Conformation des polyacrylamides partiellement hydrolyses en solution aqueuse

Abstract

Abstract A series of hydrolyzed commercial polyacrylamide samples were fractionated by successive precipitation fractionation. The radius of gyration R G and the intrinsic viscosity [η] of the fractions were measured as a function of the molecular weight and the NaCl concentration c s . The fractions were found to present the classical behaviour of polyelectrolytes with a conformation of expanded coils at c s = 0,1 mol/l. By increasing the salt concentration, the dimensions of the coils were found to become those of the unhydrolyzed, less expanded, polyacrylamide molecules.