RIGID-ROD FULLY AROMATIC POLYAMIDES WITH CONTROLLED CONSTITUTION - SYNTHESIS AND SOME PROPERTIES

The theory of constitutional isomerism in polycondensates was applied to rigid-rod fully aromatic polyamides. Polymers from terephthalic acid chloride and 2,6-dichloro-p-phenylenediamine, nitro-p-phenylenediamine, and methoxy-p-phenylenediamine with varying constitutional order ranging from ordered head-to-head/tail-to-tail constitution to statistical constitution were obtained in a one-stage synthesis. Constitutional order was calculated by using the relevant kinetic reaction parameters and monomer feed rates and also determined in some cases by H-1 NMR spectroscopy. A significant dependence of the solubility of the polymers on the constitutional order was found.