Chain conformation and intermolecular interaction of partially neutralized poly(acrylic acid) in dilute aqueous solutions
The isoionic dilution method was used to measure the intrinsic viscosity, [η], and the Huggins coefficient, K(H), of two poly(acrylic acid) samples, 50% neutralized with NaOH, with molecular weights 5.0 x 103 (Na50PA5) and 4.8 x 104 (Na50PA48) at different ionic strengths. For Na50PA5 at low ionic strength, [η] is higher than the value predicted by a rigid-rod model. Assuming that the chain has re
