Purification and glutaraldehyde activation study on HCl-Doped PVA–PANI copolymers with different aniline concentrations
Resumen
In this work, we report the synthesis and purification of polyvinyl alcohol-polyaniline
(PVA–PANI) copolymers at different aniline concentrations, and their molecular (1H-NMR and
FTIR), thermal (TGA/DTG/DSC), optical (UV–Vis-NIR), and microstructural (XRD and SEM)
properties before and after activation with glutaraldehyde (GA) in order to obtain an active membrane.
The PVA–PANI copolymers were synthesized by chemical oxidation of aniline using ammonium
persulfate (APS) in an acidified (HCl) polyvinyl alcohol matrix. The obtained copolymers were
purified by dialysis and the precipitation–redispersion method in order to eliminate undesired
products and compare changes due to purification. PVA–PANI products were analyzed as gels,
colloidal dispersions, and thin films. 1H-NMR confirmed the molecular structure of PVA–PANI
as the proposed skeletal formula, and FTIR of the obtained purified gels showed the characteristic
functional groups of PVA gels with PANI nanoparticles. After exposing the material to a GA solution,
the presence of the FTIR absorption bands at 1595 cm��1, 1650 cm��1, and 1717 cm��1 confirmed
the activation of the material. FTIR and UV–Vis-NIR characterization showed an increase of the
benzenoid section of PANI with GA exposure, which can be interpreted as a reduction of the polymer
with the time of activation and concentration of the solution.
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