부산대학교 도서관

The effect of tackifier on the adhesive property of the pressure sensitive adhesive tape was investigated. For this purpose, a model system consisting of polystyrene-polyisoprene-polystyrene tri-block copolymer as base polymer and a typical aliphatic petroleum resin as tackifier was prepared. The tackifier content ranged from 10 to 60wt%. The tackifier used has good a compatibility with polyisoprene, whereas, it has a poor compatibility with polystyrene. The 180°peel adhesion was measured. The peel adhesion increased with the tackifier content, while the degree of increase became significantly above 40wt%. The pressure sensitivity appeared clearly and the maximum peel adhesion obtained without heating above 40wt%. The phase structure was determined using pulsenuclear magnetic resonance, transmission electron microscope and dynamic mechanical analysis. The phase structure that the spherical polystyrene domains having the mean size of about 20nm were dispersed in the polyisoprene continuous phase was observed. The formation of tackifier-rich phase of the order of nm in the polyisoprene matrix was observed and the amount increased with the tackifier content. The tackifier-rich phase seemed to develop the cohesive strength of the pressure sensitive adhesive, and thus it increased the peel adhesion.