Аннотация
Abstract The data obtained by systematic investigation of structure and molecular characteristics of commercial poly(phenylene sulfone) sample and the results of rheological measurements of properties of its melt at high temperatures and solutions in N-methylpyrrolidone within a wide range of compositions at room temperature are given. The polymer is typical amorphous substance according to its physical nature. The viscosity of solutions does not depend on the shear rate within the range of concentrations lower than 60%. The concentration dependence of viscosity within the whole range of compositions is described by the power law typical of concentrated solutions. The solutions also exhibit viscoelastic properties (the Maxwell model); the bimodal point is observed at polymer concentration of about 20%. The data obtained with rotational and capillary rheometers are in good accordance.