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Effect of water on inorganic acids doped polyaniline
Author(s) -
Ayad Mohamad M.,
Zaki Eman. A.
Publication year - 2009
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.30631
Subject(s) - polyaniline , dopant , gravimetric analysis , quartz crystal microbalance , doping , materials science , analytical chemistry (journal) , diffusion , ion , conductive polymer , chemical engineering , chemistry , polymer , composite material , chromatography , organic chemistry , polymerization , thermodynamics , physics , optoelectronics , adsorption , engineering
Abstract Based on gravimetric measurements, the effect of water on thin films of inorganic acids doped polyaniline (PANI) was developed. The starting point was the fact that PANI coating on the electrode of quartz crystal microbalances (QCM) showed significant frequency shifts under exposure to liquid water. The changes in the frequency as a function of treatment time in water were quantitatively measured. These changes suggested that the mass decreases under water exposure were due to dopant ions release. The data have been collected using doped PANI films with HCl, H 2 SO 4 , and H 3 PO 4 . For PANI‐HCl upon immersion in water showed rapid mass loss followed by slow kinetically dopant ions release with time. However, PANI‐H 3 PO 4 and PANI‐H 2 SO 4 showed a slow kinetically release out of the film immediately upon immersion in water. The release process was well described by Fickian diffusion process. The diffusion coefficients ( D ) were determined and found to be dependent on the acid dopant utilized. They varied within the range of (1.68–14.7) × 10 ‐14 cm 2 /s. This work presented an attempt to find a simple method based on the QCM for investigating the diffusion of dopant ions out of thin PANI films upon immersion in water and determining D . © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009