Conformational characteristics of poly(ethylene oxide) (PEO) in methanol

Jun Hyun Sung, Dong Choo Lee, Hyun Jin Park

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The conformational characteristics of poly(ethylene oxide) (PEO) in methanol at 25 °C were investigated by static light scattering and viscometry for high molar mass (Mw) PEO fractions covering Mw = 3.42 × 105-5.05 × 106 g mol-1. No trace of downturn in the plot of angular dependence of Kc/Rθ at low angle was found. Experimental scaling laws for the second virial coefficient (A2), the third virial coefficient (A3), the radius of gyration (〈 RG 21 / 2) and the intrinsic viscosity ([η]) were determined. The exponents characterizing these scaling laws confirmed that the PEO chain in methanol has a flexible conformation with relatively large excluded volume, but methanol is not as good solvent as water. On the other hand, the low value of interpenetration function (Ψ) and the relatively higher order of the dimensionless parameter Π are considered to be an indication of local chain stiffness. All the results obtained in this study allow us to conclude that the overall chain conformation of PEO assumed in methanol is basically a random coil, but is intermittently mixed with helical structure.

Original languageEnglish
Pages (from-to)4205-4212
Number of pages8
JournalPolymer
Volume48
Issue number14
DOIs
Publication statusPublished - 2007 Jun 29

Keywords

  • Conformational characteristics
  • Poly(ethylene oxide)
  • Third virial coefficient

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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