Author
K. Audisesha Reddy
Bio: K. Audisesha Reddy is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Solubility & Fluorene. The author has an hindex of 1, co-authored 1 publications receiving 3 citations.
Topics: Solubility, Fluorene, Phthalide, Thianthrene, Phenoxathiin
Papers
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TL;DR: In this paper, several new aromatic-aliphatic cardopolyamides containing phenoxathiin and thianthrene derivatives were prepared by the direct polycondensation of 2,8-phenoxathyin-bis(γ-ketobutyric acid) (PA) or 2,7-thian-threne-bis (γ-ketabolitioned) (TA) with 3,3-bis-4-aminophenyl phthalide (PDA), 9,9-bis-(4-amino-phthalide)
Abstract: Several new aromatic-aliphatic cardopolyamides containing phenoxathiin and thianthrene derivatives were prepared by the direct polycondensation of 2,8-phenoxathiin-bis(γ-ketobutyric acid) (PA) or 2,7-thianthrene-bis(γ-ketobutyric acid) (TA) with 3,3-bis(4-aminophenyl phthalide) (PDA), 9,9-bis(4-aminophenyl fluorene (FDA), or 9,9-bis(4-aminophenyl) anthrone (ADA) in a triphenyl phosphite-pyridine system. The cardopolyamides were obtained in 80–95% yield and possessed viscosities in the range 0.90-1.35 dl/g. They showed better solubility and heat resistance than analogous noncardopolyamides derived from conventional diamines. All the polymers were characterised by IR spectra, density, solubility, crystallinity and thermal analysis. Integral procedural decomposition temperatures (IPDT) were calculated from the primary thermograms in the temperature range 100–650°C to give quantitative data regarding the thermal stabilities. The molecular weight and molecular weight distribution of the polyamides were determined by gel-permeation chromatography (GPC).
3 citations
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TL;DR: The characteristic features of the synthesis and properties of cardo polyheteroarylenes (polyarylates, aromatic polyethers, polyamides, polyimides and polyoxadiazoles) are examined and surveyed in this paper.
Abstract: The characteristic features of the synthesis and properties of cardo polyheteroarylenes (polyarylates, aromatic polyethers, polyamides, polyimides, polyoxadiazoles, and others) are examined and surveyed. It is shown that cardo polymers containing bulky side-groups, linked via cyclic groups to the polymer main chain, have enhanced thermal characteristics combined with a satisfactory solubility. Certain aspects of the practical applications of polymers of this kind are considered. The bibliography includes 309 references.
52 citations
TL;DR: In this article, a novel polyamide, i.e., poly(thiazoleterephthalamide), was synthesized by polycondensation of 2,5-diaminothiazole (DAT) with terephthalic acid (TPA) in N -methyl-2-pyrrolidone (NMP) as solvent at 225-230°C under nitrogen atmosphere.
18 citations
TL;DR: In this article, the synthesis and characterization of polyesters comprising 4,4′-dihydroxy bischalcone as main chain moiety was reported and the polymers were characterized by IR and elemental analysis.
Abstract: Synthesis and characterization of polyesters comprising 4,4′-dihydroxy bischalcone as main chain moiety is reported here. Polyester chalcones were obtained by condensation of 4,4′-dihydroxy chalcones with adipic and terepthalic acid respectively. The polymers were characterized by IR and elemental analysis. The thermal and electrical behaviour were studied by TGA, DSC, and conductivity techniques respectively. The polymers were found to behave like semi-conductors and were thermally stable.
1 citations