As shown in Figure 3, solution intrinsic viscosity decreases as temperature increases.
What is K in Mark Houwink equation?
is intrinsic viscosity. K is a constant. With known values for and K it is easy to take the values from an intrinsic viscosity experiment and calculate .
How do you calculate intrinsic viscosity from relative viscosity?
The intrinsic viscosity number is defined as the limiting value of the specific viscosity/concentration ratio at zero concentration. Intrinsic viscosity is determined by measuring the relative viscosity at several different concentrations and then extrapolating the specific viscosity to zero concentration.
What is the value of K and alpha for polystyrene is?
Mark-Houwink Constants 1
| Polymer / Solvent | T (°C) | K x 103 (ml/g) |
|---|---|---|
| Polystyrene (atactic) / Trichlorobenzene | 135 | 14.7 |
| Polystyrene (atactic) / Toluene | 25 | 8.6 |
| Polystyrene (isotactic) / Benzene | 30 | 10.1 |
| Polystyrene (isotactic) / Tetrahydrofuran | 25 | 16.0 |
How do you calculate decreased viscosity?
Introduction. In the case of neutral polymer solutions, the reduced viscosity ηSP/C is proportional to the concentration C in the dilute solution. This well-known relation is used for determining the intrinsic viscosity [η] simply by extrapolating to C=0.
What is the formula for relative viscosity?
Dividing the viscosity of the polymer solution (η) by the viscosity of the pure solvent (ηο) gives the relative viscosity with the dimensionless unit. Equation 7: Relative viscosity is the viscosity of the polymer solution divided by the viscosity of pure solvent.
What is meant by intrinsic viscosity?
Intrinsic viscosity is a measure of a solute’s contribution to the viscosity. of a solution. It should not be confused with inherent viscosity, which is the ratio of the natural logarithm of the relative viscosity to the mass concentration of the polymer.
