Abstract
A study was conducted to determine the effect of adding p-cresol formaldehyde (PCF) resin as an interfacial agent to a nitrile rubber (NBR)-phenol formaldehyde (PF) structural adhesive, on its joint strength, stress-strain properties, glass transition temperature (Tg), and morphology. The addition of PCF resin up to 20% showed a remarkable improvement in joint strength accompanied by an improvement in the mechanical properties. Scanning electron microscopy and DSC analysis (Tg) showed that the NBR/PF blend is a two-phase system and with the addition of PCF resin, the two phases tend to become continuous and the Tg of the NBR phase is increased. From the results obtained we propose that PCF acts as an interfacial agent and facilitates the bonding between the two phases, which improves the mechanical properties, and hence the joint strength. PCF contents above 20% produced a decrease in the joint strength, which is attributed to decreased toughness resulting from the high cross-linking of the NBR phase.
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