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Comparison of silicate layer spacings in nanocomposites with the polymer matrices by wide angle x-ray diffraction and transmission electron microscopy microscopy indicate that the modified silicate layer is slightly more dispersed in the nitrile copolymer system than in the high-...

Morphology of polymer/silicate nanocompositesHigh density polyethylene and a nitrile copolymer

Polymer Bulletin, no. 1 (1998): 107-113

Cited by: 312|Views10

Abstract

Summary   Nanoscale composites of a modified silicate with either high-density polyethylene (HDPE) or a nitrile copolymer have been examined. Hydrophilic silicate clay was intercalated by ion exchange reaction of alkylammonium ions. X-ray diffraction (XRD) and transmission electron microscopy (TEM) results revealed that so-modified sil...More

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Introduction
  • Because of the highly anisometric planar geometry of clay minerals comprising layered silicates and the potential for their molecular level dispersion, there has been considerable interest in the properties of polymer-clay hybrids.
  • They exhibit physical and chemical properties that differ significantly from that of their bulk counterparts.
  • The impact resistance and the heat distortion temperature of epoxy resin were enhanced by dispersion of nanoscale silicate particles
Highlights
  • Because of the highly anisometric planar geometry of clay minerals comprising layered silicates and the potential for their molecular level dispersion, there has been considerable interest in the properties of polymer-clay hybrids
  • Figure 1 shows the x-ray diffractogram of Na-montmorillonite and the product prepared from the ion exchange reaction of Na-montmorillonite and dodecylamine
  • We investigated the morphology of modified silicate filler in the high-density polyethylene (HDPE) and nitrile copolymer matrices
  • The hydrophilic clay was successfully intercalated with dodecylamine by ion exchange reaction
  • Comparison of silicate layer spacings in nanocomposites with the polymer matrices by wide angle x-ray diffraction and transmission electron microscopy (TEM) microscopy indicate that the modified silicate layer is slightly more dispersed in the nitrile copolymer system than in the HDPE system
  • HDPE crystalline lamellae, similar to those found in pure HDPE samples, in the nanocomposites are parallel to the silicate layers
Results
  • Results and discussion

    Figure 1 shows the x-ray diffractogram of Na-montmorillonite and the product prepared from the ion exchange reaction of Na-montmorillonite and dodecylamine.
  • Since a monolayer of water separates the layers in the original Na-montmorillonite and occupies a space of ~ 2.0 Å, the interlayer spacing when dodecylamine is present is ~ 6.7 Å.
  • This value indicates that the alkyl chain is neither lying flat on the clay surface, nor extending perpendicular from it.
  • Instead it suggests that chains are packed in a tilted arrangement with respect to the silicate surface
Conclusion
  • The authors investigated the morphology of modified silicate filler in the HDPE and nitrile copolymer matrices.
  • The hydrophilic clay was successfully intercalated with dodecylamine by ion exchange reaction
  • These modified silicates could be finely dispersed in benzonitrile.
  • HDPE crystalline lamellae, similar to those found in pure HDPE samples, in the nanocomposites are parallel to the silicate layers
  • Owing to their dispersion and morphology, the enhancement of barrier and mechanical properties for the nanocomposite systems is expected
Funding
  • We thank the Edison Polymer Innovation Corporation, BP Chemicals, Inc., NSF CMMC, and ACS PRF #31333-G7 for financial support of this work
Reference
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