New radical-cationic hybrid UV-curable polyurethane modified epoxy monoacrylates(PME—MA)were synthesized．The resin PMEMA and the change of absorption peaks of double bond and epoxy group during hybrid UV curing process were identified by Fourier Transform Infrared spectra．The hybrid UV-curable adhesives were prepared with different kinds of active diluents．The gel content，volume shrinkage，shearing strength and relative elongation of the radical-cationic hybrid cured films were investigated．The gel content of hybrid UV-cured films of PMEMA systems exceeded 97％，its volume shrinkage was less than 5．8％and shearing strength was beyond 1．66 MPa．Comparing with epoxy monoacrylates hybrid UV-cured films。the relative elongation of PMEMA hybrid UV-cured films increased by 60％．

Key words：UV-curable；radical；cationic；adhesive；polyurethane-modified epoxy monoacrylates