Korean Journal of Materials Research, Vol.11, No.2, 126-131, February, 2001
반응성 공중합체들을 이용한 습도센서의 감습
Humidity Sensitive Properties of Humidity Sensor Using Reactive Copolymers
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초록
4 차 암모늄염을 형성할 수 있는 공중합체들 poly[(vinylbenzyl chloride)-co-(n-butyl acrylate)-co-(2-hydroxyethyl methacrylate)]와 poly[(4-vinylpyridine)-co-(n-butyl acrylate)-co-(2-hydroxyethyl methacrylate)]를 고분자막 습도센서의 감습재료로 사용하기 위하여 합성하였다. 습도센서는 30%RH, 60%RH 그리고 90%RH에서 평균 저항 값은 각각 8.6 M Ω , 310 k Ω 그리고 12 k Ω 을 보여 주었다. 또한 히스테리시스는 ± 3%RH 안에서 나타났으며, 온도의존성 계수는 -0.37~-0.407RH/ ? C 이었다. 감습막의 조성에서 공중합체 중 n-BA와 HEMA의 도입은 저항을 증가시키는 요인이 되나 기판과의 접착성은 크게 향상되었다. 33%RH에서 85%RH로 또는 역으로 변화할 때의 응답속도는 54초이며 수중에 2시간 침적 후 저항의 변화는 +0.2%RH 이내에서 존재하였다.
The mutually reactive copolymers poly[(vinylbenzyl chloride)-co-(n-butyl acrylate)-co-(2-hydroxyethyl methacrylate)] and poly[(4-vinylpyridine)-co-(n-butyl acrylate)-co-(2-hydroxyethyl methacrylate)] were synthesized for the humidity sensitive material by forming simultaneous quaternization. The humidity sensor showed an average resistance of 8.6 M Ω , 310 k Ω and 12 k Ω at 30%RH, 60%RH and 90%RH, respectively. The hysteresis and temperature coefficient were ± 3%RH and -0.37~-0.40%RH/ ? C . The introduction of n-BA and HEMA increased the resistance of the humidity sensor however it enhanced the adherence to the alumina substrate. The response time was 54 seconds changing from 33%RH to 85%RH and the difference of resistance was +0.2%RH after soaking in water for 2 hr.
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