Synthesis and Tribological Behaviors of Epoxy/Phosphazene‐Microspheres Coatings under Dry Sliding Condition

Abstract

Using precipitation, polymerization one step to synthesize poly[cyclotriphosphazene‐co‐(4,4′‐sulfonyldiphenol)] microspheres (PZs) with hexachlorocyclotriphosphazene and 4,4′‐sulfonyldiphenol, and filled epoxy matrix to prepare composite coatings to study the thermal and friction modified mechanisms. PZs have average particle diameter of 500 nm, the initial decomposition temperature is 457.5 °C and the solid residual rate at 600 °C is 63.1%. PZs uniformly dispersed in the epoxy matrix and effectively improve the Tg and thermostability of the composite coatings. The frictional coefficient of the epoxy/PZs composite coatings reduced from 0.61 ± 0.02 of pure EP to a minimum 0.38 ± 0.01 and the volumetric wear rate reached a minimum 13.2 × 10−11 mm3 with 3 wt% PZs filling. The SEM morphology of grinding crack showed that PZs microspheres have an obvious wearing resistant effect.