Polyoxymethylene (POM) has been widely utilized in industry due to its light weight properties in engineering plastics. At present, POM applications are expanding into the car industry, especially in fuel tanks. Hindered alkyl phenol derivatives have been used as antioxidants for POM; however, these compounds are easily extracted by solvents. Two antioxidants with new structures (N,N'-triethylenedioxy-bis(3-tert-butyl-4-hydroxy-5-methylhydrocinnamamide) and N,N',N'-tris[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyl-3-oxapentyl]melamine) were synthesized and characterized, and their performance as antioxidants for POM was investigated in the present study. The results revealed that N,N'-triethylenedioxy-bis(3-tert-butyl-4-hydroxy-5-methylhydrocinnamamide) has good heat aging resistance compared to existing antioxidants for POM, and N,N',N'-tris[(3-tert-butyl-4-hydroxy-5-methylphenyl)propionyl-3-oxa-pentyl]melamine has good extraction resistance against solvents. (C) 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012