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Field-Flow Fractionation

  • Harald Pasch
  • Muhammad Imran Malik
Chapter
Part of the Springer Laboratory book series (SPLABORATORY)

Abstract

Size exclusion chromatography separates polyolefins according to hydrodynamic size in solution and it is assumed that one hydrodynamic size corresponds strictly to one molar mass. This, however, is not always the case as has been shown, e.g. for high molar mass branched polymers. For such materials, co-elution of linear and branched molecules having different molar masses has been observed. On the other hand, samples with very high molar masses cause problems in SEC because the largest molecules are frequently shear degraded by the pores and frits of the columns, resulting in molar masses that are lower compared to those of the injected sample. Most of the above problems can be avoided when channel-based fractionation methods are used. This chapter presents some latest results on polyolefin analysis by field-flow fractionation. The fundamentals of the technique are discussed and a number of experimental approaches are given.

Keywords

Molar Mass Size Exclusion Chromatography High Molar Mass Average Molar Mass Molar Mass Distribution 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Harald Pasch
    • 1
  • Muhammad Imran Malik
    • 2
  1. 1.Department of Chemistry and Polymer ScienceUniversity of StellenboschMatielandSouth Africa
  2. 2.International Center for Chemical and Biological Sciences (ICCBS) H.E.J. Research Institute of ChemistryUniversity of KarachiKarachiPakistan

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