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Gel Permeation Chromatography (GPC), also known as Size Exclusion Chromatography
(SEC), is an analytical technique that determines the molecular weight
distribution (MWD) of a polymer by virtue of its hydrodynamic volume relative to that of polymer standards. A variety of detectors such as viscometers and refractive index detectors can be used to detect the polymeric material eluting from a GPC column. Molecular
weight averages such as Mn, Mw, and polydispersivity are also characterized
by GPC. The size and shape of polymeric molecules determine physical and
processing properties and are critical to producing a product with the
desired performance characteristics. This technique applies to any solvent
soluble polymeric material.
GPC-MALS uses a multi-angle light scattering (MALS) detector following a GPC column to provide absolute molecular weight and radius of gyration for sample molecules as they elute. Our full capabilities include a three-detector post column setup with the Wyatt HELEOSII, Viscostar and rEX proving light scattering intrinsic viscosity and extended range refractive index data. In some cases, information about molecular branching or solution conformation can also be interpreted for the sample.
- Characterize MWDs of polymers (polyesters, polurethanes, polyols, etc.)
- Determine
polymeric properties of incoming materials for processing suitability.
- Monitor
effect of processing conditions on MWDs.
- Troubleshoot product failure.
- Collect polymer fractions for subsequent analysis.
- Absolute Molecular Weight
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