Intrinsic viscosity is a measure of the molecular weight and molecular size of a polymer in solution. It is often used to characterize the viscosity of polymers in solution and is used in the determination of the molecular weight of a polymer.
Intrinsic viscosity is defined as the natural logarithm of the ratio of the viscosity of a solution to the viscosity of the solvent, divided by the concentration of the polymer in the solution. Mathematically, it is expressed as:
[η] = ln(ηrel) / c
Where [η] is the intrinsic viscosity, ηrel is the relative viscosity (ηrel = ηsolution / ηsolvent), and c is the concentration of the polymer in the solution.
Intrinsic viscosity is typically measured using a viscometer and can be used to estimate the molecular weight of a polymer using the Mark-Houwink equation. This equation relates the intrinsic viscosity of a polymer to its molecular weight and provides a way to determine the molecular weight of a polymer based on its intrinsic viscosity.
Overall, intrinsic viscosity is an important parameter in polymer science and is used in various applications, such as in the characterization of polymers for industrial purposes, in the development of new materials, and in research studies on polymer properties.
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