Solution properties of polyantline and its derivatives

Summary form only given. The solutions of polyanitine(PAn), poly-o-toluidine(POT) and poly-o-anisidine(PAs) in N-methyl pyrrolidinone(NMP) and concentrated sulfuric acid are examined by viscometric and rheological measurements and GPC. The solution properties show tremendous concentration dependence. In the concentration below 0.25wt%, Mark-Houwink equation is obeyed for PAn with k = 1. 4 X 10/sup -4/ and /spl alpha/== 0. 93. Above 0.25wt% obvious interchain aggregation is observed for PAn solution in NMP, characteristic of the decrease of specific viscosity with concentration increase, the PAn solution in NMP behaves as Newtonian fluid when the concentration is below 5wt%. Over this concentration, it exhibits more and more pseudo-plasticity and the viscosity increases repidly with concentration, indicating that the gelation has taken place.