The relative amount of water absorbed by the coatings was
studied by FTIR spectroscopy in the ATR mode. For all systems,
a growth of two bands within the 3800–3000 cm−1 region and
around 1640 cm−1 was observed upon immersion in 3.5% NaCl solution.
These bands are respectively related to the stretching, (OH)
and in plane bending, ı(OH) of water molecules. Up to a 15% difference
in maximum absorbance was observed for two different
pieces of the same wet material. Consequently, no quantitative
analysis of the water diffusion was performed. Nevertheless, the
results in Fig. 7 demonstrate a clear effect of PANI content and
nature of dopant on sorption. It can be seen that PANI–LS1 and
PANI–BS have a negative effect on the sorption properties. The
amount of water absorbed increases with the amount of these
additives. On the contrary, PANI–LS2 additives seems to have a positive
effect on the sorption properties as indicated by the lower
amount of absorbed water than all other systems. It is tempting
to draw a parallel between the conductivity of PANI–LSs and
their effect on sorption process, namely a low conductivity of the
PANI–LS is beneficial to the water absorption properties of the
coating.
The relative amount of water absorbed by the coatings wasstudied by FTIR spectroscopy in the ATR mode. For all systems,a growth of two bands within the 3800–3000 cm−1 region andaround 1640 cm−1 was observed upon immersion in 3.5% NaCl solution.These bands are respectively related to the stretching, (OH)and in plane bending, ı(OH) of water molecules. Up to a 15% differencein maximum absorbance was observed for two differentpieces of the same wet material. Consequently, no quantitativeanalysis of the water diffusion was performed. Nevertheless, theresults in Fig. 7 demonstrate a clear effect of PANI content andnature of dopant on sorption. It can be seen that PANI–LS1 andPANI–BS have a negative effect on the sorption properties. Theamount of water absorbed increases with the amount of theseadditives. On the contrary, PANI–LS2 additives seems to have a positiveeffect on the sorption properties as indicated by the loweramount of absorbed water than all other systems. It is temptingto draw a parallel between the conductivity of PANI–LSs andtheir effect on sorption process, namely a low conductivity of thePANI–LS is beneficial to the water absorption properties of thecoating.
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