Abstract
The intrinsic viscosity, [η], and the Huggins constant, κ′, of a poly(acrylic acid) (PAA) sample have been measured at different degrees of neutralization, i, ranging from i=0.25 to i=1.00 and different ionic strengths, I, in the region 1.0 × 10 −4 M< I<1.0 × 10 −1 M, using the isoionic dilution method in aqueous solutions. The results show that the variations of [η] and κ′ as a function of I are given by scaling laws characterized by constant exponents irrespective of the i value of the PAA sample investigated. An empirical equation giving the reduced viscosity of the PAA sample as a function of its concentration for various values of i and I has been obtained.
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