STYRENE-BUTADIENE BLOCK COPOLYMERS IN DILUTE-SOLUTION .1. ASSESSMENT OF EXTRAPOLATION METHODS FOR INTRINSIC-VISCOSITY AND VISCOSITY CONSTANT DETERMINATION

Both the intrinsic viscosities and the viscosity constants of twelve ABA poly(styrene-b-butadiene) copolymers and of polystyrene and polybutadiene were obtained by the Huggins, the Kraemer, the Martin and the Schulz-Blaschke methods in carbon tetrachloride, toluene, benzene, tetralin, cyclohexane and cyclohexanone as well as in the micellating solvents ethyl acetate and methyl ethyl ketone. The extrapolation procedures were compared. It was concluded that the averaging procedures suggested by Sakai were not necessary for this block copolymer. © 1979.