Journal of Materials Science

, Volume 24, Issue 1, pp 101–104 | Cite as

Humidity sensor using microporous film of polyethylene-graft-poly-(2-hydroxy-3-methacryloxypropyl trimethyl-ammonium chloride)

  • Y. Sakai
  • Y. Sadaoka
  • M. Matsuguchi
  • V. L. Rao


An hydrophilic monomer, 2-hydroxy-3-methacryloxypropyl trimethylammonium chloride, was graft-polymerized in a microporous polyethylene film using three different initiation methods, that is, with benzyl peroxide, pre-U.V. irradiation and mutual photo-initiation. Humidity dependence of the impedance was measured for the grafted microporous polyethylene films. Among the three graft polymers, the one prepared by pre photo-irradiation seems to have the most homogeneously grafted layer. The impedance increases as the grafting percentage increases except in the low grafting percentage region. The response time for the abrupt change of humidity becomes longer as the grafting percentage increases. The activation energy for conductivity has a maximum at 40% relative humidity in the plot of activation energy against humidity.


Polymer Peroxide Activation Energy Relative Humidity Response Time 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    F. W. Dunmore,J. Research NBS 20 (1938) 723.Google Scholar
  2. 2.
    M. Hijikigawa, S. Miyoshi, T. Sugihara andA. Jinda,Sensors and Actuators 4 (1983) 307.Google Scholar
  3. 3.
    N. Kinjo, O. Ohara, T. Sugawara andT. Tsuchitani,Polym. J. 15 (1983) 621.Google Scholar
  4. 4.
    Y. Takaoka, Y. Maebashi, S. Kobayashi andT. Usui, Jpn Tokkyo Koho (Japanese Patent Journal), 58-16467 (1983).Google Scholar
  5. 5.
    Y. Sadaoka andY. Sakai,Denki Kagaku 52 (1984) 132.Google Scholar
  6. 6.
    Y. Sakai, Y. Sadaoka, H. Omura andN. Watanabe,Kobunshi Ronbunshu 41 (1984a) 205.Google Scholar
  7. 7.
    K. Sakai, Y. Sadaoka, S. Okumura andK. Ikeuchi,Kobunshi Ronbunshu 41 (1984b) 209.Google Scholar
  8. 8.
    Y. Sakai andY. Sadaoka,Denki Kagaku 53 (1985) 150.Google Scholar
  9. 9.
    Y. Sadaoka, Y. Sakai andH. Akiyama,J. Mater. Sci. 21 (1986a) 235.Google Scholar
  10. 10.
    Y. Sadaoka andY. Sakai,J. Mater. Sci. Lett. 5 (1986b) 772.Google Scholar
  11. 11.
    Y. Sakai, Y. Sadaoka andK. Ikeuchi,Sensors and Actuators 9 (1986) 125.Google Scholar
  12. 12.
    Y. Sakai, Y. Sadaoka andH. Fukumoto,Sensors and Actuators 13 (1988) 243.Google Scholar

Copyright information

© Chapman and Hall Ltd 1989

Authors and Affiliations

  • Y. Sakai
    • 1
  • Y. Sadaoka
    • 1
  • M. Matsuguchi
    • 1
  • V. L. Rao
    • 1
  1. 1.Department of Industrial Chemistry, Faculty of EngineeringEhime UniversityMatsuyamaJapan

Personalised recommendations