Title :
Water resistive humidity sensor composed of interpenetrating polymer networks of hydrophilic and hydrophilic and hydrophobic methacrylate
Author :
Sakai, Y. ; Sadaoka, Y. ; Matsuguchi, M. ; Hirayama, K.
Author_Institution :
Dept. of Ind. Chem., Ehime Univ., Japan
Abstract :
An interpenetrating polymer network (IPN) film composed of cross-linked 2-hydroxy-3-methyacryl-oxypropyl trimethylammonium chloride (HMPTAC) polymer and cross-linked ethylene glycol dimethacrylate (EGDMA) polymer was formed on a sintered alumina substrate with interdigitated gold electrodes to fabricate a water-resistive humidity sensor. The impedance of the sensor decreased from ca.10/sup 7/ Omega to ca.10/sup 2/ Omega with increasing humidity from 0% RH to 90% RH. In spite of the cross-linking and interpenetrating with the hydrophobic polymer, the sensitivity is almost the same as that of the HMPTAC homopolymer sensor. Little hysteresis was observed. The characteristics of this IPN sensor changed little even after soaking in water for 120 min. This sensor is more water-resistive than other IPN sensors prepared by using melamine resin or HEMA polymer as a second incorporating polymer. It seems that this is due to the good compatibility of HMPTAC and EGDMA.<>
Keywords :
detectors; humidity measurement; polymer films; cross-linked 2-hydroxy-3-methyacryl-oxypropyl trimethylammonium chloride; cross-linked ethylene glycol dimethacrylate; hydrophilic methacrylate; hydrophobic methacrylate; interdigitated Au electrodes; interpenetrating polymer networks; sintered alumina substrate; soaking; water-resistive humidity sensor; Anti-freeze; Electrodes; Gold; Humidity; Hysteresis; Impedance; Polymer films; Sensor phenomena and characterization; Substrates; Water;
Conference_Titel :
Solid-State Sensors and Actuators, 1991. Digest of Technical Papers, TRANSDUCERS '91., 1991 International Conference on
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-87942-585-7
DOI :
10.1109/SENSOR.1991.148939
