K. Sethupathi

Bio: K. Sethupathi is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topic(s): Conductive polymer & Polyaniline. The author has an hindex of 1, co-authored 1 publication(s) receiving 13 citation(s).

Synthesis and Characterization of Conductive Blends of Polyaniline with Poly(azomethine ester)s

Abstract: Polyaniline (PANI) doped with HCl was blended with different poly(azomethine ester)s (10% by weight of PANI) and compressed into pellets. The blends were studied by Fourier Transform Infra-Red (FT-IR) and thermo gravimetric analysis (TGA). Electrical conductivities of the blends determined by four-point probe method, in the temperature range 32°C to 80°C, vary from 24.4 × 10−3 to 3.15 × 10−3 Scm−1. The TGA measurements show that weight loss occurred below 80°C is only about 2%.

Synthesis and characterization of new poly(azomethine ester)s having phenylthiourea units

Abstract: New polyesters having azomethine and phenylthiourea groups in the polymer backbone were synthesized by interfacial polycondensation method. The dihydroxy monomer N-(4-hydroxy-3-methoxybenzal) N′-(4′-hydroxyphenyl)thiourea was condensed with six diacid chlorides: terephthaloyl, isophthaloyl, azeloyl, suberoyl, pimeloyl and adipolyl chlorides. The resulting polyesters were characterized by viscosity, IR, NMR and TGA analysis. The wholly aromatic poly(azomethine ester) derived from terephthaloyl chloride when blended with polyaniline/NH4OH, polyaniline/HCl and pure polyaniline shows conductance in the range 3.2 × 10−3–0.91 × 10−1 S cm−1.

Novel processable and heat resistant poly(phenylthiourea azomethine imide)s: Synthesis and characterization

Abstract: N -(4-chloro-3-aminobenzal) N ′(4-aminophenyl)thiourea having phenylthiourea and azomethine groups was synthesized and exploited as starting material for the fabrication of new polymers. Novel diamine was condensed with pyromellitic dianhydride, 3,3′,4,4′-benzophenone-tetrcarboxylic dianhydride and 4,4′-(hexafluoroisopropylidene) diphthalic dianhydride to obtain poly(phenylthiourea azomethine imide)s. The structural explication of monomers and poly(phenylthiourea azomethine imide)s were carried out by FTIR, 1 H and 13 C NMR techniques along with crystallinity, organosolubility, inherent viscosity and molecular weight measurements. Accordingly, polymers bearing C S and –C N– moieties in the backbone demonstrated an amorphous nature and were readily soluble in amide solvents such as DMAc, DMF, and DMSO. Poly(phenylthiourea azomethine imide)s encompassed η inh of 1.40–1.55 dL/g and were obtained in quantitative yields. In addition, GPC measurements of polymers revealed M w around 60,291–67,665. Thermal stability of these polymers was ascertained via 10% weight loss temperatures around 514–533 °C in an inert atmosphere. Besides, glass transition temperatures of polyimides were found to be 272–276 °C.

Synthesis, Characterization and Metal Ion Adsorption Studies on Novel Aromatic Poly(Azomethine Amide)s Containing Thiourea Groups

Abstract: A series of novel ladder-type poly(azomethine amide)s (PAMs) were prepared from new azomethine containing carboxylic acid monomer (TCA) with simple aromatic diamines and aromatic diamines with thiourea groups (TDAs) by means of phosphorylation polycondensation reaction. Molecular weights of the polyamides were evaluated viscometrically, and the inherent viscosities were in the range of 0.31 - 0.58 g/dl. These ladder-type polymers were not freely soluble in common organic solvents. Structure of monomers and polymers were confirmed using FT-IR, 1H-NMR and 13C-NMR spectroscopic analysis. Removal of Cu2+ and Cd2+ from aqueous solutions by adsorption onto the polyamides was investigated. The effect of pH, initial metal ion concentrations and contact time were studied in batch experiments. The polyamides were found to be highly effective adsorbents for the removal of Cu2+ and Cd2+ metal ions from aqueous solutions. In a mixture of metal ions, the selectivity order was found to be Pb(II) > Cu(II) > Cr(IV) > Cd(II).

Synthesis, characterization and electrical conductivity of new poly (azomethine ester)s from hydroxy acids

Abstract: Two new poly (azomethine ester)s were synthesized by direct polycondensation of 4′-hydroxybenzalaniline-4-carboxylic acid (1) and 4′-hydroxy-3′-methoxybenzalaniline-4-carboxylic acid (2) using dichlorophenylphosphine at 140 °C in DMF solvent containing LiCl. Polymers were precipitated by pouring the reaction mixture into water. Monomers and polymers were characterized by viscosity, IR, 1H NMR and TGA. One of the poly (azomethine ester) derived from 4′-hydroxybenzalaniline-4-carboxylic acid (1) when blended with polyaniline/HCl, polyaniline/NH4OH and polyaniline shows conductance in the range 5.6 × 10−11 to 0.78 × 10−3 S cm−1.

Ferrocene-Based Aliphatic and Aromatic Poly(azomethine)esters: Synthesis, Physicochemical Studies, and Biological Evaluation

Abstract: In continuation to our efforts in finding potential therapeutic agents, a series of biologically significant poly(azomethine)esters (fe-PAME) were synthesized by the reaction of preformed (E)-4-((4-hydroxyphenylimino)methyl)phenol (SB) with 1,1-di(chlorocarboxyl)ferrocene, (PFe). Different aliphatic and aromatic sequences (1,3-propandiol, 1,6-hexandiol, and poly(dimethylsiloxane), hydroxyl-terminated (n = 550), 1,1,1,3,3,3-hexafluorobis(phenol)propane, and bisphenol A) were incorporated in the parent chain to study their effect on biological activity. The overall results led to the identification of some interesting polymers which seem to be potent antioxidants, highly cytotoxic, and more importantly DNA protecting and hence can be studied further for other pharmacological activities to be used as potential drug candidates. FTIR and 1H NMR spectroscopic studies and elemental analysis were used to establish structural elucidation and structure–property relations. Laser light scattering was used to determin...