Английская Википедия:Huggins equation

Содержание

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

Текст

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. It is named after Maurice L. Huggins. The Huggins equation states:

<math>\frac{\eta_s}{c}= [\eta] + k_H [\eta]^2 c </math>

Where <math>{\eta_s}</math> is the specific viscosity of a solution at a given concentration of a polymer in solution, <math>[\eta]</math> is the intrinsic viscosity of the solution, <math>k_H</math> is the Huggins coefficient, and <math>c</math> is the concentration of the polymer in solution. In isolation, <math>n_s</math> is the specific viscosity of a solution at a given concentration.

The Huggins equation is valid when <math>[\eta]c</math> is much smaller than 1, indicating that it is a dilute solution. The Huggins coefficient used in this equation is an indicator of the strength of a solvent. The coefficient typically ranges from about <math>0.3</math> (for strong solvents) to <math>0.5</math> (for poor solvents).

The Huggins equation is a useful tool because it can be used to determine the intrinsic viscosity, <math>[\eta]</math>, from experimental data by plotting <math>\frac{\eta_s}{c}</math>versus the concentration of the solution, <math>c</math>.

See also

• Viscosity
• Rheology

References

Шаблон:Polymer-stub