Abstract
p-Xylylenediamine was synthesized with high yield through a hydrogenization of dinitrile of terephthalic acid. The effect of catalyst and solvent on the yield of the product was studied. The hydrogenization was carried out on skeletal catalysts based on alloy of Reney nickel Ni:Al (1:1) in aliphatic alcohols (C1-C4) at 4.0 MPa and 60 °C. New alkanearomatic polyimides were synthesized by one-step polycondensation of p-xylylenediamine and dianhydride of tricyclodecentetracarboxylic acid in the presence of isonicotinic acid as a catalyst in nonpolar amide solvents at 110-120 °C. The films based on the synthesized polyalkanimides are stable with 70-80 MPa breaking strength and 30-40% elongation. The glass transition temperature of the polymers is within 265-280 °C temperature range, the temperature of decomposition is above 340 °C. The tangent of dielectic loss of the films at 1 kHz and 25 °C is 0.002-0.004, the dielectric permitivity is about 3.22-3.35.