“Cool-off” Function and Heat Resistance of an Acrylic Pressure Sensitive Adhesive Bearing a Mesogenic Group

We have prepared an acrylic pressure sensitive adhesive bearing a mesogenic group (MesP) as a thermosensitive unit and heat resistance one. MesP showed a "cool-off" function, where MesP loses its adhesion below the glass transition temperature and gives enough adhesion above that. Remarkably, peel modes of MesP at 250 °C and 20 °C after heating at 250 °C were adhesive failure that means interfacial failure between the PSA and adherent whereas those of an acrylic pressure sensitive adhesive bearing a long-alkyl side-chain group (C22P) were cohesive failure (CF) and a mixture of CF and stick-slip, respectively.