Solid state NMR characterization and flammability of styrene-acrylonitrile copolymer montmorillonite nanocomposite

  • Bourbigot S
  • Vanderhart D
  • Gilman J
 et al. 
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Abstract

This work investigates the melt-processing of styrene-acrylonitrile copolymer (SAN) with organo-modified montmorillonite (MMT) clays and the influence of the clay on mechanical properties and on fire performance of SAN. The nanodispersion of MMT is evaluated qualitatively by X-ray diffraction (XRD) and transmission electronic microscopy (TEM), and quantitatively by solid state nuclear magnetic resonance (NMR). SAN/MMT nanocomposites reveal an intermediate morphology, an intercalated structure with some exfoliation and with the presence of small tactoids, whatever the loading in MMT is. The polymer-clay interfacial area is estimated at 0.5 and the degree of homogeneity characterizing the distribution of MMT platelets is about 40%. The presence of clay in SAN-25 leads to a 'filler effect' increasing the stiffness but decreasing tensile strength of the nanocomposites. It also leads to a significant decrease of peak of heat release rate measured by mass loss calorimetry. © 2004 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Nanocomposite
  • Solid state nuclear magnetic resonance
  • Styrene-acrylonitrile copolymer

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