カーボンナノチューブを添加した導電性粘着剤の設計

Abstract

Multi-walled carbon nanotube (MWCNT)-polymer nanocomposites are attracting great attention because of their ability to form conducting networks, which is attributed to their high aspect ratios. We investigated the factors that affect MWCNT dispersibility and electro conductivity of Pressure sensitive adhesive (PSA) in order to design conductive PSAs using MWCNT. The surface free energy of PSAs greatly influenced on the MWCNT dispersibility and conductivity of the conductive PSAs. The smaller interaction between PSA and MWCNT induced the formation of more conductive network by MWCNT agglomerates and provides higher conductive composites with low MWCNT loading. Also, we investigated the influence of the kind and quantity of added tackifier (TF) on the phase structure and electrical conductivity of polyurethane (PU) PSAs containing MWCNT. When TF having low compatibility with PU was incorporated, sea-island structure was formed. In the case of higher TF content, the sea component was composed of TF having high affinity MWCNT. As a result, dispersibility of MWCNT and conductivity of the composite were enhanced. Based on our results, we designed highly conductive PSAs by adding MWCNT to silylated urethane PSAs.