Nanoalloys based on clays: Intercalated semicrystalline blends of syndiotactic polystyrene with poly(2,6-dimethyl-p-phenylene oxide)

Arup K. Ghosh, E. M. Woo, Chean C. Su

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Nanoalloys of syndiotactic polystyrene with poly(2,6-dimethyl-p-phenylene oxide) clay were prepared by a solution intercalation technique using 1,1,2,2-tetrachloroethane. A mixed intercalated/exfoliated morphology in the nanoalloys containing organo-clays is evinced by transmission electron microscopy. Thermal stability is found to improve with 5% by weight of organo-clays, but a reverse trend is observed by increasing the concentration of clay. The influence of montmorillonite clays in isothermal melt-crystallization behavior of blends was thoroughly investigated by using differential scanning calorimetry and wide-angle X-ray diffraction. A considerable change in polymorphic behavior of syndiotactic polystyrene is observed by the incorporation of different clays into the blends, and the temperature window of isothermal crystallization for the formation of α a-crystals of syndiotactic polystyrene is found to broaden in the presence of organo-clays. In contrast, the pristine clay is found to induce only the β-crystal of syndiotactic polystyrene at all the crystallization temperatures studied in this work. The amorphous component poly(2,6-dimethyl-p-phenylene oxide) affects the crystallinity of syndiotactic polystyrene adversely and favors the β-form of syndiotactic polystyrene in blends; α-crystals are observed in the nano-alloys containing 20 wt% of poly(2,6-dimethyl-p-phenylene oxide). The crystalline morphology, as characterized by polarized optical microscopy, clearly indicates rapid formation of the α-form induced by the nanoscale dispersion of organo-clays in spherulites of smaller dimension.

Original languageEnglish
Pages (from-to)323-333
Number of pages11
JournalJournal of Nanoscience and Nanotechnology
Issue number2
Publication statusPublished - 2005 Dec 1

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics


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