Electrical property of electrically conductive adhesives filled with micro-sized Ag flakes and modified by dicarboxylic acids

In the present study, several conventional dicarboxylic acids (e. g., oxalic acid, malonic acid, succinic acid, adipic acid and glutaric acid) are selected to modify electrically conductive adhesives (ECAs) filled with micro-sized silver flakes, and so-designed ECAs have been prepared. In so-designed and prepared ECAs, dicarboxylic acids take in effect through in-situ replacement of surfactant so as to improve the contact of silver flakes and their distribution and consequently to enhance the electrical property of the ECAs. The curing behavior of the prepared ECAs with adding different dicarboxylic acids is characterized by a differential scanning calorimeter, the bulk resistivity of the ECAs is evaluated by a high-speed programmable micro-ohmmeter and the morphologies of the ECAs are analyzed by SEM. The results show that adipic acid can be a very good additive not only facilitating the curing with an obvious increase of the reaction heat, but also improving the electrical property of the ECAs with a significant reduction of the bulk resistivity.