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Abstract

The phase behavior of Poly Ethylene Glycol (PEG) with Methyl Methacrylate and 2-Ethoxy Ethylmethacrylate (MMA/EOEMA) copolymer was investigated using viscometric, FT-IR, DSC thermal analysis and surface morphology studies. The studies were carried out at various blend compositions with chloroform as common solvent. From the viscosity data based on sign convention involved in the criterion, the values of μ and α for PEG with copolymer blends system was computed and found to be partially positive indicating it is partially phase separation for all blends composition. The phase separations of the blends were also supported by DSC thermal analysis method. The properties of specific, intermolecular and hydrogen bonding interactions of PEG with copolymer blends are studied by spectroscopic techniques such as FT-IR and the obtained results were further confirmed by surface morphology studies. The phase separation behaviour of the copolymers with PEG blend is clearly visible from the Scanning Electron Microscopy patterns. 

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Abstract

The kinetic studies on oxidation of Ethyl-2-(methylthio) pyrimidine 5-carboxylate by potassium dichromate in aqueous perchloric acid medium was studied at 26 ± 0.1^oC. The reaction shows first order dependence in both Ethyl-2-(methylthio) pyrimidine 5-carboxylate and potassium dichromate which supports the derived rate law and fractional order dependence in perchloric acid. The effect of temperature on the rate of reaction has also been studied and the activation parameters have been evaluated. The reaction constants involved in the mechanism were computed. The stoichiometry of the reaction was found to be 3:2 and the oxidation products were identified as 2-methyl sulfanyl-pyrimidine-5-carboxylic acid and acetaldehyde.

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