Effects of hydrocarbon tackifiers on the adhesive properties of contact adhesives based on polychloroprene. I. Influence of the amount of hydrocarbon tackifier

Abstract

Amounts between 20 and 120 phr of an aromatic hydrocarbon resin were added to a solvent-based polychloroprene adhesive. The hydrocarbon resin was characterized using infra-red (IR) spectroscopy and differential scanning calorimetry (DSC) measurements. The properties and compatibility of the polychloroprene/resin mixture were studied using contact angle measurements, mechanical tests, DSC, thermal mechanical analysis (TMA), and rheology. Tack measurements were also carried out, and the adhesion strength was obtained from T-peel tests on roughened styrene-butadiene rubber/polychloroprene adhesive joints. The addition of resin produced an increase in the contact angle, and a decrease in the mechanical and viscoelastic properties of the adhesives. For amounts of resin lower than 50 phr, there was adequate compatibility with polychloroprene, which could be the reason for the improved tack and practical adhesion of the polychloroprene adhesives. Amounts of resin higher than 50 phr produced a lesser degree of co...