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"The GPCmax and Triple Detector System is state-of-the-art while remaining affordable and easy to use."
- M. G., Ph.D., Academic Institution
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"The service provided by Viscotek representatives is unmatched by any other in the industry... A wonderful addition to the polymer community."
- E.F, Ph.D., Academic Institution
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HTGPC
The Viscotek High Temperature GPC (HT-GPC) System is a revolutionary advanced detector system specifically designed for the characterization of polyolefins, natural and synthetic polymers, nanoparticles and other large molecules.
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Application Notes
Our database of GPC/SEC application notes explain the use of concentration, viscometer and light scattering detectors to obtain a distribution of absolute molecular weight, size and intrinsic viscosity, as well as information on conformation, aggregation, branching and copolymer composition. |
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Dilute Solution Viscosity Theory - Overview |
Dilute Solution Viscosity (DSV) is the viscosity measurement of dilute solutions of polymers. Typically, a sample is dissolved in a solvent at a specified concentration in the range 0.2 – 1.0 g/dl.
The viscosity of the polymer solution is measured relative to the viscosity of the
pure solvent.
Where η is the viscosity of the solution and η0 is the viscosity
of the pure solvent.
Traditional Glass Tubes Method of Measurement
With a traditional glass capillary tube viscometer, we measure the time
it takes for the test liquid to flow through a capillary of a known diameter of
a certain factor between 2 marked points.
By multiplying the time taken by the factor of the viscometer, the viscosity is
obtained.
Determining Viscosity in this manner is both time-consuming and error-prone.
Glass capillary viscometers can not operate at very low concentrations and must
therefore use several concentrations for a Huggins plot (see fig 2) to derive intrinsic
viscosity by extrapolation to zero concentration.
The Relative Viscometer developed by Viscotek is able to operate at low concentrations
and will give intrinsic viscosity from one sample run by use of the Solomon-Gatesman
equation.
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