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Supercritical Fluid Assisted Crystal Transition of γ-Form Crystal in Syndiotactic Polystyrene

✍ Scribed by Weiming Ma; Jian Yu; Jiasong He

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
107 KB
Volume
26
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: In different media in the range of approximately 160–240 °C, the γ form of syndiotactic polystyrene was transformed into different crystal forms having different stabilities. Compared with the transition to less stable forms in ambient air and gaseous CO~2~, the γ form transformed into β′ form in supercritical CO~2~ at 240 °C and 12 MPa, and into the more ordered β″ form in supercritical CO~2~ and acetone at the same temperature and pressure.

WAXD patterns of syndiotactic polystyrene samples treated from the γ form at 240 °C under the conditions indicated.

imageWAXD patterns of syndiotactic polystyrene samples treated from the γ form at 240 °C under the conditions indicated.

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✍ E. M. Woo; Fu Sun Wu 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 366 KB 👁 2 views

X-ray diffraction and optical microscopy characterization were performed to evaluate the phenomenon of alteration of polymorphism of syndiotactic polystyrene (s-PS) in the presence of other blending miscible polymers: poly(2,6-dimethyl-pphenylene oxide) (PPO) or atactic polystyrene (a-PS). Both ␣ an