Abstract: A novel triazine-containing diamine monomer 2，4-diamino-[N，N′-bis（4′-p-aminobenzylphenyl）]-6-phenyl-1，3，5-triazine was synthesized with 4，4′-diaminodiphenylmethane and 2，4-dichloro-6-phenyl-1，3，5-triazine as materials，with the anhydrous sodium carbonate as catalyst and dioxane as solvent. Orthogonal experiments were designed to optimize the reaction conditions for the synthetic experiment. The suitable experimental conditions were as follows，the reaction temperature was 160 ℃，the reaction reflux time was 4 h，the amount of 4，4′-diaminodiphenyl methane was 8 times as the amount of 2，4-dichloro-6-phenyl-1，3，5-triazine，the amount of anhydrous sodium carbonate was 3 times as the amount of 2，4-dichloro-6-phenyl-1，3，5-triazine material. When the experiments were performed under these suitable conditions，the yield could reach as high as 95. 56%. The melting point of the diamine monomer was determined to be 183. 59 ℃ with DSC（differential scanning calorimeter），characteristic vibration absorption peaks of functional groups of the diamine monomer were characterized by FT-IR spectrum，chemical shift and proton peak area and peak area ratio were characterized by 1H-NMR spectrum. The structure of the diamine monomer was determined.

Key words: 4, 4′- diaminodiphenylmethane, 2, 4- dichloro- 6- phenyl- 1, 3, 5- triazine, novel diamine monomer