S.B. Halligudi

National Chemical Laboratory

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Ankur Bordoloi

Indian Institute of Petroleum

M.M.Taqui Khán

Carnegie Council for Ethics in International Affairs

Ajayan Vinu

University of Newcastle Australia

Ganapati V. Shanbhag

Poornaprajna Institute of Scientific Research

F. Lefebvre

École d'Ingénieurs en Chimie et Sciences du Numérique

Biju M. Devassy

National Chemical Laboratory

Trissa Joseph

Nnamdi Azikiwe University

Dhanashri P. Sawant

National Chemical Laboratory

Suman Sahoo

National Chemical Laboratory

Sumita Shukla

Narayan Medical College and Hospital

Cooperative Institutions

National Chemical Laboratory

Korea Research Institute of Chemical Technology

Central Salt and Marine Chemicals Research Institute

Council of Scientific and Industrial Research

Academy of Scientific and Innovative Research

Karnatak University

National Institute for Materials Science

Savitribai Phule Pune University

Bhavnagar University

Korea University of Science and Technology

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Synthesis, characterization, and molecular modeling studies of novel polyurethanes based on 2,2′‐[ethane‐1,2‐diylbis(nitrilomethylylidene)]diphenol and 2,2′‐[hexane‐1,6‐diylbis(nitrilomethylylidene)] diphenol hard segments

Journal of Polymer Science Part A Polymer Chemistry (2006)

Anjanapura V. Raghu Guru S. Gadaginamath Sheetal S. Jawalkar S.B. Halligudi Tejraj M. Aminabhavi

Abstract Novel polyurethanes (PUs) based on 2,2′‐[ethane‐1,2‐diylbis(nitrilomethylylidene)]diphenol and 2,2′‐[hexane‐1,6‐diylbis(nitrilomethylylidene)]diphenol as hard segments containing four aromatic diisocyanates (4,4′‐diphenylmethane diisocyanate, toluene 2,4‐diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate) have been prepared. Fourier transform infrared, UV spectrophotometry, fluorescence spectroscopy, 1 H NMR and 13 C NMR spectroscopy, thermogravimetric analysis, and differential thermal analysis have been used to determine the structural characterization and thermal properties of the segmented PUs. All the PUs contain domains of both semicrystalline and amorphous structures, as indicated by X‐ray diffraction. The acoustic properties have been calculated with the group contribution method. Molecular dynamics simulations have been performed on all the PUs to estimate the cohesive energy density and solubility parameter values, which compare well with the values calculated with the group contribution method. Furthermore, the simulation protocols have been applied to the PUs to produce X‐ray diffraction plots to determine the phase morphology of the PUs. The surface properties of the PUs have been estimated from the simulation protocols. © 2006 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 6032–6046, 2006

Isophorone diisocyanate

Hexamethylene diisocyanate

Thermogravimetric analysis

10.1002/pola.21686

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Citations (53)

Ultrafiltration membranes for the separation of catalyst and products in homogeneous catalysis systems

Journal of Chemical Technology & Biotechnology (1992)

S.B. Halligudi M.M.Taqui Khán N.V. Desai R. Rangarajan A.V. Rao

Abstract Results of preliminary studies on concentration by ultrafiltration and reuse of a Ru(III)EDTA complex in homogeneous catalysis are reported. A method of preparation and selection of conditions of making cellulose acetate membranes for concentrating Ru(III)EDTA is described. At an operating pressure of 75 psig (517 kPa), the above catalyst can be concentrated to seven to eight times its initial concentration. The membrane used exhibits a separation of about 97.5 % for the complex with a permeate flow rate of about 3–6 gallons per sq. ft per day. The catalyst activities were determined for two reactions, viz. hydroformylation of 1‐hexene and carbonylation of ammonia for five cycles of concentration followed by reuse. The experimental data indicated that the catalyst concentration by ultrafiltration for subsequent reuse is simple and attractive and can provide potentially energy saving alternative to the cumbersome conventional separation processes associated with the recovery of catalysts in homogeneous catalysis.

Ultrafiltration (renal)

Cellulose acetate

Homogeneous Catalysis

10.1002/jctb.280550402

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Citations (7)

A comparative study on liquid phase alkylation of 2-methylnaphthalene with long chain olefins using different solid acid catalysts

Applied Catalysis A General (2008)

Nishita Lucas Ankur Bordoloi Amol P. Amrute Palraj Kasinathan Ajayan Vinu

Acid strength

10.1016/j.apcata.2008.09.032

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Citations (46)

Miscibility of chitosan–hydroxyethylcellulose blends in aqueous acetic acid solutions at 35°C

Journal of Applied Polymer Science (2005)

Ashwini Wali B. Vijaya Kumar Naidu Mallikarjuna N. Nadagouda S. R. Sainkar S.B. Halligudi

Abstract The miscibility of blends of chitosan and hydroxyethylcellulose in a 2% acetic acid solution was studied by viscometry, densitometry, and refractometry at 35°C. The data suggest that the blends were completely miscible in all proportions. Further, the membranes were fabricated from concentrated blend solutions. The solid‐state compatibility of the blends was confirmed by scanning electron microscopy. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 1996–1998, 2005

Miscibility

Refractometry

10.1002/app.21421

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Citations (9)

Hydroformylation of allyl alcohol catalyzed by water-soluble Ru(III)-EDTA complex

Journal of Molecular Catalysis (1988)

M.M.Taqui Khán S.B. Halligudi Sayed H. R. Abdi

Allyl alcohol

Autoclave

Primary alcohol

10.1016/0304-5102(88)80011-7