1989 Volume 17 Issue 2 Pages 94-99
Some rheological properties were investigated for poly (vinyl alcohols) in dimethyl-sulfoxide solutions over a wide range of molecular weight and concentration. Basic properties of the storage modulus G′(ω) and the loss modulus G″(ω) were similar to the previous results of other polymer solutions. The frequency-temperature and and the frequency-concentration superposition methods were applied to the data and the concentration dependence of the characteristic relaxation time,τ, and the steady shear compliance, Je, were determined: τ∝C3, Je-1∝C0.6(C<Cc : Cc is critical concentration), and Je-1∝C3.4 (C>Cc) were obtained. The viscosity varied as η0∝C6.4 (C>Cc) and η0C3.6 (C<Cc). The critical molecular weight Me was evaluated from dependences of the zero-shear viscosity on moleculare weight and concentration. The results were in approximate agreement with that of PVA aqueous solutions in previous papers.