Phase and crystallization behavior of syndiotactic polystyrene blends

• Main Authors: Lee-Chuan Tseng, 曾李全
• Other Authors: Chi Wang
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/76820153782180138998

碩士 === 國立成功大學 === 化學工程學系碩博士班 === 93 === 　　Syndiotactic polystyrene/isotactic polystyrene blends were prepared in this study. It is to investigate the miscibility behavior by using enthalpy relaxation, OM and SEM. Based on enthalpy relaxation results, phase separation takes place in the sPS/iPS=30/70 and sPS/iPS=50/50 at 300oC. According to the FTIR results, the cold crystallization peaks are related to sPS crystallization. OM and SEM images show that phase separation occurs at 280~320oC in sPS/iPS=30/70、50/50、70/30、85/15 systems. 　　Based on WAXD diffraction patterns, b-form sPS crystals were always obtained from one and two-step melt-crystallization. In two-step crystallization, iPS crystals can only be found in sPS/iPS=30/70 and sPS/iPS=50/50 systems. From TEM images the iPS crystals exist between sPS lamellar stacks.