Metastability studies of syndiotactic polystyrene polymorphism

Rong Ming Ho, Chien Pang Lin, Hsien Yin Tsai, Ea Mor Woo

研究成果: Article同行評審

72 引文 斯高帕斯(Scopus)


Polymorphic behavior (i.e., the development of α and β forms) of melt-crystallized syndiotactic polystyrene, sPS, has been studied by structure analysis of FTIR (Fourier transform infrared spectroscopy), WAXD (wide-angle X-ray diffraction), and ED (electron diffraction) as well as thermal analysis of DSC (differential scanning calorimetry). Significant factors that influence the formation of polymorphism were examined and described. Isolated α crystals and β crystals of sPS crystallized at different crystallization temperatures from the melt have been obtained. The equilibrium melting temperatures, Tmo, of both forms were determined by using linear Hoffman-Weeks (H-W) extrapolation and nonlinear H-W treatment. The Tmo (i.e., structural metastability) of β form in sPS was found to be higher than that of α form. The occurrence of phase stability inversion with lamellar size (i.e., morphological metastability) in sPS was recognized. Transformations from α to β phase in the stage of crystal growth or in the heating scanning process have been evidenced. The interlinkage of structural metastability and morphological metastability in sPS polymorphism was examined. The behavior of phase transformation has been successfully interpreted in terms of the stability inversion phase diagram. The formation of the α form is indeed a kinetic result of crystallization.

頁(從 - 到)6517-6526
出版狀態Published - 2000 8月 22

All Science Journal Classification (ASJC) codes

  • 有機化學
  • 聚合物和塑料
  • 無機化學
  • 材料化學


深入研究「Metastability studies of syndiotactic polystyrene polymorphism」主題。共同形成了獨特的指紋。