Viscometer Detector Overview

Polymer Char’s viscometer detectors are designed to provide on-line viscosity data of polymers in solution.

Integrated in Polymer Char’s GPC-IR, CEF, and CRYSTEX QC / CRYSTEX 42 instruments, the viscometer provides valuable information that enhances the primary data obtained by each separation technique.

In instruments like IVA and IVA Versa, the viscometer becomes the central part of the instrument providing its main functionality: analyzing the intrinsic viscosity of polymers.

Polymer Char’s viscometer design is based on the patented technology of differential pressure capillary viscometers (Wallace W. Yau US4793174A). This technology operates by measuring the pressure drop across a capillary tube when a fluid flows through it. This pressure drop is caused by the resistance offered by the fluid to flow through the capillary, which is directly related to the fluid’s viscosity. By accurately determining the pressure drop and considering other parameters like the capillary dimensions and flow rate, the viscosity of the fluid can be calculated.



Calculating intrinsic viscosity using a differential pressure capillary viscometer involves determining the viscosity of the polymer in solution and the viscosity of the solvent. From these values, the intrinsic viscosity of the polymer can be obtained by applying different equations. Read more about Intrinsic Viscosity Determination



Viscometer Features

• High sensitivity
• Configurations with dual capillary or 4-capillary bridge are available according to each technique
• Purge valves included
• Robust design even for most challenging polymers

Frequently Asked Questions about the Viscometer Detector

No, the viscometer is designed as a compact detector to be integrated into Polymer Char’s instruments. If you are looking for a standalone viscosity meter, please check our Intrinsic Viscosity Analyzers.

Yes, the viscometer needs to be calibrated with reference samples of known viscosity.

· In GPC technique, the advantage of having an online viscometer is that it allows for the application of the Universal Calibration principle, and the analysis of Long-chain Branching (LCB).

· In CEF/TGIC, a viscometer detector will provide the bulk Intrinsic Viscosity (IV), which is related to the molar mass of the polymer, therefore, information on molar mass and chemical composition interdependence can be obtained by adding a viscometer detector.

· In CRYSTEX, a viscometer detector will provide intrinsic viscosity results for the whole sample, the soluble fraction, and the crystalline fraction.

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