Dilute Solution Viscosity is used as an indication of the molecular weight of polymers. The results of the test are expressed in Relative Viscosity, Inherent Viscosity, or Intrinsic Viscosity. The polymer is first weighed and then dissolved in an appropriate solvent. The solution and viscometer are placed in a constant temperature water bath.
Thermal equilibrium is obtained within the solution.
The liquid is then brought above the upper graduation mark on the viscometer. The time for the solution to flow from the upper to lower graduation marks is recorded. Commonly, an average of 40-50 mg. of polymer and 10 ml of solvent. Relative Viscosity, Inherent Viscosity or Intrinsic Viscosity is calculated. Links Entire contents 1996-2001 Plastics Technology Laboratories, Inc.