1995 Volume 23 Issue 1 Pages 27-31
Temperature (T), molecular weight (M), and concentration (C) dependence of zero shear viscosity (η0) was investigated for solutions of poly (acrylonitrile/vinyl acetate=97/3 wt.%) copolymers with various M ranging from 5×104 to 110×104 dissolved in aqueous NaCNS. The results were as follows;
1) In η0 exhibited linear dependence on 1/T. The activation energy of flow was E_??_6 Kcal/mol and was independent on M and C for the solutions studied.
2) Plots of log η0 vs. log C and log η0 vs. log M were represented by two straight lines with different slopes. The C dependence of η0 was described by power-law relationships η0 ∝C5.5(C>Cc) and η0∝C3.5(C<Cc) and the M dependence, by η0∝M3.4 (M>Mc) and η0∝M2.3 (M<Mc). Here Cc and Mc are critical concentration and critical molecular weight for chain entanglement.
3) The M dependence of Cc and C dependence of Mc were commonly described by a power-law relationship, M·Cc1.5=Mc·C1.5=K (constant).