Fabrication and capacitive sensing performance of acrylate/nickel/polyaniline conductive composite pressure-sensitive adhesive.

In this study, the conductive pressure-sensitive adhesive was prepared through multiple solution casting. Chain spherical nickel powders (C-Ni), flake nickel powders (F-Ni) and polyaniline (PANI) were incorporated as functional fillers into the resultant acrylic type pressure-sensitive adhesive (a-PSA). The results indicated that these fillers were asymmetrically distributed in the thickness direction of the conductive pressure-sensitive adhesive due to the effect of gravity. This significantly improved the electrical properties of the resultant composite pressure-sensitive adhesive. The a-PSA/10 wt% C-Ni/1 wt% PANI composite adhesive exhibited the highest conductivity of 0.013 S/m. With increasing the PANI content, there was an increase in the response of the capacitance to bending angle and pressure of the composite adhesives. The most sensitive response to bending angle was observed for the composite adhesives containing 1 wt% PANI. At a pressure of 12.5 kPa, the change rate of capacitance of the composite adhesive reached 1.83. Its tensile strength was 2.88 times as much as that of the a-PSA, whereas its adhesion strength decreased with an increase in the filler content. The a - PSA/10 wt% C - Ni/1 wt% PANI composite adhesive exhibited the best comprehensive performance. [ABSTRACT FROM AUTHOR]