Research Institute of Bast Fibres (Czechia)

The method of calculation of the intrinsic viscosity [η] from one viscosity measurement according to the Solomon and Ciutǎ's equation has been analysed. The difference between [η] extrapolated from the measurement of viscosity at several concentrations and [η] calculated has been defined in dependence on the product [η]c and the value of Huggins' constant k'. It has been demonstrated that the proposed equation is often useful but not generally valid; the range of its applicability has been defined.