Article
  • Preparation and Humidity-Sensitive Properties of Polyelectrolytes Containing Phosphonium Salts
  • Kim O, Gong MS
  • 포스포늄 염을 포함하는 전해질 고분자의 제조 및 감습성질
  • 김오영, 공명선
Abstract
Vinylbenzyl triphenyl phosphonium chloride (VTPC) was prepared for a moisture-absorptive material of humidity sensor. The humidity-sensitive membranes were composed of copolymers of various content of VTPC with styrene, n-butyl acrylate (n-BA), 2-hydroxyethyl methacrylate (HEMA) and 2-ethylhexyl acrylate (EHA). The humidity-sensitive membrane was fabricated on a gold electrode by syringe injection The impedance of humidity-sensitive membrane decreased with an increase of the content of VTPC in the copolymer, therefore the humidity sensitive characteristics were controllable by changing the content of VTPC and comonomers. In the case of copolymer with composition of VTPC/styrene = 50/50, the impedances varied from 350 kΩ to 9.8 kΩ at 25℃ in the range of 80∼ 95%RH. VTPC/n-BA= 10/35 and VTPC/EHA= 50/50 showed 123∼5 kΩ(25℃) and 437∼15 kΩ(20℃). The temperature-dependent coefficient between 5℃ and 35℃ was found to be -0.25% RH/℃ and the hysteresis falled in the ±2%RH range.

Phosphonium염을 포함하는 감습 단량체로서 vinylbenzyl triphenyl phosphonium chloride (VTPC)를 결로검지를 위한 감습막으로 사용하기 위하여 vinylbenzyl chloride와 triphenyl phosphine으로부터 합성하였다. 감습막 성분은 VTPC와 styrene, n-butyl acrylate, 2-hydroxyethyl methacrylate 그리고 2-ethylhexyl acrylate의 2원 및 3원 공중합체들이다. 습도센서는 감습막을 금 전극위에 마이크로 주사기로 주사하여 도포하였다. 감습막의 상대습도 변화에 대한 전기적 성질의 변화를 측정하였을 때 임피던스는 감습막중 VTPC의 함량이 증가할수록 감소하였으며 VTPC와 공단량체의 함량을 변화시켜 감습 특성을 조절하는 것이 가능하였다. 감습막중 단량체의 조성이 VTPC/스티렌=50/50의 공중합체로 이루어진 감습막의 임피던스는 상대습도 80%RH∼95%RH (25℃)에서 350∼9.8kΩ를 보여주었다. 또한 VTPC/n-BA=10/35 그리고 VTPC/EHA=50/50인 공중합체로 이루어진 감습막의 임피던스는 상대습도 80%RH∼95%RH에서 123∼5kΩ(25℃) 그리고 437∼15kΩ(20℃)을 각각 보여주었다. 5∼35℃ 범위에서의 온도 의존상수는 -0.25%RH/℃ 이내의 값을 보여주었으며 히스테리시스는 ±2%RH의 범위 안에서 나타났다.

Keywords: polyelectrolytes humidity sensor; phosphomium saltf; vinylbenzyl triphenyl phosphonium chloride; humid membrane; copolymer

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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

  • 1998; 22(3): 446-454

    Published online May 25, 1998