2-Methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide를 이용한 고분자 습도센서의 감습 특성 및 신뢰성

이칠원; 공명선

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.3, 461-466, May, 1999

Humidity-Sensitive Characteristics and Reliabilities of Polymeric Humidity Sensors Using 2-Methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide

이칠원, 공명선

초록

암모늄염을 포함하는 고분자 습도센서를 2-methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide (MDHAB)/MMA/DAEMA = 6/3/1의 공중합체로부터 제조하였다. 감습막은 금/알루미나 전극에 침적법에 의하여 도포하였으며 5℃, 40%RH, 70%RH, 그리고 90%RH에서 전형적인 임피던스는 각각 298kΩ, 11kΩ, 그리고 2.3kΩ을 나타내어 감습특성은 저온에서 사용되는 습도 센서로서의 특성에 적합하였다. 온도 의존성 계수는 5∼20℃에서 -0.80%RG/℃이었으며 히스테리시스는 ±2%RH 이내에 존재하였다. 응답 속도는 34%RH에서 88%RH로 변화할 때 38초였다. 신뢰성 시험으로서 온도 사이클, 습도 사이클, 고온·고습 저항성, 전기 인가, 장기 방치, 그리고 내수성을 측정하여 습도센서로서의 응용성을 평가하였다.

The humidity sensor containing ammonium salt was prepared from the copolymer of 2-methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide (MDHAB)/MMA/DAEMA = 6/3/1. The humid membrane was fabricated on the gold/alumina electrode by dipping. The impedances were 298kΩ, 11kΩ, and 2.3kΩ at 40%RH, 70%RH and 90%RH, respectively, at 5℃ and the humidity-sensitive characteristics were suitable for low temperature humidity sensor. The temperature-dependent coefficient between 5℃ and 20℃ was found to be -0.80%RH/℃ and the hysteresis falled in the ±2%RH range. The response time was found to be 38 sec for the relative humidity ranging from 34%RH to 88%RH at 20℃. The reliabilities such as temperature cycle, humidity cycle, humidity cycle, high temperature and humidity resistance, electrical load stability, stability of long-term storage and water durability were measured and evaluated for the application as a humidity sensor.

Keywords:Humidity Sensor;2-Methacryloxyethyl dimethyl 2-hydroxyethyl ammonium bromide;Reliability;Cross-linked Copolymer

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[2] Otsuki S, Dozen Y, Kobunshi Ronbunshu, 45, 549 (1988)

[3] Sadaoka Y, Sakai Y, J. Mater. Sci., 21, 235 (1986)

[4] Sakai Y, Sadaoka Y, Okumura S, Ikeuchi K, Kobunshi Ronbunshu, 41, 209 (1984)

[5] Kim JT, Paek JS, Gong MS, Polym.(Korea), 19(5), 561 (1995)

[6] Sakai Y, Sadaoka Y, Ikeuchi K, Sens. Actuator, 9, 125 (1986)

[7] Paek JS, Gong MS, Korean J. Mater. Res., 5, 715 (1995)

[8] Sakai Y, Sadaoka Y, Matsuguchi M, J. Electrochem. Soc., 136, 171 (1989)

[9] Sakai Y, Sadaoka Y, Matsuguchi M, Moriga N, Shimada M, Sens. Actuator, 16, 359 (1989)

[10] Sakai Y, Sadaoka Y, Fukumoto H, Sens. Actuator, 13, 243 (1988)

[11] Paek JS, Lee RY, Park JK, Gong MS, Polym.(Korea), 18(5), 842 (1994)

[12] Bae JS, Gong MS, Polym.(Korea), 20(6), 996 (1996)

[13] "Humidity Sensors Manual," Association of Humidity Measuring Sensors, Japan (1990)

[14] "Handbook of Materials and Moisture," Kyoritsu Publish., p. 151-167 (1990)

[15] Kim OY, Gong MS, J. Korean Ind. Eng. Chem., 9(4), 554 (1998)