Decomposition of poly(ethylene glycol) in nanocomposites

Biqiong Chen, Julian R G Evans*, Steve Holding

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Poly(ethylene glycol) (PEG) has been widely used in studies of polymer-clay nanocomposites because it readily intercalates in smectite clays. Nanocomposites were formed from PEG with molecular weights (Mw) ranging from 300 to 20,000, as evidenced by expansion of the basal planar spacing of the clay (d001) in X-ray diffraction. However PEG with high molecular weight (≥ 10,000) readily underwent degradation during preparation of composites when heated at low temperature (60°C) due to oxidative attack. Molecular weight distribution determined by gel permeation chromatography showed that this degradation always happened with or without the presence of clay and it became more serious when the molecular weight was higher. The reduction in pH of aqueous PEG solutions after degradation increased with molecular weight. Since d001 was independent of molecular weight over a wide range, such degradation cannot be detected by this method. Precautions against oxidative attack are therefore recommended to avoid decomposition when preparing PEG-clay nanocomposites.

Original languageEnglish
Pages (from-to)548-552
Number of pages5
JournalJournal of Applied Polymer Science
Volume94
Issue number2
DOIs
Publication statusPublished - 04 Aug 2004
Externally publishedYes

Keywords

  • Clay
  • Degradation
  • Molecular weight distribution
  • Nanocomposites
  • Poly(ethylene glycol)

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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