The intrinsic viscosities

[η]

of three sodium cellulose sulfate samples

with known molecular weight and Degree of Substitution=1

were determined at 25℃ under different ionicstrengths

I

of NaCl. [η] vs. and logs vs. log [η]0.1 plots are linear. According to Smidsrod's Eq

values empirical parameter B are found to be 0.088. 0.090 and 0.088

respectively. The empirical parameter B

which is a measure of relative stiffness of different polymer chains

can also be used as a measure of the response of [η] to the addition of salt for different polyelectrolytes.