AFMを用いた粘着剤はく離強度の速度依存性の解明

抄録

Release energy of PSA (Pressure-Sensitive Adhesive) is strongly related to fibril formation, but it has not been characterized in detail because the measured adhesive force depends on the experiments conditions such as the separation rate and the layer thickness. In this study, the load-displacement relationship was obtained by AFM (Atomic Force Microscope) to investigate the fracture of single fibril. The maximum adhesive forces were measured by various release rates to examine the strain rate dependence of fibril separation. In addition, the test was repeated without cleaning the cantilever of AFM to clarify the remains of PSA on cantilever surface and to relate to separation mode. As a result it was found that separation occurs at the interface between cantilever and PSA surface at higher release rate, whereas PSA shows cohesive fracture at lower release rate.