SYNTHESIS AND APPLICATION OF POLYANILINE SUBSTITUTED AZO-DYES AND THE STUDY OF THEIR ANTIMICROBIAL ACTIVITY AND ELECTRICAL CONDUCTIVITY ON POLYESTER AND NYLON 6, 6 FABRIC
SYNTHESIS AND APPLICATION OF POLYANILINE SUBSTITUTED AZO-DYES AND THE STUDY OF THEIR ANTIMICROBIAL ACTIVITY AND ELECTRICAL CONDUCTIVITY ON POLYESTER AND NYLON 6, 6 FABRIC
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Date
2017-07
Authors
JOSHUA, OBADAHUN
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Abstract
Polyaniline substituted azo dyes were synthesized from polyaniline obtained by oxidative
polymerization of aniline and different azo dyes obtained from 2-aminothiophene intermediates.
Four different polyaniline substituted dyes were synthesized and there melting points were found
to be from 286°C- 319°C and spectroscopic assessment such as Visible spectroscopy, Fourier
Transform-Infra Red (FT-IR) spectroscopy and Gas chromatography-mass spectroscopy (GCMS)
were carried out to elucidate the structures of the synthesized polyaniline substituted azo
dyes. The maximum absorption wavelenght (ʎmax) of the polyaniline substituted azo dyes
ranges from 518-587nm in DMSO and 511-553nm in acetone. The FT-IR spectra of the
polyaniline substituted azo dyes showed absorption peaks in the range 3213.0- 3242.8cm-1 due to the presence of an amino group. The benzenoid and quinoid rings for all the polyaniline
substituted azo dyes appeared in the range 1461-1487cm-1 and 1543-1595cm-1 respectively while the carbon nitrogen single bond (C-N) absorption were found in the range 1263.6-1285cm-1. For the assessment of the antimicrobial properties of the synthesized dyes, different
microorganisms such as Staphylococcus aureus, Salmonella typhi, Bacillus subtilis, Escherichia coli, Candida albican, Aspergillus niger were selected based on their pharmacological incidence and Agar well diffusion method was used. The result of the antimicrobial studies showed zones of inhibition ranging from 14-34mm. The strong activity of the synthesized polyaniline substituted azo dyes against Staphylococcus aureus, Salmonella typhi, Escherichia coli and Candida albican showed that it may be effective against infectious diseases which these microorganisms causes. The MIC and MBC/MBF value of 12.5mg/ml of the synthesized polyaniline substituted Dye A had activities against Staphylococcus aureus and Escherichia coli. The electrical conductivity measurement were obtained by employing a standard process of using a programmable inductance capacitor resistance (LCR) meter. The electrical conductivity value of polyaniline substituted azo dyes was found to be in the range of 10-2 – 10-4 S .m-1 and moreso, the dyes synthesized from the 2-aminothiophene and sulphanilic acid were successfully applied to polyester and nylon 6,6 fabric and the light and washing fastness properties were evaluated. The dyes gave mostly purple, deep pink, deep purple and yellow shades on the fabric and exhibited good to excellent wash fastness and moderate to very good light fastness properties on the substrates.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILLMENT OF THE
REQUIREMENTS FOR THE AWARD OF MASTER OF SCIENCE (M.Sc.) IN
COLOUR CHEMISTRY AND TECHNOLOGY DEPARTMENT OF POLYMER AND TEXTILE SCIENCE, AHMADU BELLO UNIVERSITY, ZARIA, NIGERIA
Keywords
SYNTHESIS,, APPLICATION,, POLYANILINE,, AZO-DYES,, ANTIMICROBIAL,, ELECTRICAL CONDUCTIVITY,, POLYESTER,, NYLON 6, 6 FABRIC,