Curing Kinetics of Anisotropic Conductive Adhesive in the Manufacturing Process of RFID Tags

Abstract

The study of the epoxy-based anisotropic conductive adhesive in electronic packaging interconnects applications (chip-on-glass, chip-on-flex, etc. especially in RFID applications) has received particular attention. This is due to its potential advantages of finer pitch printing, reducing environmental contamination. The thermal curing process is critical to develop the ultimate electrical and mechanical properties of the ACA devices. In this article, the curing kinetics of ACA was studied with a differential scanning calorimeter (DSC) under constant heating rates conditions in the range of 520 °C/min. The model free method was used to describe the curing reaction. The degree-of-cure and the activation energy through the whole conversion range were mathematically determined and used to predict the progress of the curing process. Experimental results show that the activation energy of the ACA varies significantly with degree-of-cure during the curing process. The peculiar phenomenon indicates that the ACA underwent a complex series of reactions. The kinetics of curing reaction changes when large conversion values are reached at low heating rates. The change in the reaction kinetics is due to vitrification of the ACA during heating. In addition, the degree-of-cure of the ACA as a function of bonding times during isothermal ACA bonding process was theoretically predicted.

Effect of flip-chip bonding parameters on the property of passive UHF RFID tags with screen-printed antenna on fabric

“…The initial heating contactor temperature was set at about 120 C after consideration of the low temperature endurance of the substrate fabric with nylon filament (glass transition temperature, Tg < 170 C) and previous experiments. 18,[21][22][23] Several heating temperatures (80, 100, 120, 140, 160 C), heating duration times (4, 6, 8, 10, 12, 14, 30 s) and contactor pressures (0.3, 0.7, 1.1, 1.5, 1.9 N) were used in this experiment to reveal their influence on the reading performance of UHF RFID tags, respectively, and the effect mechanism of bonding parameters was discussed.…”

“…The initial heating contactor temperature was set at about 120°C after consideration of the low temperature endurance of the substrate fabric with nylon filament (glass transition temperature, Tg < 170°C) and previous experiments. 18,21–23…”

“…17 also observed that an increase in heating temperature helped to form necks between particles and improved the conductivity to some extent. Fan 18 used the ACA for antenna–microchip interconnection. Their study showed that ACA requires a curing degree of 88%, a curing time of 13.5 s, a bonding pressure of 2 N, and a combination temperature of 185°C/165°C for the upper/lower thermal head.…”