Synthesis of ploy(p-methoxyphenol) and evaluation of its antioxidation behavior as an antioxidant in several ester oils

Ploy( p -methoxyphenol), denoted as PMOP, was synthesized via an enzymatic polymerization method with p -methoxyphenol as the monomer . The corrosion resistance , tribological properties and thermal stability of as-synthesized PMOP were examined. The antioxidation behavior of as-synthesized PMOP as an antioxidant in ester oils was evaluated by rotary oxygen bomb test and pressurized differential scanning calorimetry . It was found that PMOP exhibits excellent antioxidation ability at 150   °C and 210   °C in various base oils. Besides, PMOP has much better antioxidation ability in synthetic ester oil like di-iso-octyl sebacate than several commonly used commercial hindered phenolic antioxidants.