Venkatanarayana Mahadevan

IIT Madras is a public technical and research university located in Chennai, Tamil Nadu. Founded in 1959, it is recognised as an Institute of National Importance.

IIT Madras has been ranked as the top engineering institute in India for four years in a row by the National Institutional Ranking Framework of the MHRD

It currently offers undergraduate, postgraduate and research degrees across 16 disciplines in Engineering, Sciences, Humanities and Management. About 596 faculty belonging to science and engineering departments and centres of the Institute are engaged in teaching, research and industrial consultancy.

IIT Madras

Preparation and properties of polybenzimidazoles containing dibenzothiophenediyl or 5,5-dioxodibenzothiophenediyl units

Polymer

Novel polyamides containing 2,3,6,7-dibenzo-l-thia-4,5-diazacyclohepta-2,4,6-triene-4′,4″-dicarboxy-1,1-dioxide (VII) are reported. The acid VII was prepared in several steps from p-chlorobenzoic acid and characterized by spectral data and elemental analysis. Prior to polymer synthesis, a model diamide (MDA) was prepared from VII and p-toluidine. The model diamide and several polyamides were obtained in an overall yield of (75-90%) by direct polycondensation of acid VII with certain diamines through a phosphorylation reaction at 100-110°C employing a solvent mixture of NMP-pyridine. The resulting polyamides and MDA were characterized by spectral, analytical, and thermal methods. The solubility, density, viscosity, and morphology (X-ray) were also studied for the polyamides. These polymers were moderately soluble in conventional polymer solvents, and the inherent viscosities were measured in concentrated sulfuric acid. Integral procedural decomposition temperatures (ipdt) were calculated from their primary thermogram in the temperature range 100-650°C in order to have quantitative data regarding their relative thermal stabilities. The polymers exhibit a 10% weight loss at 500°C in static air. © 1990, Taylor & Francis Group, LLC. All rights reserved.

Journal of Macromolecular Science: Part A - Chemistry

Synthesis and characterization of heat-resistant polyamides from thiadiazacycloheptatriene dicarboxylic acid

Journal of Polymer Science: Macromolecular Reviews

Stability of high-temperature polymers

Journal of Polymer Science: Polymer Chemistry Edition

Preparation and properties of polyamides and polyimides containing phenoxathiin units

The Journal of Organic Chemistry

Isomeric products in the diacetylation of dibenzothiophene

Journal	Polymer
ISSN	00323861
Open Access	No