Approximate functions relating specific viscosity of PEO in DMSO vs. concentration respecting intrinsic viscosity for low concentrations

Abstract

The plots relating specific viscosity of a solution of poly(ethylene oxide) (PEO) in dimethyl sulfoxide (DMSO) with the corresponding PEO concentration can be seemingly approximated by various functions depending whether the normal, semi-log or log-log coordinates are used. However, these approximations should comply with the physical background of their courses, namely with the values of intrinsic viscosities if concentration of PEO in DMSO is tending to zero. To this aim a procedure of evaluating intrinsic viscosity is proposed and the corresponding approximate functions are selected.