Direct Polycondensation of Castor Oil Based Dimer Acid and Aromatic Diamines Using Triphenylphosphite

Aliphatic–aromatic polyamides of castor oil based dimer acid (DA) with various aromatic diamines, viz., 4,4′‐diaminodiphenyl sulfone (SD), 4,4′‐diamino‐diphenyl methane (MD), and p‐phenylene diamine (PD) were synthesized using triphenylphosphite (TPP) as condensation reagent. Pyridine and N,N‐dimethyl formamide (DMF) were not used in this synthesis. The resulting polyamides were characterized by elemental analysis, infrared spectroscopy, and viscosity and swelling measurements. The solid conductance values for these polyamides were found to be in the range 10−10–10−13 S cm−1, upon heating the conductance values enhanced to 10−7–10−9 S cm−1. These polyamides exhibited heat resistant properties.