Abstract
The friction mechanisms for sliding between dicarboxylic-acid-cured epoxide resins and stainless steel were investigated by monitoring the changes in the coefficient of friction and the geometry of the sliding surfaces in the glassy, transition and rubbery regions of the cured resins. In the glassy region, a constant value of the friction coefficient was obtained in spite of the variation in contact pressure. A trace of shearing fracture was observed on the sliding surfaces, and a linear relationship existed between the friction coefficient and the shear modulus of the cured resins. In the transition region, the maximum values of the friction coefficient were observed at the glass transition temperatures of the cured resins. The maximum value increased as the magnitude of the damping of these resins increased. In this region it was found that the softened polymer adhered to the metal surface and was also deformed by the movement of the metal specimen. In the rubbery region, the friction coefficient remained constant in spite of the variation in contact pressure. It was shown that a good correlation exists between the friction coefficient and the concentration of network chains.
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