Thermal Initiators for Cationic Polymerization of Epoxy Containing Monomers Applicable for Anisotropic Conductive Films
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초록
내용
An epoxy adhesive provides excellent mechanical properties, thermal stability, and chemical resistance. One of the examples of epoxy adhesive is an anisotropic conductive film (ACF) consisting of epoxy resin, curing agent, and conductive particle. ACF is heated and pressurized to adhere both circuits. For the process, it is crucial to control temperature for initiation because excess heating exhibits a negative effect to the circuits. However, lowering the temperature is not always favored as initiator can occur undesirable reaction before actual use. Therefore, it’s essential to cationically initiate polymerization under specific conditions. Here, we demonstrate how the variation of the structure of thermal initiator affects the polymerization and curing behaviors of epoxy containing monomers. We synthesize various initiator having different structures to examine the effect of the structures of the cations and anions of the initiators. The differences in polymerization behaviors of the thermal cationic initiators for a certain epoxy monomer were examined using various tools.