Polymerization and decomposition of terephthaloyl chloride and p-phenylenediamine at 500 °C

Re‐attainable lubrication films at 500°C converted through the positional polymerisation of DCDPS on the preset Na2S coating

“…However, unlike the vapourdeposited lubrication, polymers cannot be gasified and introduced into friction system. Our group found that polymer products could be generated above 400 C through the gas-phase polymerisation of two monomers, 17 and developed a gas-phase polymerising lubrication method 18 : During the friction process, two gasified monomers, phthalic anhydride and p-phenylenediamine, were introduced into friction system at 500 C. They would be gasified, contacted and polymerised into polymer products with the structure of imides, thus forming lubricating films in real-time. In a 10 min friction test at 500 C with 50 N loading and 0.785 m/s sliding speed, the coefficient of friction (COF) and wear could be reduced by 56% and 97% through the gas-phase polymerising lubrication, and this frictionreducing effect could be re-attained by re-introducing monomers.…”