Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (1): 10501-010501.doi: 10.11889/j.0253-3219.2017.hjs.40.010501


Effect of soaking on etching of polyimide heavy-ion microfiltration membranes

LIANG Haiying, JU Wei, WU Zhendong, JIAO Xuesheng, CHEN Dongfeng, FU Yuanyong   

  1. China Institute of Atomic Energy, Beijing 102413, China
  • Received:2016-07-05 Revised:2016-11-03 Online:2017-01-10 Published:2017-01-11
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11475267)


Background: Polyimide (PI) film is a new type of organic film possessing properties of high temperature resistance, acid resistance and radiation resistance, etc. The heavy-ion microporous membrane prepared by polyimide film can be used for battery diaphragm, radioactive waste gas filtering and other special areas. Purpose: This study aims to improve the quality of PI heavy-ion micro-filtration membrane by soaking pretreatment. Methods: First of all, 25-μm PI films were irradiated by 32S ions produced by HI-13 tandem accelerator in China Institute of Atomic Energy to break the polymer chains. Latent tracks were created along the track of the ions. Then soaking pretrestment with two types of strong oxidizing solutions, i.e., potassium permanganate and hydrogen peroxide, was conducted before the chemical etching processing to form the micropores. Finally, etching time and the quality of micropores were compared and analyzed. Results: The etching rate for PI film pre-processed by soaking in potassium permanganate solution and hydrogen peroxide solution for 2 h are 1.6 times and 1.3 times respectively, compared with that no soaking pretreatment at normal temperature. More narrow cone angle is formed for faster etching rate. Conclusion: The experimental results showed that soaking pretreatment can obviously increase the track etching rate of PI membrane, decrease etching time, narrow the cone angle of pores and improve the quality of PI heavy-ion microporous membrane.

Key words: Polyimide heavy-ion micro-filtration membranes, Conductance method, Soaking

CLC Number: 

  • TL99