Molecular weight calculation of a polymer from viscosity measurements


The viscosity of a liquid is determined by the intermolecular forces of attraction. In solution, the viscosity of the solvent can vary significantly in relation to the type and concentration of the solute present. Depending on the size, macromolecules have a significant impact on the viscosity of the solvent. The viscosity measurements can be used to estimate the average molecular mass of a macromolecule if you know the conformation of the macromolecule itself. Using a thermostatic capillary viscometer, the viscosity of polystyrene solutions in toluene are measured for five polymer concentrations and the molecular weight is calculated.

Training program

  • Viscosity of liquids
  • Ostwald capillary viscometer
  • Poiseuille equation
  • Macromolecules

Technical specifications
Supply with