- Author
-
Bourbigot, S. P.
|
Vanderhart, D. L.
|
Gilman, J. W.
|
Bellayer, S.
|
Stretz, H.
|
Paul, D. R.
- Title
- Solid State NMR Characterization and Flammability of Styrene-Acrylonitrile Copolymer Montmorillonite Nanocomposite.
- Coporate
- National Institute of Standards and Technology, Gaithersburg, MD
Texas State University, San Marcos, TX
University of Texas, Austin, TX
- Journal
-
Polymer,
Vol. 45,
No. 22,
7627-7638,
October 2004
- Keywords
-
copolymers
|
nonocomposites
|
solid state
|
flammability
- Identifiers
- solid state nuclear magnetic resonance; styrene-acrylonitrile copolymer
- 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.