Advanced Materials Research Vols. 233-235

Abstract: CaZn₂(PO₄)₂ and β-BaB₂O₄ nanopowders were firstly synthesized by an ultrasonic-aid chemical precipitation method. Then BaB₂O₄ was mixed with CaZn₂(PO₄)₂ to prepare CaZn₂(PO₄)₂-BaB₂O₄ nanopowder ecological anticorrosive pigment. The TG-DTA, XRD and TEM measurements were used to characterize the structure and morphology of products. The activation of pigment has been improved by two ways: one is the synthesis of well-dispersed nanometer-sized powder with narrow distribution; the other way is to mix the two kinds of pigment together to generate a hybrid ecological pigment. Finally, the anticorrosive experiments of the product were investigated in aqueous alkyd paints. The result of anticorrosive performance indicates that the as-obtained hybrid pigments exhibit more excellent properties than commercial zinc phosphate and ZPA from Germany.

Abstract: Multiphase, segmented polyurethanes with mixed soft segment phase were prepared from 4,4’- diphenylmethane diisocyanate (Pure MDI), polybutylene adipate (glycol) 2000 (PBA2000) and polyethylene glycol 1000 (PEG1000) with 1,4-butanediol (BDO) as the chain extender. Further more, the relationships between domain separation structure, crystallizability of soft segment and moisture permeability, hydrophilic property, phase inversion temperature (PIT) of the polyurethanes were investigated. The studies show that the chemical structure, concentration of hydrophilic soft monomers and the microphase separation degree of the mixed soft segments from hard segment domain have remarkable effects on the application properties of polyurethane.

Abstract: Studied the craft of synthesize 2-ChloroNicotinicacid, which was 3-Dimethylamino -acrolein and Eethylcyanoacetate as raw materials, synthesized 2,4-pentadienoicacid-2-cyano-5- dimethylaminoethylester, then used HCl gas to cyclize it, the product Ethyl 2-chloronicotinate was hydrolyzed to get 2-chloronicotinicacid. The effects of solvent and catalyst were discussed. The results showed that 2,4- pentadienoi cacid – 2-cyano-5-(dimethylamino) ethyl ester can be dissolved in dimethylethane at low temperature, so that it avoided the own polymerization when cyclization synthesis Ethyl 2-chloronicotinate. The yield was 91.84%. The craft was simple and had less steps and higher yield; there is the potential for industrialization

Abstract: The silicone succinate surfactant (PMPS) was synthesized by ring-opening reaction using polyether alcohol amine modified polysilosane (PAPS) with maleic anhydride (MA) as the raw materials, and p-toluenesulfonic acid (PTSA) was used as the catalyst. Sulfated castor oil and sulfated rapeseed oil were combinated with PMPS to prepare a new leather fatliqour (PMPSF) composed mainly of PMPS. The molecular structure of PMPS was characterized by FTIR spectra; the thermal properties of PMPS was characterized and analyzed by TGA. PMPSF was used in sheepskin wet blue leather and compared with oxidative sulfited vegetable oils (L-3) and RF-1 fatliquor; the waterproof and mechanical properties of the leather were measured. The results show that the thermal decomposition temperature of PMPS is 192.8°C. Fatliquor PMPSF provids a good level-dyeing property, the leather oiled by it has good flexibility and fullness, the waterproofness and mechanical properties of leather are also good. Moreover, compared with the leather fatliquored by L-3, the thickening rate of leather oiled by PMPSF reaches 13.7%.

Abstract: Oil component and molecule structures is studied by application of gas chromatogram, infrared spectrum and nuclear magnetic resonance to develop high efficiency and cost effective surfactant used for chemical flooding, HZS surfactant has been developed on basis of relationship between effectiveness and structure of the surfactant. Study on surfactant structure characterization and performance evaluation suggests that oil/water interfacial tension is super low when distribution of carbon number of main component of surfactant is identical to the distribution of main component of oil, and concentration impairment due to surfactant retention on surface of core. Reference can be provided to reservoir selection and surfactant development of other oilfield.

Abstract: Direct electroless nickel plating on n-Si(100) wafers in alkaline solutions was performed without any activation procedure in advance. The effect of pH and temperature on the size of deposited metal particles was examined. Moreover, The phosphorus contents of deposits were also analyzed by the energy disperse spectroscopy. The results indicated that the optimal reaction temperature was 60°C and the optimal pH value was 10.0 with a plating rate of about 3.0 µm/hr and the phosphorus content of about 3.6 wt%.

Abstract: Granular carboxymethyl starch (CMS) with high degree of substitution (DS) was synthesized using a modified dry process. The carboxymethylation reaction was carried out with granular potato starch, solid NaOH and sodium monochloroacetate (SMCA). The effects of reaction temperature, reaction time, molar ratio of NaOH and SMCA to starch on the degree of substitution (DS) and the reaction efficiency (RE) of CMS were investigated. High DS up to 0.78 was obtained for reaction at 323 K for 6 h with molar ratio of NaOH and SMCA to starch being 2:2:1. CMS was characterized by Fourier transform infrared spectrophotometer and scanning electron microscopy.

Abstract: In this paper, photometric analysis reagents of rare earths and their application in metallurgical analysis at home and abroad in the past 10 years was reviewed, pertaining especially to various coloring reagents of rare earths and its conditions of coloring reaction, the maximum absorption wavelength, molar absorptivity coefficient, limit of detaction, as well as interference and application of corresponding methods. The key application in the determination of actual samples was summarized for it is very important to eliminate the effect of interfering ions. The purpose is to provide help to establish new analysis methods of high sensitivity and selectivity in the future. 52 references are cited.

Abstract: p-Nitrobenzoic acid could be efficiently prepared from aerobic oxidation of p-nitrotoluene using manganese dioxide (MnO₂) and N-hydroxyphthalimide (NHPI) as catalysts. The conditions of oxidation were also optimaized: 97 % conversion of p-nitrotoluene and 89 % isolated yield of p-nitrobenzoic acid could be obtained at 110 °C under 0.4 MPa for 4 h in presence of 10 mol% NHPI and 10 mol% MnO₂.

Abstract: The important pyrimidine intermediate 2-chloro-4,6-diamino-5-cyanopyrimidine was prepared by the cyclization of sodium salt of 1-amino-1-cyanamino-2,2-dicyanoethylene which was obtained from sodium dicyanamide and malononitrile via the nucleophilic addition in good yield and purity. The 4,6-diamino-5-cyanopyrimidines substituted with different amino groups could be synthesized by nucleophilic substitution reaction of amines, and they have good bactericidal activities to some funguses.