Division of Chemical Sciences: Recent submissions
Now showing items 461-480 of 1541
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Studies on the degradative behaviour of polymers containing weak-links of group VI A elements
Unavoidable interaction of aerial oxygen during free-radical polymerization of vinyl monomers results in the formation of weak peroxy linkages in the backbone which dramatically affect the stability of polymers, even though ... -
Studies on the role of vinyl polyperoxides as initiators and polymeric DI and tetrasulfides as chain transfer agents
Terpolyperoxides of styrene, MMA and ?-methylstyrene were synthesized by polymerizing these monomers under excess oxygen pressure by varying the initial feed. The TPPEs have been characterized and it has been shown that ... -
Dharwar stratigraphy and gold mineralisation in Kolar supracrustal belt Karnataka craton India.
The Karnataka Craton is composed of four chief crustal components, viz., the Peninsular Gneiss Complex (PGC), the Sargur Supercrustals, the Dharwar Supercrustals, and the younger granites. The craton is roughly divided ... -
Mechanism of electroreduction of nitrobenzene in alkaline media
Nitrobenzene is shown to give a stepwise reduction in certain media. With a view to examine the factors which influence the scheme of reduction, the effect of different solvents and ionic strengths are examined using tast ... -
Geology Geochemistery and Mineralogy of Mafic-Ultramafic, Gneissic and cordierite Gneiss Enclaves of the south- eastern sector karnataka craton.
This study attempts to decipher the relationships that may exist among the major crustal components in the Eastern Block of Karnataka Craton. Field traverses were undertaken to study the little-known enclaves of (a) ... -
Methyl Methacrylate Styrene
Polymeric peroxides are mainly a class of 1:1 copolymers of vinyl monomers and oxygen. The study of the formation of these polymers has been instrumental in explaining the inhibitory role of oxygen in vinyl polymerization. ... -
Triphenylphosphazenyl-cyclotriphosphazenes and bicycle phosphazenes
The work presented in this thesis consists of two parts. The first part deals with the preparation of (triphenylphosphazenyl)pentachlorocyclotriphosphazene, N?P?Cl?(NPPh?) and its reactions with primary and secondary amines. ... -
Thermal studies on polymers and propellants
This limited pyrolysis study of three commercial carboxy-terminated polybutadienes used in present-day propellant industry was conducted to gain some information on their kinetics and mechanism of decomposition in inert ... -
Physico-chemical studies on Deoxyoligoyuanlic acids and their complexes with Polyribocytidylic acids
Venom and spleen exonuclease are capable of cleaving guanosine oligonucleotides when they are not aggregated. At 22°C, in presence of sodium ions aggregation is rapid even at 0.5 × 10?? M concentration. On the other hand, ... -
Study of vibrational spectra and donacity of some sulphur-nitrogen compounds containing; thiocarbonyl grouping
The infrared and Raman spectra of 1,3,4,6-tetrahydropyrimidine-2-thione (tpt) and -2-one (tpo) are studied. The infrared spectra of oriented polycrystalline samples of tpt and imidazolidine-2-thione (ethylenethiourea, etu) ...