高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (9): 1526.

• 研究快报 • 上一篇    下一篇

冰冻升华极稀溶液制备的iPS超细粉末结晶的结构与性质

王松, 戴庆平, 洪建民, 严晓虎, 程镕时   

  1. 南京大学化学系, 南京, 210093
  • 收稿日期:1998-04-14 出版日期:1998-09-24 发布日期:1998-09-24
  • 通讯作者: 程镕时
  • 作者简介:王松,女,43岁,博士研究生.
  • 基金资助:

    国家"攀登计划"与自然科学基金(批准号:29404030)资助课题.

Crystal Structures of Isotactic Polystyrene Ultrafine Particles

WANG Song, DAI Qing-Ping, HONG Jian-Min, YAN Xiao-Hu, CHENG Rong-Shi   

  1. Department of Chemistry, Nanjing University, Nanjing, 210093
  • Received:1998-04-14 Online:1998-09-24 Published:1998-09-24

关键词: iPS, 超细粉末, 结晶

Abstract: Ultrafine particles, with average equivalent diameters in the range of 60~330 nm, prepared by freeze-drying very dilute(about 2×10-5 g/mL) solutions of isotactic polystyrene in benzene at 0 ℃ were studied by TEMand DSC, respectively. It was found that two different structures of widely different thermal stabilities can form at identicaltemperatures. One melt(mode A) at 220 ℃ just as the recognized structure of isotactic polystyrene(31 helix). The other(mode B) melt at 65 ℃ and produced distinct electron diffraction patterns which, however, differ decisively from those provided by crystals A. The melting point of crystals Bis also significantly lower than those of iPSdried gel crystals, which give an endotherm at 120 ℃ in calorimetric measurements. According to 13 C NMR measurement, the material used in this study should be practically fullyisotactic.

Key words: Isotactic polystyrene, Ultrafine particles, Crystallization

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