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Sulphonic acids doped poly( N ‐ethyl aniline): A material for humidity sensing application
Author(s) -
Kulkarni Milind V.,
Viswanath Annamraju Kasi
Publication year - 2007
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.20838
Subject(s) - materials science , aniline , polymer , polymerization , polymer chemistry , polyaniline , toluene , conductive polymer , thermal stability , conductivity , nuclear chemistry , dopant , chemical engineering , doping , organic chemistry , chemistry , composite material , optoelectronics , engineering
Substituted polyaniline, poly( N‐ ethyl aniline) (PNEA), doped with camphor sulphonic acid (CSA) and p ‐toluene sulphonic acid ( p ‐TSA), was synthesized by single‐step chemical polymerization method using ammonium persulphate as an oxidizing agent. This is a single‐step polymerization process to synthesize directly the conducting emeraldine salt phase of the polymer using CSA and p ‐toluene sulphonic acid as dopants. The synthesized polymers were characterized by UV–vis and FTIR spectroscopy, scanning electron microscopy, TGA/SDTA, DSC, and conductivity measurements. This single‐step chemical synthesis method offers a polymer having very good physicochemical properties with good electrical conductivity. High temperature conductivity measurements show “thermal activated behavior.” The change in resistance with respect to % relative humidity (% RH) is observed, when pressed pellets of the polymer were exposed to the broad range of humidity (ranging between 20 and 100% RH). POLYM. ENG. SCI., 47:1621–1629, 2007. © 2007 Society of Plastics Engineers