화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Polymer(Korea), Vol.34, No.6, 565-573, November, 2010
Export Citation
전극 표면에 부착된 IPN 형태의 전해질 고분자의 제조 및 그들의 감습특성
Preparation of IPN-type Polyelectrolyte Films Attached to the Electrode Surface and Their Humidity-Sensitive Properties
한대상, 공명선†
  • 단국대학교 나노바이오의과학과
Dae-Sang Han, and Myoung-Seon Gong†
  • Deparment of Nanobiomedical Science and WCU Research Center ofNanobiomedical Science, Dankook University, Chungnam 330-714, Korea
E-mail:
초록
IPN 구조를 가지는 감습성 고분자 전해질로 사용하기 위하여 디브로모알칸과 가교가 가능한 copoly(2-(dimethylamino) ethyl methacrylate)(DAEMA)/butyl acrylate(BA)와 광가교가 가능한 copoly(methyl methacrylate) (MMA)/BA/2-(cinnamoyloxy)ethyl methacryate(CEMA)를 제조하였다. 전극의 기재 표면에 광조사에 의한 IPN-감습성 전해질의 부착을 위하여 3-(triethoxysilyl)propyl cinnamate(TESPC)을 전극표면에 처리하였다. IPN 구조의 감습성 고분자 필름은 copoly(DAEMA/BA), copoly(MMA/BA/CEMA) 및 1,4-dibromobutane(DBB) 가교제의 혼합 용액에 침적한 후에 UV 조사와 동시에 가열하여 제조하였다. IPN-전해질 고분자의 전극 기재와의 부착은 광화학적 [2π+2π] 환화반응에 의하여 진행하였다. 얻어진 습도센서는 20∼95%RH의 영역에서 매우 높은 감도와 1.5%RH 이하의 작은 히스테리시스를 보여주었다. 또한, 33∼94%RH 사이에서 가습과 제습과정의 응답 및 회복 속도는 각각 48초와 65초로 나타나 매우 빠름을 알 수 있었다. 그 밖에 감습액 중의 공중합체의 농도, 가교제의 양, 가교반응 시간 등이 내수성을 포함한 감습성질에 미치는 영향을 조사하였다.
Copoly(2-(dimethylamino)ethyl methacrylate)(DAEMA)/butyl acrylate (BA) and copoly(methyl methacrylate)(MMA)/BA/2-(cinnamoyloxy)ethyl methacryate (CEMA), which were crosslinked with dibromoalkane and UV irradiation, respectively, were prepared for the precursors of interpenetrating polymer network (IPN) humidity-sensitive films. 3-(Triethoxysilyl)propyl cinnamate (TESPC) was used as a surface-pretreating agent for the attachment of IPN-polyelectrolyte to the electrode surface by UV irradiation. Humidity sensitive polymeric thin films with an IPN structure were prepared by crosslinking reactions of copoly(DAEMA/BA) with 1,4-dibromobutane (DBB) and copoly(MMA/BA/CEMA) by UV-irradiation. The anchoring of an IPN-polyelectrolyte into the substrate was carried out via the photochemical [2π+2π] cycloaddition. The resulting humidity sensors showed a high sensitivity in the range of 20∼95%RH and a small hysteresis (<1.5%RH). The response time for adsorption and desorption process at 33∼94%RH was 48 and 65 s, respectively, indicating a fast response. The effects of the concentration of copolymers, molar ratio of crosslinking agents and time of the precursor solution for dipcoating on their humidity sensitive properties including water durability were investigated.
Keywords:humidity sensor;IPN;photo-crosslinking;cinnamate;water durability
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