Synthesis and characterization of the. hyperbranched polyamide with triphenyl phosphorus structure and the influence on mechanical property of nylon-6

Due to the unique molecular structure, hyperbranched polymers showed many characteristics,such as high solubility, low viscosity and high-activity. Therefore, it had been widely applied in different areas. In this paper, isophthaloyl chloride(IPC) was used as A(2) monomer and tri (3-aminophenyl) phosphine oxide(TAPPO) was used as B-3 monomer, compounding hyperbranched polyamide with triphenyl phosphorus structure. The best reaction conditions were obtained that the molar ratio of TAPPO and 1PC was 1.5:1, the reaction temperture was 50 degrees C, the reaction concentration was 0.1 mol/L and the reaction time was 2h.Besides, the structure of the polymer was characterized by FT-IR and H1-NMR analysis.The H-1-NMR result showed that the branched degree of hyperbranched polyamide was 0.36.The DSC result showed that the glass transition temperature (Tg) was 130.7 degrees C. When the addition of P-HBPA content was 0.5% in PA6/P-HBPA blends, the properties of tensile strength, elongation at break and impact strength reached the maximum.