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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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"Viscotek is the leader in Triple Detection Chromatography. Viscotek instrumentation and accompanying software achieve goals and success that were not thought possible in the past."
- L.M., Major Industrial Corporation
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Product Portfolio
Browse our product portfolio to discover which Viscotek products can help with your macromolecular characterization.
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"I have purchased 7 GPC systems from Viscotek in Europe, US and Canada. I am very satisfied. The systems are robust and affordable. OmniSEC software is very user friendly and highly versatile."
- R.N., Academic Institution |
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GPC Theory: Flow Injection Polymer Analysis (FIPA) |
 Flow Injection Polymer Analysis (FIPA) is a fast, accurate, precise and reliable
technique for the determination of average molecular weight, molecular size, intrinsic
viscosity and percent polymer. Like Gel permeation Chromatography (GPC), FIPA uses
a column to separate materials on the basis of size. Unlike GPC, FIPA does not provide
a distribution of information. Instead, the column technology in the FIPA experiment
is used to separate the polymer of interest form any low molecular weight constituents
such as diluents, additives, monomers and oligomers that may be in the sample.
FIPA is an advanced detector game that employs triple detector characterization
technology. Light scattering detectors provide absolute molecular weight, viscometer
detectors provide intrinsic viscosity and size, while concentration detectors provide
concentration and information on percent polymer. A single polymer standard is used
to calibrate all three detectors simultaneously
and the procedure for sample analysis
after calibration is as follows:
- The sample is diluted with an approximate amount of mobile phase solvent and then
injected into a triple detector system.
- The polymer is separated from the low molecular constituents (diluent, additives,
monomer, oligomers) by the FIPA column.
- FIPA software calculates quantities of interest from the three integrated polymer
signals; polymer concentration from the refractometer, Molecular Weight from the
light scattering, and Intrinsic Viscosity from the viscometer.
The precision on all three quantities is typically 0.3% RSD, and FIPA run times
are from 3- 5 minutes. Because of the simplicity, speed, precision and accuracy
of the analysis, FIPA is uniquely suited to process control at-line and on-line
industrial applications where control of polymerization processes requires fast
turnaround time for sequential measurements of the extent of reaction. It is also
uniquely suited for high throughput scenarios where the sample volume (Number of
samples) is simply too great for the lengthy separation process involved in GPC.
Some common FIPA applications would include but not to be limited to Polycarbonate
in CH2Cl2 or THF, Polyvinyl Acetate in THF, Polymethyl Methacrylate in THF, Linear
and Branched Polystyrene in THF, Block Copolymer (SIS and SBS) in THF, Low Crystallinity
EPDM in THF, Polyimide in THF, Phenolic Resins in THF, Polyurethane in THF, High
Crystallinity EPDM in 60°C THF or Cyclohexane, Polyvinyl Alcohol in 0.1M NaNO33,
Polyacrylamide in 0.1 M NaNO3, Xylene Solubles of polypropylene and Nylon in Formic
Acid.
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