A series of dimer acid-based polyamides were synthesized by melt-polycondensation of dimer acid and various aromatic diamines,and were characterized by Fourier transform infrared spectrum(FT-IR)and nuclear magnetic resonance(1~H NMR).The physical properties of the polyamides,such as glass transition temperature,melting temperature,decomposition temperature and mechanical properties were also investigated.The polyamides'intrinsic viscosity ranges from 1.8 dL·g~(-1) to 2.2 dL·g~(-1),and the melting temperature ranges from 140℃to 181℃.The glass transition temperatures,observed from dynamic mechanical analysis,fall in the range of 34.8-48.2℃.The physical and mechanical properties of the resultant polyamides are similar to those of the PA1212.The heat resistance and mechanical properties of poly(4,4'-diphenylsulfone dimeramide)(PSD)and poly(4,4'-diphenyl dimeramide)(PPDI)are comparable to those of PA1212.
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