Abstract
Abstract This study involved the determination of the work of adhesion (Wa) to separate neoprene rubber from structural steel, using different formulations of room temperature cured dibromobutadiene (DBBD) as the adhesive system. The Wa of both the metal-to-adhesive (M-A) and rubber-to-adhesive (R-A) interface was determined by 180° peel tests at constant rate and temperature. The results of this investigation have shown that the level of adhesion can be controlled through the formulation of DBBD with different ratios of the curing agent MPEHA. The work of adhesion was found to increase with increasing crosslink density, but eventually reached a maximum value at an optimum crosslink density or molecular weight between crosslinks. Formulations containing an optimum level of the accelerator lead dimethyl-dithiocarbamate (Ledate) and organosilane coupling agent Z-6032 had a synergistic effect on the system. This optimum formulation was cured in 3 days and yielded values of Wa for the R-A interface equivalent to the 7-day cured optimum system of DBBD/MPEHA containing no additives, and increased the value of Wa for the M-A interface. The work of adhesion for the optimum system was found to increase with adhesive layer thickness, but obtained a maximum value at an optimum thickness. Cyclization was determined to be the best treatment of the neoprene surface to increase the Wa at the R-A interface. Testing of the optimum adhesive system at temperatures significantly lower than room temperature showed an increase in Wa at the R-A interface but no change at the M-A interface. However, testing at temperatures significantly higher than ambient yielded lower Wa values at both interfaces. The work of adhesion of the optimum adhesive system dropped significantly after 22 hours of water immersion. Further work should be carried out to increase the work life of the formulated adhesive and the hydrolytic stability of the total system.
Published Version
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