On the intrinsic viscosity and the non-newtonian behaviour of dilute solutions of carboxymethylcelluloses in pure water

Study of the dependence on concentration of the reduced viscosity of carboxymethylcelluloses (CMC), in the absence of added salts and down to relative viscosity 1·-01, leads to two typical parameters of the polyion. The molecular dimensions of H-CMC and Na-CMC have been determined from these two parameters using a rod-like model. The gradient dependence of viscosity has been studied; the two samples of CMC in water (M = 41,000 and 180,000) show the non-Newtonian behaviour of solutions of rigid particles.