Tris(aminomethyl)phosphine oxide was synthesized using tetrakis(hydroxymethyl)phosphonium sulfate as raw material,and then reacted with 4,4'-biphenyldicarboxylic acid to obtain phosphorus-containing hyperbranched semi-aromatic polyamide.The structures of tris(aminomethyl)phosphine oxide and phosphorus-containing hyperbranched polyamide were characterized by FT-IR and(1 H,13C,31P)NMR,and the branching degree of the polymer was calculated to be 0.69.Thermogravimetric analysis(TG),dynamic mechanical thermal analysis(DMA),and microscale calorimeter(MCC)were used to analyze the properties of the polymers.The results showed that the phosphorus-containing hyperbranched semi-aromatic polyamides had high thermal stability and good flame retardancy.
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