Influence of Titanate and Zirconate Coupling Agents in Epoxy Underfill Material

摘要

This paper presents the investigation on effect of five titanate and zirconate coupling agents (CA) with different functional groups on various properties of epoxy underfill materials including viscosity, curing, thermo-mechanical property, and adhesion to SiO_2 passivation. CA-A, CA-C, and CA-E increased the viscosity of underfill. Addition of the coupling agents led to decrease in the curing onset temperature of epoxy underfill formulation. All of the coupling agents investigated in this study also brought a slight decrease in glass transition temperature (T_g) of epoxy underfill. The die shear test of underfill on SiO_2 passivation showed that the adhesion was not changed significant with the addition of those titanate and zirconate coupling agents except for CA-E. Influence of concentration of coupling agent CA-E in underfill materials was further investigated. CA-E has a potential to be used in epoxy underfill to improve the adhesion.