RHEOLOGICAL BEHAVIOR OF ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE

This paper presents the results of capillary and rotational viscosimetry of ultrahigh molecular weight polyethylene of brand GUR 2122. It has been established experimentally that in rotational viscosimetry, in the gas there are no uniform rates of shear, which does not permit using traditional methods of processing obtained fl ow curves. In capillary viscosimetry, rod-like fl ow is observed. Shear occurs only in the organic near-wall region, and the velocity profi le is far from parabolic and lies within traditional methods of viscosity determination. It has been established experimentally that besides the deformation rate infl uencing the fl ow stability of viscoelastic materials, ultrahigh molecular weight polyethylene also has limiting breaking deformations. The experimental nonmonotone-fl ow curve is described from the viewpoint of the modifi ed Vinogradov–Pokrovskii model.
   
Author:  E. V. Slavnov, O. I. Skul′skii, N. V. Shakirov, A. I. Sudakov, Yu. L. Kuznetsova, and O. V. Kryazhevskikh
Keywords:  ultrahigh molecular weight polyethylene, viscosimetry, rheology, methods of processing fl ow curves
Page:  1322