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|標題:||Effect of the premelting temperature and sample thickness on the polymorphic behavior of syndiotactic polystyrene/clay nanocomposites||作者:||Wu, T.M.
|關鍵字:||syndiotactic;polystyrene;nanocomposites;premelting temperature;sample thickness;layered silicate nanocomposites;crystals;intercalation;conformation;forms||Project:||Journal of Polymer Science Part B-Polymer Physics||期刊/報告no：:||Journal of Polymer Science Part B-Polymer Physics, Volume 41, Issue 14, Page(s) 1730-1738.||摘要:||
X-ray diffraction methods and differential scanning calorimetry thermal analysis have been used to investigate the structural changes of syndiotactic polystyrene (sPS)/clay nanocomposites. sPS/clay nanocomposites have been prepared by the mixing of sPS polymer solutions with organically modified montmorillonite. X-ray diffraction data and differential scanning calorimetry results indicate that the dominating crystal forms and their relative fractions in sPS and sPS/clay nanocomposites are different for various premelting temperatures (T-max's). Higher T-max's favor the formation of the thermodynamically more stable beta-crystalline form, and its relative fraction has been obtained from the X-ray diffraction data in the range of 11.5-13degrees. The intensity of the X-ray diffraction data in the range of 11.5-13degrees decreases as the thickness of sPS/clay nanocomposites decreases from 150 to 20 Am. At the same time, the intensity of the X-ray data in the range of 6-7degrees becomes sharper as the thickness of sPS/clay nanocomposites decreases. The calculation ratio based on the peak intensities at 6.2 and 6.8degrees for sPS/clay nanocomposites of equal thickness and crystallinity in the pure beta and alpha forms has also been determined in this study. (C) 2003 Wiley Periodicals, Inc.
|Appears in Collections:||化學工程學系所|
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