特性粘度是v固有的假设iscosity of a solute at infinite dilution. It can be written as:
Whereηrepresents the intrinsic viscosity of the solute, crepresents the concentration of the solute andηinhrepresents the inherent viscosity of the solution. Intrinsic viscosity can be used to determine the molecular weight of a polymer using the Mark-Houwink equation. To determine intrinsic viscosity, several solutions of the solute are prepared at different concentrations. The inherent viscosity of each solution is then measured and plotted as a function of concentration. The y-intercept of this plot is the intrinsic viscosity. The units of intrinsic viscosity are typically deciliters per gram (dL/g), or inverse concentration and can also be viewed as an indication of molecular density for a polymer under a given set of conditions (solvent composition and temperature).
- Quality control tool for polymers
- Determine viscosity average molecular weight of polymers
- Examines polymer architecture (branching)
