Author
L. Ravi Kumar
Bio: L. Ravi Kumar is an academic researcher. The author has contributed to research in topics: Conductive polymer & Polyaniline. The author has an hindex of 1, co-authored 1 publications receiving 13 citations.
Papers
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TL;DR: In this paper, Fourier Transform Infra-Red (FT-IR) and thermo gravimetric analysis (TGA) were used to determine the electrical conductivities of PANI in the temperature range 32°C to 80°C.
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%.
13 citations
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TL;DR: In this article, a dihydroxy monomer N-(4-hydroxy-3methoxybenzal) N′-(4′-hydroxyphenyl)thiourea was condensed with six diacid chlorides.
38 citations
TL;DR: 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 as mentioned in this paper.
32 citations
27 Feb 2014
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).
19 citations
TL;DR: In this paper, two new poly esters were synthesized by direct polycondensation of 4′-hydroxybenzalaniline-4-carboxylic acid (4-CARB) using dichlorophenylphosphine at 140°C in DMF solvent containing LiCl.
16 citations
TL;DR: In this article, 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).
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...
16 citations