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Citation: HUANG Lin, WU Yu-Cheng, SUN Ai-Hua, LI Yong, CUI Ping. Humidity-sensitive Properties of Salt-doped MEBA-co-KH570 Copolymer[J]. Chinese Journal of Applied Chemistry, ;2010, 27(1): 43-47. shu

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

HUANG Lin ^a ,
WU Yu-Cheng ^a ,
SUN Ai-Hua ^b ,
LI Yong ^b ,
CUI Ping ^b

a.
a. School of Material Science and Engineering, Hefei University of Technology, Hefei 230009;
b.
b. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo

Received Date: 5 January 2009
Available Online: 29 April 2009

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 CaCl₃.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 CaCl₃ 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).
- MEBA-co-KH570 copolymer,
- humidity sensor,
- inorganic salt,
- impedance
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