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Self-Curable Humidity-Sensitive Polyelectrolytes Attached to the Alumina Substrate for the Humidity Sensor and their Stability in Water  

Han, Dae-Sang (Department of Nanobiomedical Science, Dankook University)
Gong, Myoung-Seon (Department of Nanobiomedical Science, Dankook University)
Publication Information
Polymer(Korea) / v.34, no.4, 2010 , pp. 313-320 More about this Journal
Abstract
New cinnamate group-containing copolymers for a self-curable, humidity-sensitive polyelectrolyte and polymeric anchoring agents were prepared by copolymerization of [2-[(methacryloyloxy) ethyl]dimethyl]propyl ammonium bromide(MEPAB), methyl methacrylate(MMA), 3-(trimethoxysilyl) propyl methacrylate(TMSPM) and 2-(cinnamoyloxy)ethyl methacrylate(CEMA). Photocrosslinkable copolymer composed of MEPAB/MMA/TMSPM/CEMA＝70/20/0/10 were used for humidity-sensitive membrane, and those of 50/0/20/30 and 0/0/50/50 were used for polymeric anchoring agents. 3- (Triethoxysilyl)propyl cinnamate(TESPC) was also used as a surface-pretreating agent for the comparison of capability of attachment of polyelectrolyte to the electrode surface with polymeric photocurable silanecoupling agents. Pretreatment of the electrode substrate with anchoring agents was performed to form a cinnamate thin film on the electrode through covalent bonds. When the sensors were irradiated with UV light, the anchoring of a polyelectrolyte into the substrate was carried out via the [2$\pi$+2$\pi$] cycloaddition. The resulting sensors using polymeric anchoring agents and TESPC showed water durability with increase of resistance by 60~85%, which is corresponding to the reduction of 2.25~3.15%RH, after soaking in water for 24 h. They showed good hysteresis (-0.2%RH), response time (90 sec) and long-term stability at high temperature and humidity.
Keywords
humidity sensor; anchoring; polyelectrolyte; photocrosslinking; cinnamate; water durability;
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Times Cited By KSCI : 7  (Citation Analysis)
Times Cited By Web Of Science : 3  (Related Records In Web of Science)
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