STRUCTURE RHEOLOGY OF CARBOXYMETHYL CELLULOSE (CMC) SOLUTIONS

Rheological study on carboxymethyl cellulose (CMC) dissolved in (6% NaOH in Water) solution was undertaken; Seven grades of carboxymethyl cellulose had been used.The Mw data were obtained by M-H equation using intrinsic viscosity data, where are obtained based on viscosity measurement.( 19,918, 45,700,76,693, 83,139, 148,800) gm/cm The values of Huggins coefficient (K3) have been obtained from plotting (ηredHvs conc.). (1.135, 0.3,3.448, 0.473, 0.059)gm/mol.The flow curves have been measured for different molecular weights with different concentrations,which lead to estimation the viscosity (η₀) at shear rate zero.The concentrated region involved the determination of the network parameters (Me,A(C) ) by plotting ηoo versus Mwt in log-log scale it may lead to determine the critical molecular weight
(Mc) the transition point from particle to network region,.