Polycomplexes of the polycondensation products of boric acid and p-phenylenediamine

Abstract

An extreme dependence of the softening temperature of polycomplexes of p-phenylenediamine and low-molecular-weight polycondensation products of boric acid on the ratio thereof is revealed. The stoichiometric ratio of the BA/p-PDA complex is 75/25 wt %, which corresponds to a molar ratio of BA trimer/p-PDA = 1: 1. At a higher content of the amine, the softening temperature of the polycomplex decreases sharply, from 250 to 60°C, which is explained by the complexation of boric acid with the amine, a factor that prevents its dehydration. The energies of the intermolecular interaction between the components of the complex in a vacuum are calculated, and quantum-chemical calculations of the energy of interaction between the components of the complex are performed. The resulting products exhibit paramagnetic and fluorescent properties.