Influence of clay surface modification on morphology and rheology of polyethylene glycol/montmorillonite nanocomposites

Sevim Işçi, Nurfer Güngör, Ayşe Alemdar*, Ö Isik Ece

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)

Abstract

The effects of surface modification of Na-montmorillonite (Na-MMT) on morphology and the rheological properties of polyethylene glycol/ organoclay nanocomposites are investigated. Dodecyltrimethylammonium bromide (DTABr) is used to modify the clay surface. Adsorption of DTABr on Na-MMT is monitored by zeta potential measurements. From zeta potential measurements, three DTABr concentrations, 1 103, 7.5 103, and 5 102 mol/L, are chosen to fabricate the polyethylene glycol/organoclay composites. The morphology of three sets of organoclays (OMMT1, OMMT2, and OMMT3) is studied by X-ray diffraction (XRD) technique. The increase of basal spacing is found to be 0.2 nm as the DTABr concentration is increased to 7.5 103 mol/L. The rheological properties of polyethylene glycol (PEG)/ organoclay nanocomposites are studied for three organoclays at different PEG concentrations. All nanocomposites show Bingham plastic flow behavior. The OMMT3 shows maximum viscoelastic properties in the polymer matrix. The morphology and electrokinetic properties of the PEG/organoclay nanocomposites are also investigated.

Original languageEnglish
Pages (from-to)1521-1533
Number of pages13
JournalJournal of Composite Materials
Volume41
Issue number12
DOIs
Publication statusPublished - Jun 2007

Keywords

  • Montmorillonite
  • Organoclay
  • Polymer/organoclay composites
  • Rheology
  • Viscoelasticity
  • Zeta potential

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