Polymers | Reduced Viscosity as Quality Control Parameter for Polyamides
Polyamides are important polymers used for e.g. fiber production. Dilute solution viscometry determines the viscosity number, which describes the quality of the polyamide. Lovis microviscometer enables simple measurements and automatic calculation of polymer parameters at the touch of a button.
Polyamides are polymers containing repeating amide linkages –CO–NH– and are important engineering polymers. Main known uses are fiber applications such as the production of Nylon stockings and other garments, carpets and industrial filaments. Since the viscosity of a polymer solution depends on the polymer’s molecular weight, dilute solution viscometry is often performed for the quality control of polymers. With this technique, the batch-to-batch variability is monitored, and degradation caused by processing can be evaluated.
Reduced viscosity is an important parameter describing the quality of polyamides. It is also often referred to as the viscosity number (VN) or Staudinger function and is the parameter of interest when performing measurements according to ISO 307.
Due to its special polymer software features, the Lovis microviscometer is well-suited for the determination of multiple polymer parameters. When performing dilute solution viscometry with Lovis, the runtimes of the ball in both the pure solvent and the polymer solutions are measured. By automatically comparing these runtimes, Lovis calculates the relative viscosity. From the relative viscosity and the polymer solution concentration, parameters such as intrinsic viscosity (IV), reduced viscosity, or inherent viscosity are automatically determined.
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