中华医学超声杂志

应用化学 ›› 1988, Vol. 0 ›› Issue (2): 44-47.

• 研究论文 • 上一篇    下一篇

取向PET薄膜偶极热松弛的研究

张兴元1, 张贤2, 周漪琴3, 章吉祥3   

  1. 1. 中国科学技术大学应用化学系, 合肥;
    2. 中国科学院化学研究所, 北京;
    3. 青岛大学化学系
  • 收稿日期:1987-01-15 修回日期:1987-03-31 出版日期:1988-04-10 发布日期:1988-04-10

STUDY OF THERMAL DEPOLARIZATION OF DIPOLES IN ORIENTED PET FILMS

Zhang Xingyuan1, Zhang Xian2, Zhou Yiqin3, Zhang Jixiang3   

  1. 1. Department of Applied Chemistry, University of Science and Technology of China, Hefei;
    2. Institute of Chemistry, Academia Sinica;
    3. Department of Chemistry, Oingdao University
  • Received:1987-01-15 Revised:1987-03-31 Published:1988-04-10 Online:1988-04-10

PDF

420

被引次数

5

摘要： 用纵拉、先纵后横、纵-横-纵等拉伸方式得到了各种平面取向程度的PET薄膜.短路热释电流温谱显示α峰随平面取向度增大向高温线性移动.被冻结的大分子主链链段偶极热松弛活化能随反式构象含量增大呈线性下降.热松弛时间常数则随反式构象含量增大而增长.

关键词: 聚对苯二甲酸乙二醇酯, 薄膜, 取向, 偶极热松弛, 构象

Abstract: series of PET films with different degree of plannar orientation were obtained by uniaxial as well as biaxial stretching. The α peak of short-circuit thermally stimulated current was shifted to higher temperature when the degree of plannar orientation was increased. The activation energy of thermal depolarization of dipoles for main-chain segmental motion in amorphous regions was decreased linearly and the time constant τo of dipolar thermal relaxation was increased with the increase of the content of trans conformation.

Key words: Polyethylene, glycol terephthalate, Film orientation, Dipolar thermal, relaxatton, Conformation

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