高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (4): 603.

• 论文 • 上一篇    下一篇

交联聚醚聚氨酯的表征及其聚集态转变和自由体积特性的正电子湮没研究

刘皓1, 过俊石1, 谢洪泉1, 王波2, 李世清2, 王少阶2   

  1. 1. 华中理工大学化学系, 武汉, 430074;
    2. 武汉大学物理系
  • 收稿日期:1993-07-01 修回日期:1993-09-27 出版日期:1994-04-24 发布日期:1994-04-24
  • 通讯作者: 刘皓,男,26岁,博士研究生.
  • 作者简介:刘皓,男,26岁,博士研究生.
  • 基金资助:

    国家自然科学基金

Characterization of Crosslinked Poly (ether urethane)and Study of Its Transitions and Free-Volume Properties with Positron Annihilation

LIU Hao1, GUO Jun-Shi1, XIE Hong-Quan1, WANG Bo2, LI Shi-Qing2, WANG Shao-Jie2   

  1. 1. Department of Chemistry, Huazhong University of Science and Technology, Wuhan, 430074;
    2. Department of Physics, Wuhan University, Wuhan, 430072
  • Received:1993-07-01 Revised:1993-09-27 Online:1994-04-24 Published:1994-04-24

摘要: 采用全反射红外光谱(ATR-IR)对聚合物的结构进行了表征,证明其为交联聚醚聚氨酯(PEU),且其碱金属盐络合物的导电性与其自由体积有关。在110~350K温度范围内测量了PEU的正电子湮没寿命谱,结果表明正电子湮没寿命谱的温度关系可灵敏地反映聚合物的聚集态转变及其自由体积特性随温度的变化。得到了PEU的次级转变、玻璃化转变及结晶相的熔融变化等方面的信息。并由实验测得的o-Ps寿命计算出不同温度下PEU中自由体积孔洞的尺寸。

关键词: 正电子湮没, 聚醚聚氨酯, 玻璃化转变, 次级转变, 自由体积

Abstract: The structure of crosslinked poly(ether urethane)was characterized by ATR-IR,and its conductivity of the polymer complex with LiClO4 is in close relationship with free-volume of the polymer, In the temperature range from 110─350K, lifetime spectra of positron annihilation in PEUhave been measured.The result shows that positron lifetime is sensitive to the transitions and free-volume holes in the polymer.From lifetime spectra we get the informations of secondary transition, glass transition and crystal melting transition.The temperature dependences of the size of free-volume in PEUare calculated from the o-Ps annihilation lifetime.

Key words: Positron annihilation, Poly(ether urethane), Glass transition, Secondary transition, Free-volume

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