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Viscosity, Intrinsic
η
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• Limiting Viscosity Number
 
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Definition: A measure of the capability of a polymer in solution to enhance the viscosity of the solution. Intrinsic viscosity-increases the increasing polymer molecular weight. The viscosity behavior of macromolecular substances in solution is one of the most frequently used approaches for characterization. The intrinsic viscosity number is defined as the limiting value of the specific viscosity/concentration ratio at zero concentration. It thus becomes necessary to find the viscosity at different concentrations and then extrapolate to zero concentration. The variation of the viscosity number with concentration depends on the type of molecule as well as the solvent. In general, the intrinsic viscosity of linear macromolecular substances is related to the molecular weight or degree of polymerization. With linear macromolecules, viscosity number measurements can provide a method for the rapid determination of molecular weight when the relationship between viscosity and molecular weight has been established. Intrinsic viscosity is calculated by determining ηsp/C and extrapolating to infinite dilution.

where:

c = concentration of polymer in grams per 100 milliliters of solution

Also known as LIMITING VISCOSITY NUMBER.
Definition Copyright ©1989 CRC Press LLC. All rights reserved.

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