中国物理B ›› 2017, Vol. 26 ›› Issue (5): 57802-057802.doi: 10.1088/1674-1056/26/5/057802

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Tunable monoenergy positron annihilation spectroscopy of polyethylene glycol thin films

Peng Kuang(况鹏), Xiao-Long Han(韩小龙), Xing-Zhong Cao(曹兴忠), Rui Xia(夏锐), Peng Zhang(张鹏), Bao-Yi Wang(王宝义)   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    2 University of Chinese Academy of Sciences, Beijing 100039, China;
    3 School of Chemical Engineering, Northwest University, Xi'an 710069, China
  • 收稿日期:2017-01-20 修回日期:2017-02-23 出版日期:2017-05-05 发布日期:2017-05-05
  • 通讯作者: Bao-Yi Wang E-mail:wangboy@ihep.ac.cn
  • 基金资助:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11575205, 11475197, 11675188, and 11475193).

Tunable monoenergy positron annihilation spectroscopy of polyethylene glycol thin films

Peng Kuang(况鹏)1,2, Xiao-Long Han(韩小龙)3, Xing-Zhong Cao(曹兴忠)1, Rui Xia(夏锐)1, Peng Zhang(张鹏)1, Bao-Yi Wang(王宝义)1,2   

  1. 1 Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;
    2 University of Chinese Academy of Sciences, Beijing 100039, China;
    3 School of Chemical Engineering, Northwest University, Xi'an 710069, China
  • Received:2017-01-20 Revised:2017-02-23 Online:2017-05-05 Published:2017-05-05
  • Contact: Bao-Yi Wang E-mail:wangboy@ihep.ac.cn
  • Supported by:

    Project supported by the National Natural Science Foundation of China (Grant Nos. 11575205, 11475197, 11675188, and 11475193).

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摘要：

Doppler broadening and coincidence Doppler broadening of annihilation radiation experiments have been performed in three kinds of polyethylene glycol (PEG) membrane formed with different average molecular weight using the tunable monoenergy slow positron probe as a function of implantion energy. The obtained positron annihilation parameters are interpreted from two aspects: surface effect and differences in micro-structure or chemical environment of positron annihilation. The experimental results show that the regulation of densification of PEG molecular packing and distribution uniformity from the near surface layer to the bulk region in the film forming process can be well realized by changing its molecular weight. Combining a variable monoenergetic slow positron beam and these two positron annihilation spectroscopy methods is a powerful tool to study positron annihilation characteristics and for polymeric thin-film fine structure analysis.

关键词: slow positron, coincidence Doppler broadening, micro-structure, polyethylene glycol membranes

Abstract:

Doppler broadening and coincidence Doppler broadening of annihilation radiation experiments have been performed in three kinds of polyethylene glycol (PEG) membrane formed with different average molecular weight using the tunable monoenergy slow positron probe as a function of implantion energy. The obtained positron annihilation parameters are interpreted from two aspects: surface effect and differences in micro-structure or chemical environment of positron annihilation. The experimental results show that the regulation of densification of PEG molecular packing and distribution uniformity from the near surface layer to the bulk region in the film forming process can be well realized by changing its molecular weight. Combining a variable monoenergetic slow positron beam and these two positron annihilation spectroscopy methods is a powerful tool to study positron annihilation characteristics and for polymeric thin-film fine structure analysis.

Key words: slow positron, coincidence Doppler broadening, micro-structure, polyethylene glycol membranes

中图分类号:  (Positron annihilation)

  • 78.70.Bj
61.05.-a (Techniques for structure determination) 68.47.Mn (Polymer surfaces)