Viscosity of poly(vinyl acetate) and its concentrated solutions

Abstract

AbstractData on the viscosity of poly(vinyl acetate) (PVOAc) and its concentrated solutions in diethyl phthalate (DEP) and cetyl alcohol (CeOH) are examined over the molecular weight range 8 × 103 < M < 1.3 × 106, the range 0.15 < φ < 1.0 of the volume fraction φ of polymer, the temperature range 308 to 430°K for PVOAc and its solutions in DEP, and at 396°K in CeOH. The latter is the θ temperature for dilute solutions of PVOAc in CeOH. The data are analyzed with the relation η = KXc(αφM/Mc)a exp[1/β(T – T0)], where a is 1 or 3.4 for αφM less than or greater than a constant Mc, respectively, and XC, is a constant. The expansion factor αφ of the chain dimension is found to be essentially unity for φ > ca. 0.25, increasing with decreasing φ for smaller φ. Both β and T0 depend on φ, and T0 also depends on M at low M.