Abstract
Adhesives for protecting offshore structures from corrosion must not be degraded due to water absorption. They also should be soft enough to reduce the shock and less sensitive to interfacial crack propagation between steel and the adhesive. In this research, three polyurethane adhesives were examined by dynamic mechanical tests and they also examined by IR spectroscopy before and after the water immersion. Water diffusion through the interface/interphase was also measured. The IR spectroscopy results proved no chemical reaction occurring due to immersion into water. The experimental results also confirmed that the glass transition temperatures of polyurethane adhesives synthesized from polyors made from castor oil had a strong correlation with the coefficients of water diffusion as well as the saturation ratio. The glass transition temperature could be an important indicator to estimate the water penetration into the interface/interphase between titanium adherend and polyurethane adhesives.
