Posted in | Chromatography

Solving SEC/GPC Limitations with Multi-Angle Light Scattering and Asymmetric-Flow Field-Flow Fractionation

Size-exclusion chromatography (SEC), also known as gel-permeation chromatography (GPC), has become the dominant technique for the determination of molar mass distributions of synthetic and natural polymers. The method is relatively simple and easy to use. However, limitations of this technique may lead to results that are not only incorrect, but even completely misleading.

The principal limitations of SEC are: 1) lack of appropriate column calibration standards; 2) non-ideal separation due to column interactions beyond purely steric; and 3) shear degradation of HMW fractions. These limitations can revealed—and often solved—by incorporating a multi-angle light scattering (MALS) detector following the SEC separation. Shear degradation and most of the non-steric effects can be eliminated by applying an alternative separation technique, asymmetric-flow field-flow fractionation (AF4).

Watch a short clip from the webinar below:

Difference between MALS & Dynamic Light Scattering

Key learning objectives:

  • Separation principles of SEC and AF4
  • Non-steric separation mechanisms
  • Why SEC with column calibration often provides incorrect molar mass distributions
  • Theory and instrumentation of multi-angle light scattering

About the webinar speaker: 

Prof. Stepan Podzimek works as a scientific consultant for Wyatt Technology. In addition to his position at Wyatt Technology, he is also working as a head of the Department of Analytical and Physical Chemistry at a Czech R&D company SYNPO, and holds a professorial position at the Institute of Chemistry and Technology of Macromolecular Materials in the Faculty of Chemical Technology of the University of Pardubice in the Czech Republic. He has been working in the field of polymer analysis and characterization for over 40 years. 

His research interests include methodology of the characterization of the molecular and chemical structure of synthetic and natural polymers by size exclusion chromatography, asymmetric flow field flow fractionation, liquid chromatography, and viscometry of dilute polymer solutions. In particular, he has focused on the characterization of branched polymers and structure-property relationships. 

He is an author or co-author of over 60 scientific papers and the author of a book entitled “Light Scattering, Size Exclusion Chromatography and Asymmetric Flow Field Flow Fractionation” published by Wiley.

Who should attend this webinar:

The webinar is intended for all scientists interested in detailed characterization of synthetic and natural polymers, especially SEC users and those who are interested in learning about an alternative separation technique offering advantages over SEC.

Download the Q&A report from the webinar here

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