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Static light scattering (SLS) is a technique to measure absolute molecular weight using the relationship between the intensity of light scattered by a molecule and its molecular weight and size, as described by the Rayleigh theory. In the simplest terms, Rayleigh theory says that larger molecules scatter more light than smaller molecules from a given light source and that the intensity of the scattered light is proportional to the molecule’s molecular weight.
There are two ways to measure absolute molecular weight by SLS:
Batch measurement with cuvette based instruments, such as the Zetasizer series, is an ensemble technique. Therefore the result calculated is the weight average molecular weight of the entire sample measured.
However, the most common way of measuring absolute molecular weight is to add an SLS detector e.g. Low Angle Light Scattering LALS, Right Angle Light Scattering RALS or Multi Angle Light Scattering MALS to a GPC/SEC system. By combining SLS with the separation technique you can calculate the absolute molecular weight at any point in the eluting chromatogram and determining the molecular weight of any population in a mixed sample becomes possible.
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In this application note, a selection of different PLA and PLGA polymer samples were analyzed on Malvern's OMNISEC GPC/SEC system, which combines multiple detectors to provide information about structure and solution properties.
In this application note, the molecular weight, molecular weight distribution and size of common polymers are measured using the OMNISEC system.
In this application note, the structural distribution of some common polymers are compared using the Mark-Houwink plot. The data are all generated using the advanced OMNISEC multi-detector GPC/SEC system
This technical note describes how OMNISEC REVEAL, as part of a complete GPC/SEC system, can become a powerful tool for complete molecular characterization of synthetic polymers, natural polymers and polysaccharides, and proteins
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