Dismantling Behavior of Pressure Sensitive Adhesives Using Acrylic Block and Random Copolymers in Response to Photoirradiation and Postbaking

抄録

The formation of void between a PET support film and an adhesive layer is one of the reasons for the PET interfacial failure of B1 (PtBA_w-b-(tBA_x-co-2EHA_y-co-HEA_z)) after the dismantling. However, a major part of B1 specimens was occupied by pillar-like structures, even where PET interfacial failure was observed. It seems that the macroscopic morphology of adhesive layers is not only factors to determine failure modes. Although both R1 (P(tBA_x-co-2EHA_y-co-HEA_z) and the soft segment of B1 have much lower T_g than room temperature, their mechanical properties seems to be different after the dismantling treatment as being indicated by ΔC_p values. The fact that B2 is resulted in cohesive failure in spite of very low peel strength after the dismantling suggests the important role of cross-linking on cohesive force.