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Viscometry


Capillary viscometry is considered as the most accurate method for the determination of the viscosity of Newtonian liquids. By this technique the time is measured a certain volume needs to flow through a capillary of defined dimensions. The meniscus is detected by means of light barriers, enabling the precise determination of the flow time.

In the field of polymer chemistry capillary viscometry is used to determine the viscosity number, the K-value and the intrinsic viscosity. By means of these data the molecular mass can be determined, which is one of the most important values to characterize polymers.

Measure:

  • Intrinsic Viscosity (also known as Staudinger-Index)

  • Relative Viscosity, Specific Viscosity

  • Viscosity number

  • Inherent Viscosity

  • K-value (Fikentscher)

  • Relative Viscosity, Viscosity ratio

  • Viscosity index

  • Kinematic Viscosity

  • Degree of particle swelling

  • Dynamic Viscosity


Methods:

DIN EN ISO 1157

Determination of the viscosity number and the viscosity ratio of cellulose acetate in dilute solutions.

DIN EN ISO 1628/1-6

Determination of the viscosity of polymers in dilute solution using capillary viscometers:
Part 1: General principles
Part 2: Poly(vinyl chloride) resins
Part 3: Polyethylene and Polypropylene

Part 4: Polycarbonate (PC) moulding and extrusion materials
Part 5: Thermoplastic polyesters (TP) homopolymers and copolymers
Part 6: Methyl methacrylate polymers

ISO 307

Plastics - Polyamides - Determination of viscosity number

SNV 195 598

Determination of viscosity number of cellulose in EWN


The measurements can be adjusted to the requirements of the customers, e.g. choice of the solvent or temperature. We possess a large databank of Kuhn-Mark-Houwink parameters, enabling in many cases the transformation of the intrinsic viscosity into molecular weights.

Capillary viscometer
 
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