中华医学超声杂志

应用化学 ›› 1992, Vol. 0 ›› Issue (5): 70-73.

• 研究简报 • 上一篇    下一篇

结晶PET驻极体的分子运动与陷阱性质

张兴元1, 周漪琴2   

  1. 1. 中国科学技术大学材料科学与工程系, 合肥 230026;
    2. 青岛大学化学系, 青岛
  • 收稿日期:1991-02-25 修回日期:1992-02-24 出版日期:1992-10-10 发布日期:1992-10-10

MOLECULAR MOTION AND TRAP PROPERTIES OF CRYSTALLIZED POLY (ETHYLENE TEREPHTHALATE) ELECTRETS

Zhang Xingyuan1, Zhou Yiqin2   

  1. 1. Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026;
    2. Department of Chemistry, Qingdao University, Qingdao
  • Received:1991-02-25 Revised:1992-02-24 Published:1992-10-10 Online:1992-10-10

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摘要： 半晶性的聚对苯二甲酸乙二醇酯(PET)存在不同尺寸运动单元的多重形式的分子运动,而且PET等高聚物前结构欠序、晶界和杂质等缺陷还使电子价带与导带间的禁带中出现局域能级(陷阱),并成为捕获载流子的中心,从而影响载流子的输运性质[1]。分子运动和陷阱性质同时还受到聚集态结构改变的较木影晌。

关键词: 聚对苯二甲酸乙二醇酯, 结晶, 热释电, 分子运动, 陷阱

Abstract: A series of PET films with different crystallinity (Xé) have been made through annealing at 110℃. The α-peak of short-circuit thermally stimulated current (corresponding to Tg) shifted to the higher temperature region when Xe increased. With the rise of Xé, the activation energy of dipolar thermal relaxation for main chain segmental motion in amorphous phase decreased linearly and the time constant of dipolar thermal relaxation increased exponentially.Crystallization by annealing leads to the increase of the trap depth, but the ability to trap charge carriers showed a maximum when Xé was 22%.

Key words: poly(ethylene terephthalate), crystallization, thermally stimulated current, molecular motion, trap

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