A theory-based approach to thermal field-flow fractionation of polyacrylates

J. Ray Runyon, S. Kim Ratanathanawongs Williams

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A theory-based approach is presented for the development of thermal field-flow fractionation (ThFFF) of polyacrylates. The use of ThFFF for polymer analysis has been limited by an incomplete understanding of the thermal diffusion which plays an important role in retention and separation. Hence, a tedious trial-and-error approach to method development has been the normal practice when analyzing new materials. In this work, thermal diffusion theories based on temperature dependent osmotic pressure gradient and polymer-solvent interaction parameters were used to estimate thermal diffusion coefficients (D T) and retention times (t r) for different polymer-solvent pairs. These calculations identified methyl ethyl ketone as a solvent that would cause significant retention of poly(n-butyl acrylate) (PBA) and poly(methyl acrylate) (PMA). Experiments confirmed retention of these two polymers that have not been previously analyzed by ThFFF. Theoretical and experimental D Ts and t rs for PBA, PMA, and polystyrene in different solvents agreed to within 20% and demonstrate the feasibility of this theory-based approach.

Original languageEnglish (US)
Pages (from-to)7016-7022
Number of pages7
JournalJournal of Chromatography A
Volume1218
Issue number39
DOIs
StatePublished - Sep 28 2011
Externally publishedYes

Keywords

  • Polyacrylates
  • Polymer separations
  • Soret coefficient
  • Thermal diffusion
  • Thermal field-flow fractionation

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Organic Chemistry

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