Summary
Inside a microporous polyethylene film, 2-acrylamido-2-methylpropane sulfonic acid was graft polymerized by ultraviolet irradiation. A humidity sensor was fabricated by depositing gold electrodes on both sides of the grafted film. The impedance was measured as a function of humidity for the acid and alkali salts of sulfonate. The sensor has long term stability and is resistant to water.
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Sakai, Y., Rao, V.L., Sadaoka, Y. et al. Humidity sensor composed of a microporous film of polyethylene-graft-poly-(2-acrylamido-2-methylpropane sulfonate). Polymer Bulletin 18, 501–506 (1987). https://doi.org/10.1007/BF00255333
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DOI: https://doi.org/10.1007/BF00255333