Synthesis and Characterization of the Octaaminopropyl-Silsesquioxane

synthesis octaaminopropyl

Absract  Octaaminopropylsilsesquioxane (OAPS) was synthesized with alkali-equilibrated mixtures of g-aminopropyltriethoxysilane and quaternary ammonium hydrate. The molecular mass and distribution were determined by GPC and VPO. Element contents were obtained from Element analysis. The structure was characterized using FTIR, 1H NMR, 13C NMR, 29Si NMR. The thermal stability was measured by means of DSC. Melting point was observed with microscopic …

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Kinetics and mechanism of the oxidation of oxalic acid by potassium yetrabromoaurate(III)

Abstract The oxidation of oxalic acid by the potassium tetrabromoaurate(III) in 0.005≤ [H2C2O4]≤0.07 mol dm-3 is studied by UV spectrophotometry in the temperature range of 293.2 – 313.2 K. Under pseudo-first-order conditions ([H2C2O4]0 ≥10[Au(III)]0), it is first order in [Au(III)] and [H2C2O4]. Both H+and Br– retard the reaction. The reactive species for Au(III) is AuBr3(H2O). A mechanism for this reaction …

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Kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol by cerium(IV) in acid medium

Abstract The kinetics and mechanism of ruthenium(III) catalyzed oxidation of isobutyl alcohol(IBA) by cerium(IV) in sulfuric acid media has been investigated by titrimetric technique of redox in the temperature range of 298-313K. It is found that the reaction is first-order with respect to Ce(IV) and Ru(III), and a positive fractional order with respect to IBA. It …

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Pinacolization of Aromatic Aldehydes using Zn

zn

Zang Hongjun, Li Jitai#, Bian Yanjiang#, Li Tongshuang# (Research Institute of Elemento-organic Chemistry, Key Labortary of Elemento-organic Chemistry, Nankai University, Tianjin.300071; #College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China) Received Sep.28, 2002. The project was supported by NSFC (29872011), Educational Ministry of China and Educational Department of Hebei Province; Natural Science Foundation of Hebei …

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Cure Kinetics of Epoxy Resin/MP/Anhydride/Accelerant Flame Retardant Composite

Abstract Cure kinetics of epoxy resin E51/MP/methyltetrahydrophthalic anhydride (MeTHPA)/ 2-ethyl-4-methyl-imidazole (2,4-EMI) flame retardant composite were studied using the dynamical tortional vibration method. The influence of MP loadings on The cure showed has improved studied were well. The results showed that the rate of cure reactions depended distinctly on the cure temperature. At low MP loadings, the …

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