Abstract
Solution polycondensation of aromatic mono- and di-sulfonic acid derivatives has been investigated using polyphosphoric acid, which served as a solvent as well as a condensing agent. Some monosulf onic acid derivatives such as sodium diphenylether-4-sulf ovate and barium dibenzyl-4-sulf ovate gave linear polysulf ones which showed inherent viscosities up to 0.17 and melting points below 250°C Disulfonic acid derivatives, however, failed to give water insoluble products.Some physical properties of the resulting polysulf ones are described.
