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Humidity Sensor of Polymethacrylate with 4th Ammonium Salt  

Hong, Chae-Hwan (Hyundai-Kia Motors Co., Ltd.)
Kim, Se-Hoon (K-Won Electronic)
Nam, Byeong-Uk (Department of Chemical Engineering, Korea University of Technology Education)
Publication Information
Polymer(Korea) / v.31, no.3, 2007 , pp. 255-262 More about this Journal
Abstract
In this work, two types of copolymers are manufactured by a radical polymerization to develop a material for humid membrane. Each copolymer contains three monomers that have functions to improve humid-resistance, membrane stability, flexibility, impedance, and adhesion to the electrode. MDBAB (N,N'-dimethyl-2-methacryloxyethyl-3-bromopropyl ammonium bromide) having a salt form decreases the impedance of the humid membrane and reacts with amines to produce a cross-linking structure. HEMA (2-hydroxyethyl methacrylate) has an important role which reduces the impedance and increases the adhesion strength to the electrode. The other monomers are DAEMA (N,N'-dimethylamino ethyl methacrylate), 4-VP(4-vinyl pyridine), and 2-EHA(2-ethylhexyl acrylate) and all the monomers are formulated with several compositions to make a humid membrane. At specific composition, we could attain a satisfactory results having good performance and long term durability.
Keywords
humidity sensor; radical polymerization; membrane;
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