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|標題:||Effect of premelting temperatures and molecular weight on the crystallization behavior of syndiotactic polystyrene/montmorillonite nanocomposites||作者:||Wu, T.M.
|關鍵字:||syndiotactic polystyrene;nanocomposite;polymorphism;molecular weight;crystallization kinetics;non-isothermal crystallization;layered silicate nanocomposites;polymorphic behavior;polystyrene/clay nanocomposites;melting behavior;kinetics;crystals;samples;intercalation;state||Project:||Journal of Macromolecular Science-Physics||期刊/報告no：:||Journal of Macromolecular Science-Physics, Volume B43, Issue 2, Page(s) 329-348.||摘要:||
X-ray diffraction methods and differential scanning calorimetry (DSC) have been used to investigate the crystalline structure and crystallization kinetics of syndiotactic polystyrene (sPS)/montmorillonite (MMT) nanocomposites. X-ray diffraction data show the presence of polymorphism in sPS/MMT nanocomposites, which is strongly dependent on the premelting temperatures (T-maxs), MMT content and molecular weight of sPS (referred to as HsPS for higher molecular weight sPS and LsPS for lower molecular weight sPS). This result indicates that the T-maxs, MMT content, and cooling rates all affect the alpha/beta crystalline formation of HsPS/MMT nanocomposites, but T-maxs the dominant factor for the crystalline formation of LsPS/MMT nanocomposites; the latter is probably due to the presence of only stable beta crystalline forms of LsPS if treated at T(maxs)greater than or equal to280degreesC. We also studied the nonisothermal melt-crystallization kinetics, melting behavior, and crystalline structure of sPS/MMT nanocomposites at various cooling rates. The results indicate that the addition of a small amount of MMT into the sPS causes a change of the mechanism of nucleation and growth of sPS crystallites.
|Appears in Collections:||材料科學與工程學系|
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