SURFACE RESISTIVITY OF CARBON NANOTUBE FILLED PRESSURE SENSITIVE ADHESIVE AFTER ANNEALING PROCESS

Abstract

Pressure-sensitive adhesives (PSAs) exhibit adhesive properties upon applying light pressure. The light pressure adhesion of PSAs makes them suitable for potential applications in electronic packaging. However, to apply PSAs in electronic packaging, it is essential for them to possess electrostatic discharge (ESD) properties and high clarity. The attainment of ESD properties in PSAs can be achieved by either mechanically incorporating conductive fillers or chemically functionalizing the PSA compound. In this study, we aimed to achieve electrostatic discharge (ESD) properties in PSA using CNT as a conducting filler. CNT was selected for its strong conductivity compared to carbon black (CB). To accomplish this, CNT was mixed into the PSA formulation, which contained Chivacure 300 as a photoinitiator, silicone-urethane acrylate as an oligomer, and 2-ethyl-hexylacrylate and methyl methacrylate as monomers. The resulting PSAs were then coated onto polyethylene terephthalate (PET) film and cured with Ultraviolet light-emitting diode (UV-LED) light. However, the effect of CNT content on achieving a balance between ESD properties was insignificant. Therefore, an annealing process was introduced further to enhance the electrostatic discharge properties of the PSA. After the annealing process, it was found that PSAs with 0.75 phr of CNT achieved the desired electrostatic discharge (ESD) properties. Therefore, we examined the impact of the annealing process on the electrostatic properties and found that the inclusion of the annealing process significantly improved the electrostatic properties of pressure sensitive adhesives.