Epoxy-organoclay nanocomposites: Morphology, moisture absorption behavior and thermo-mechanical properties

Chugang Hu, Jang Kyo Kim

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

The morphology and moisture barrier characteristics are studied of epoxy-based nanocomposites reinforced with layered silicates. Two different types of organoclay, including the quaternary alkylamine modified montmorillonite (KH-MT) and the octadecylamine modified montmorillonite (I30P), were studied. The X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicate that the I30P system exhibited a large increase in interlayer d-spacing from 3.39 mm to over 8 nm during the curing process, whereas the KH-MT system showed negligible changes in reflection angle and d-spacing, with the final interlayer distance of 3.39 nm after cure. The moisture absorption behaviour was different for different organoclays: the moisture absorption rate was similar for the neat polymer and the KH-MT system, which could be fitted to Fick's second law. The moisture absorption rate of the I30P system was much lower than the two systems, which was predicted using a non-Fickian model based on the ID Langmuirian solution. The deviation from the Fickian diffusion for the latter system is associated with exfoliated morphology and more uniform dispersion of clay particles, which altered the diffusion path of water molecules in the nanocomposite. The moisture diffusivity of nanocomposites in general decreased with increasing clay content, the reduction being more pronounced for the I30P system. The normalized permeability also showed a systematic degradation with increasing clay content, which agrees well with the prediction based on the tortuous path model.

Original languageBritish English
Pages (from-to)271-289
Number of pages19
JournalComposite Interfaces
Volume12
Issue number3-4
DOIs
StatePublished - 2005

Keywords

  • Epoxy-clay nanocomposite
  • Exfoliation
  • Intercalation
  • Moisture diffusivity
  • Moisture permeation
  • Non-Fickian model

Fingerprint

Dive into the research topics of 'Epoxy-organoclay nanocomposites: Morphology, moisture absorption behavior and thermo-mechanical properties'. Together they form a unique fingerprint.

Cite this