Nanoalloys Based on Clays: Intercalated Semicrystalline Blends of Syndiotactic Polystyrene with Poly(2,6-dimethyl-p-phenylene oxide)
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. Amixed interca- lated/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. Aconsiderable 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-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.
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Document Type: Research Article
Publication date: 2005-02-01
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