Huggins equation

The Huggins Equation is an empirical equation used to relate the reduced viscosity of a dilute polymer solution to the concentration of the polymer in solution. The Huggins equation states:

[ n s p c ] = [ n ] + k H [ n ] 2 c

Where n s p c is the [specific viscosity of a solution of concentration] of a polymer in solution, [ n ] is the intrinsic viscosity of the solution, k H is the Huggins coefficient, and c is the concentration of the polymer in solution. In isolation, n s p is the specific viscosity of a solution of concentration.

The Huggins coefficient used in this equation is an indicator of the strength of a solvent. The coefficient typically ranges from about 0.3 (for strong solvents) to 0.5 (for poor solvents).