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Poly(2,3‐dimethylaniline) as a competent material for humidity sensor
Author(s) -
Kulkarni Milind V.,
Athawale Anjali A.
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1563
Subject(s) - dimethylaniline , crystallinity , polyaniline , conductivity , relative humidity , polymer , materials science , polymer chemistry , conductive polymer , analytical chemistry (journal) , chemistry , photochemistry , organic chemistry , polymerization , physics , composite material , thermodynamics
Chemically synthesized polyaniline and its ring substituted derivatives such as poly(o‐toluidine), poly(2,3‐dimethylaniline) and poly(2,5‐dimethylaniline) were utilized as sensors for relative humidity (RH) between 6.4% and 97.3%. The conductivity of the polymers was found to decrease on exposure to RH between 6.4% and 75.3%. However, in presence of 97.3% RH the conductivity was seen to increase. A comparison of the observed results reveals that, though each of the polymers responds to various percentages of RH, poly(2,3‐dimethylaniline) shows the best response in terms of sensitivity and linear range. The percent sensitivity was found to be greater for poly(2,3‐dimethylaniline) than that for polyaniline. The observed change in conductivity as well as the degree of change in magnitude of conductivity in the polymers was supported by X‐ray diffraction studies and IR spectroscopy. The X‐ray analysis showed that crystallinity of the polymer changed both in the presence and the absence of a specific percent of RH. Similarly, the IR spectra exhibited variation in the peak intensities of the O—H and >N–H groups. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 1382–1387, 2001