掺盐MEBA-co-KH570共聚物的湿敏性能

Humidity-sensitive Properties of Salt-doped MEBA-co-KH570 Copolymer

采用甲基丙烯酸二甲氨基乙酯的溴代丁烷季铵盐和硅烷偶联剂KH570的共聚物作为感湿聚合物,并向该聚合物中掺杂LiCl、CaCl2、FeCl33种不同的盐类,制备了高分子电阻型湿敏元件,系统研究了聚合物浓度、无机盐的种类和浓度对元件湿敏性能的影响。结果表明,在33%～95%RH湿度范围内,元件显示出较高的灵敏度(b为-0.043 8～-0.038 8)和较好的线性(R为-0.994 8～-0.981 6),且阻抗随聚合物浓度的增加而下降,但响应变慢;掺杂LiCl和CaCl2可使元件阻抗变小,掺杂FeCl3却使元件阻抗增大;在1×10-2mol/L的最佳LiCl掺杂浓度下,元件具有最好的灵敏度(b=-0.044 6)和最短的脱湿时间(20 s)。

Several resistive-type humidity sensors were prepared from copolymer of [2-（methacryloyloxy）ethyl]dimethyl butyl ammonium bromide（MEBA） and γ-methacryloxypropyl trimethoxy silane（KH570） and used as humidity-sensitive material,which were respectively doped with inorganic salt LiCl,CaCl2 or FeCl3.The effects of concentrations of polymer,type of doped inorganic salt,doping concentration of salt on humidity-sensitive properties of the humidity sensors were examined.The experimental results show that these humidity sensors exhibited high sensitivities（b=-0.043 8^-0.038 8） and good linearities（R=-0.994 8^-0.981 6） in a humidity range of 33%~95%RH.Increasing the concentration of polymer resulted in impedance,decrease but slower response.In addition,doping LiCl and CaCl2 caused the impedance decreases,while FeCl3 doping exhibited a different behavior.At an optimal doping concentration（1×10-2 mol/L） of LiCl,the sensor exhibits the best sensitivity（b=-0.044 6） and the shortest desorption time（20 s）.