Preparation and performance of lubrication composite coating based on poly(4-oxybenzoyl) (I)

Abstract

Poly(4-oxybenzoyl) (POB) based composite films were sintered on test blocks, while POB was synthesised in situ by melt polycondensation. The XRD analysis corroborates a high degree of crystallinity of the obtained POB. However, the obtained POB exhibited a lower decomposition temperature T_d and a lower crystal transition temperature T_c than the commercial POB. Sand blasting of the substrates’ surfaces led to a substantial increase in the bonding strength between the prepared composite coatings and the substrates. Nevertheless, increasing the coating's thickness, increasing the MoS₂ mass content in a coating or elevating the sintering temperatures resulted in a decrease in bonding. The fracture modes of the coatings during the peel tests were depicted as a combination of the separation of the coatings from the substrates and the breaking of the coatings themselves when the coatings’ thicknesses ranged from 50 to 200 μm.