BAGLEY PLOT OF THE VECTRA B950 THERMOTROPIC POLYMER

The nonlinearity of the Bagley plot of a thermotropic copolyesteramide is interpreted on the basis of the Eyring theory. The results obtaine d show that this nonlinearity can be interpreted as mainly due to an i ncrease of viscosity with pressure. The dependence of viscosity on pre ssure is shown to vary upon the type of texture present in the capilla ry, either the worm-like one developed at low shear rates or the order ed one developed at high shear rates.