Article
  • Humidity-Sensitive Properties of Carbon-Dispersed Polymeric Membranes
  • Kim DU, Shim JJ, Lee CW, Gong MS
  • 카본 분산형 고분자막의 감습 성질
  • 김대욱, 심재준, 이칠원, 공명선
Abstract
Carbon-dispersed polymeric dew sensor was prepared from poly(1-vinylpyrrloidone-co-acrylic acid) and hydroxypropyl cellulose, followed by the thermal crosslinking reaction. The humidity-sensitive membranes were fabricated on the carbon/alumina electrode by microsiring injection. It was found that the impedance of humidity-sensitive membrane changed with a concentration of carbon, ratio of PVP-AA to PHC, and thickness of humid membrane. In the case of polymeric membrane composed of PVP-AA/HPC=1/1 and 85 wt% of carbon black, the impedance showed ±10 kΩ within 80%RH and increased sharply above 85%RH. Form this results, the carbon-dispersed dew sensor might be used as an on/off switching system at dew point. In addition, the hysteresis, temperature depnedence and frequency dependence were measured and estimated as a dew sensor.

카본 블랙이 분산된 고분자 결로센서를 poly(1-vinylpyrrolidone-co-acrylic acid) (PVP-AA)와 hydroxypropyl celllulose (HPC)를 최종 열에 의한 가교를 통해 제조하였다. 감습막은 카본/알루미나 전극 기판 위에 마이크로 주사기로 도포하였다. 상대습도에 따른 전기적 성질을 측정하였을 때 카본 블랙의 농도와 감습막을 구성하는 고분자의 비율 그리고 도포량의 변화에 따라서 감습특성은 변화하였다. PVP-AA/HPC=1/1이고 카본의 농도가 85 wt%로 이루어진 감습막의 경우 80%RH 이하에서 임피던스는 ±10 kΩ부근에서 나타났으며 고습 멈위인 85%RH 이상에서는 임피던스가 급격히 증가하여 결로점에서 스위칭 작용을 할 수 있는 결로센서의 제작이 가능하였다. 또한 히스테리시스, 온도 의존성 및 주파수 의존성 등의 전기적 성질을 측정하여 결로센서로서 응용성을 평가하였다.

Keywords: dew sensor; carbon-dispersed humid membrane; hydroxypropyl cellulose; poly(1-vinypyrrloidone-co-acrylic acid)

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  • Polymer(Korea) 폴리머
  • Frequency : Bimonthly(odd)
    ISSN 0379-153X(Print)
    ISSN 2234-8077(Online)
    Abbr. Polym. Korea
  • 2023 Impact Factor : 0.4
  • Indexed in SCIE

This Article

  • 1999; 23(4): 617-623

    Published online Jul 25, 1999