Humidity sensor using cross-linked poly (chloromethyl styrene)
A resistive-type humidity sensor was prepared using a
poly(chloromethyl styrene) (PCMS) film which was simultaneously cross-linked
and quaternized. The impedance dependence on humidity for samples with various
reaction degrees was measured. The sorption isotherm curves of water vapor in
the cross-linked films were obtained using the quartz crystal microbalance
method for the various samples. It was found that the degree of hysteresis
depends on the density of the quaternary ammonium group, which affects the
diffusion coefficient of the water molecules in the film.
oshiro Sakai received his BS degree in chemistry from Kyushu University
in 1958. From 1958 until 1968 he was a research chemist at the Government
Industrial Research Institute. In 1968 he was appointed Associate Professor in
industrial chemistry at Ehime
University. He received
his Doctor of Science degree from Kyushu
University for his
studies on ESR of methacrylate radical in 1970. Since 1974 he has been
Professor in the Department of applied Chemistry of Ehime University. His main
interests are properties of functional polymers and applications in the field
of chemical sensors.
Masanobu
Matsuguchi received his BS and MS degrees in chemistry, from Kyushu University
in 1984 and 1986, respectively. After graduating, he is now a lecturer in the
Department of Applied Chemistry of Ehime University. In 1994, he received his
Doctor of Science degree from Kyushu
University of his studies
on water sorption behavior in hydrophilic film. His research is on gas sensors
using polymer materials.
Teruyuki
Hurukawa
received his B.E. and M.E. degree in applied chemistry from Ehime University
in 1996 and 1998, respectively. He is now working for Nishikawa Rubber
Industry.
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