The effect of the conditions of synthesis on the properties of polyamino amido acids

Abstract

INTENSIVE studies are now being carried out abroad and in the Soviet Union of the synthesis of polymers prepared from aromatic tetra-amines and tetracarboxylic acid dianhydrides [1-14]. The most interesting results were obtained by two-stage synthesis using solvents, which made it possible to obtain soluble linear polymers (polyaminoamidoacids) capable of cyclodehydration at high temperatures [2-6]. Problems related to ring formation of polyaminoamidoacids were examined in many papers and thermal and thermal oxidative breakdown processes studied [1-14]; however, there is no systematic information in the literature concerning the effect of the conditions of synthesis on the molecular weight of the polymers studied. We therefore determined the effect of certain factors on the molecular weight of polyaminoamidoacids from the dynamic viscosity of the polymer solutions obtained. We studied 3,3'4,4'-tetraaminodiphenylmethane (I) and pyromellitic dianhydride (II). The reaction system may be conventionally shown as: O O H2N NH2 ~