Effects of hydrocarbon tackifiers on the adhesive properties of contact adhesives based on polychloroprene. II. Nature of the hydrocarbon tackifier

Abstract

50 phr each of three hydrocarbon resins of different aliphatic-aromatic nature was added to a solvent based polychloroprene adhesive. The hydrocarbon resins were characterized using infra-red (IR) spectroscopy and differential scanning calorimetry (DSC) measurements. The properties and compatibility of the polychloroprene/ resin blends were studied using thermal mechanical analysis (TMA), DSC, scanning electron microscopy (SEM) and rheology. Tack measurements were carried out, and the joint strength was obtained from T-peel tests of roughened styrene-butadiene rubber-polychloroprene adhesive joints. The addition of aromatic hydrocarbon resins produced a compatible resin-polychloroprene blend, whereas an incompatibility was obtained between an aliphatic hydrocarbon resin and the polychloroprene. The compatibility of aromatic hydrocarbon resin-polychloroprene blends was responsible for the enhanced tack and improved adhesion to roughened rubber materials. On the other hand, the incompatibility of aliphatic ...