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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Effects of cation-anion on recognition characteristics of sarafloxacin -Co(II) complex imprinted polymer in aqueous media

In this paper, a molecularly imprinted polymers (MIP) for sarafloxacin was prepared by the use of itaconic acid as the functional monomer and ethylene glycol dimethacrylate as the crosslinking monomer. To improve selectivity, cobalt(II) ions was used to form metal-template complex, which provided the specific binding sites similar to metal-chelate antibody. The influences of different …

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Preparation and characterization of high molecular weight poly(L-lactic acid) by chain extending

Abstract Poly(L-lactic acid) (PLLA) of high molecular weight was prepared by chain extending reaction in a micro-compounder. Phosphites were used as chain extenders to increase the molecular weight of the PLLA prepolymer that was prepared by bulk polycondensation of L-lactic acid. Effects of the amount of the phosphite, temperature and the screw speed were studied on …

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Adsorption and competitive adsorption of heavy metal ions lead, cadmium and copper on d-manganese oxide

Abstracts d- MnO2 was prepared with hydrothermal treatment, and its crystalline structure was verified with X-ray diffraction spectroscopy. FTIR showed there were copious hydroxyl groups on the surface of d-MnO2 for the adsorption. The adsorption capacity of three kinds of heavy metal ions Pb2+, Cd2+ and Cu2+ on the d-MnO2 was all increased with the increase of ion concentration and the increase of …

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Pinacolization of Aromatic Aldehydes using 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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