Immanuel Selvaraj - Academia.edu (original) (raw)
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National Institute of Technology Rourkela
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Papers by Immanuel Selvaraj
Journal of Fluorine Chemistry, 2001
Octachlorocyclotetraphosphazene was treated with various¯uorinated phenols to form partially and ... more Octachlorocyclotetraphosphazene was treated with various¯uorinated phenols to form partially and completely substituted cyclotetraphosphazenes. The mono-substitution reactions were carried out using a base in benzene while for complete substitution sodium salts of the corresponding phenoxides were used. All compounds were characterized by 1 H, 19 F, and 31 P NMR, IR and mass spectroscopic methods. A crystal structure was obtained for N 4 P 4 (OC 6 F 5) 8 , and shows that the phosphazene ring is puckered. The angle of the planes N2P2N1P1N4 to N4P4N3P3N2 is 45.58 and the angle of the planes N1P1N4P4N3 to N3P3N2P2N1 is 43.88.
Polymer International, 1998
ABSTRACT
Polymer, 1995
Poly (methoxy ethoxy ethyl methacrylate) (poly(MEEMA)), an acrylate polymer containing a short ol... more Poly (methoxy ethoxy ethyl methacrylate) (poly(MEEMA)), an acrylate polymer containing a short oligo oxyethylene side chain, readily dissolves alkali metal salts. Ionic conductivity studies on poly(MEEMA) LiCF3SO3 complexes at different compositions and temperatures have been carried out. The highest conductivity observed for the poly(MEEMA)LiCF3SO3 (O:Li, 20:1) complex is 2.98 × 10−5 S cm−1 at 298 K. I.r. SEM and XRD
Polymer, 1999
ABSTRACT 4-Trimethylsilyloxy-4′-vinylbiphenyl was treated with perfluorobenzene, substituted poly... more ABSTRACT 4-Trimethylsilyloxy-4′-vinylbiphenyl was treated with perfluorobenzene, substituted polyfluorobenzenes, and perfluoronaphthalene to give 4-[(per/polyfluoro)phenyloxy]-4′-vinylbiphenyls in the presence of catalytic amounts of CsF. The new monomers that resulted were characterized by mass spectra, 1H and 19F NMR, and IR spectroscopy. The new polymers obtained by polymerizing the monomers using AIBN-initiated free radical polymerization were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), 1H and 19F NMR and IR spectroscopies. The polymers were obtained as white powders and were soluble in all common organic solvents. They are thermally very stable and have high glass transition temperatures, Tg, i.e. >100°C. Copolymerization of one of the monomers, 4-pentafluorophenyloxy-4′-vinylbiphenyl, 3, with different molar ratios of methylacrylate gave copolymers that have low glass transition temperatures compared with the homopolymer of the monomer, 3, along with very high thermal decomposition temperatures, e.g. incorporation of even a small amount (2.1%) of 3 into the methylacrylate copolymer gave rise to a 50% char yield at 410°C and a glass transition temperature of 28°C.
Journal of Polymer Science Part A: Polymer Chemistry, 1993
Journal of Fluorine Chemistry, 2001
Octachlorocyclotetraphosphazene was treated with various¯uorinated phenols to form partially and ... more Octachlorocyclotetraphosphazene was treated with various¯uorinated phenols to form partially and completely substituted cyclotetraphosphazenes. The mono-substitution reactions were carried out using a base in benzene while for complete substitution sodium salts of the corresponding phenoxides were used. All compounds were characterized by 1 H, 19 F, and 31 P NMR, IR and mass spectroscopic methods. A crystal structure was obtained for N 4 P 4 (OC 6 F 5) 8 , and shows that the phosphazene ring is puckered. The angle of the planes N2P2N1P1N4 to N4P4N3P3N2 is 45.58 and the angle of the planes N1P1N4P4N3 to N3P3N2P2N1 is 43.88.
Polymer International, 1998
ABSTRACT
Polymer, 1995
Poly (methoxy ethoxy ethyl methacrylate) (poly(MEEMA)), an acrylate polymer containing a short ol... more Poly (methoxy ethoxy ethyl methacrylate) (poly(MEEMA)), an acrylate polymer containing a short oligo oxyethylene side chain, readily dissolves alkali metal salts. Ionic conductivity studies on poly(MEEMA) LiCF3SO3 complexes at different compositions and temperatures have been carried out. The highest conductivity observed for the poly(MEEMA)LiCF3SO3 (O:Li, 20:1) complex is 2.98 × 10−5 S cm−1 at 298 K. I.r. SEM and XRD
Polymer, 1999
ABSTRACT 4-Trimethylsilyloxy-4′-vinylbiphenyl was treated with perfluorobenzene, substituted poly... more ABSTRACT 4-Trimethylsilyloxy-4′-vinylbiphenyl was treated with perfluorobenzene, substituted polyfluorobenzenes, and perfluoronaphthalene to give 4-[(per/polyfluoro)phenyloxy]-4′-vinylbiphenyls in the presence of catalytic amounts of CsF. The new monomers that resulted were characterized by mass spectra, 1H and 19F NMR, and IR spectroscopy. The new polymers obtained by polymerizing the monomers using AIBN-initiated free radical polymerization were characterized by gel permeation chromatography (GPC), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), 1H and 19F NMR and IR spectroscopies. The polymers were obtained as white powders and were soluble in all common organic solvents. They are thermally very stable and have high glass transition temperatures, Tg, i.e. >100°C. Copolymerization of one of the monomers, 4-pentafluorophenyloxy-4′-vinylbiphenyl, 3, with different molar ratios of methylacrylate gave copolymers that have low glass transition temperatures compared with the homopolymer of the monomer, 3, along with very high thermal decomposition temperatures, e.g. incorporation of even a small amount (2.1%) of 3 into the methylacrylate copolymer gave rise to a 50% char yield at 410°C and a glass transition temperature of 28°C.
Journal of Polymer Science Part A: Polymer Chemistry, 1993