Study of Equivalent Retention among Different Polymer-Solvent Systems in Thermal Field-Flow Fractionation

Won Suk Kim, Young Hun Park, Myeong Hee Moon, Euy Kyung Yu, Dai Woon Lee

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

An equivalent retention has been experimentally observed in thermal field-flow fractionation (ThFFF) for different polymer-solvent systems. It is shown that iso-retention between two sets of polymer-solvent systems can be obtained by adjusting the temperature difference (ΔT) according to the difference in the ratio of ordinary diffusion coefficient to thermal diffusion coefficient. This method uses a compensation of field strength (ΔT) in ThFFF at a fixed condition of cold wall temperature. It is applied for the calculation of molecular weight of polymers based on a calibration run of different standards obtained at an adjusted ΔT. The polymer standards used in this study are polystyrene (PS), polymethylmethacrylate (PMMA), and polytetrahydrofuran (PTHF). Three carrier solvents, tetrahydrofuran (THF), methylethylketone (MEK) and ethylacetate (ETAc) were employed. Though the accuracy in the calculation of molecular weight is dependent on the difference in the slope of log λ vs. log M which is related to Mark-Houwink constant a, it shows reasonable agreement within about 6% of relative error in molecular weight calculation for the polymer-solvent systems having similar a value.

Original languageEnglish
Pages (from-to)868-874
Number of pages7
JournalBulletin of the Korean Chemical Society
Volume19
Issue number8
Publication statusPublished - 1998 Aug 20

    Fingerprint

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

Cite this