Small-Angle X-Ray Scattering as a Useful Supplementary Technique to Determine Molecular Masses of Polyelectrolytes in Solution

Beatrice Plazzotta, Jakob Stensgaard Diget, Kaizheng Zhu, Bo Nyström, Jan Skov Pedersen

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Abstract

Determination of molecular masses of charged polymers is often nontrivial and most methods have their drawbacks. For polyelectrolytes, a new possibility for the determination of number-average molecular masses is represented by small-angle X-ray scattering (SAXS) which allows fast determinations with a 10% accuracy. This is done by relating the mass to the position of a characteristic peak feature which arises in SAXS due to the local ordering caused by charge-repulsions between polyelectrolytes. Advantages of the technique are the simplicity of data analysis, the independency from polymer architecture, and the low sample and time consumption. The method was tested on polyelectrolytes of various structures and chemical compositions, and the results were compared with those obtained from more conventional techniques, such as asymmetric flow field-flow fractionation, gel permeation chromatography, and classical SAXS data analysis, showing that the accuracy of the suggested method is similar to that of the other techniques.

Original languageEnglish
JournalJournal of Polymer Science. Part B, Polymer Physics
Volume54
Issue19
Pages (from-to)1913-1917
Number of pages5
ISSN0887-6266
DOIs
Publication statusPublished - 2016

Keywords

  • SAXS
  • calculations
  • electrostatic interactions
  • molecular masses
  • polyelectrolytes

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