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Preparation of IPN-type Polyelectrolyte Films Attached to the Electrode Surface and Their Humidity-Sensitive Properties  

Han, Dae-Sang (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
Gong, Myoung-Seon (Department of Nanobiomedical Science and WCU Research Center of Nanobiomedical Science, Dankook University)
Publication Information
Polymer(Korea) / v.34, no.6, 2010 , pp. 565-573 More about this Journal
Abstract
Copoly(2-(dimethylamino)ethyl methacrylate)(DAEMA)/butyl acrylate (BA) and copoly(methyl methacrylate)(MMA)/BA/2-(cinnamoyloxy)ethyl methacryate (CEMA), which were cross-linked 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 $[2{\pi}+2{\pi}]$ 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 dip-coating on their humidity sensitive properties including water durability were investigated.
Keywords
humidity sensor; IPN; photo-crosslinking; cinnamate; water durability;
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