Advanced Materials Research Vols. 887-888

Abstract: 4-[5-(2-Bromophenyl)-1,3,4-thiadiazol-2-ylthio]-2-(trifluoromethyl)thieno[2,3-d]pyrimidine was synthesized by a facile three-step procedure, including the cyclization of 2-aminothiophene-3-carbonitrile with trifluoroacetic acid, chlorination and nucleophilic substitution reaction. This protocol offers such advantages as mild reaction conditions, simple purification and good yields. The structure of the product was characterized by ¹H NMR, MS, elemental analysis and single-crystal X-ray diffraction. X-Ray diffraction analysis reveals that the title molecule essentially assumes a planar conformation except for the F atoms.

Abstract: As one of the raw material resources in China, chromium salt production has been paid to close attention. Alkali process of chromium salt produces serious environmental pollution, while acid production of chromium salt has separation problems of chromium-iron ions. The separation process of chromium-iron ions in acidic solution by the combination technology of hydrothermal method and ihleite method is studied in this paper. which finds that: with the increase of reaction temperature or with the extension of reaction time, precipitation rate of iron increases, while loss rate of chromium decreases.

Abstract: Modified polyurethane fiber was prepared by wet spinning method, Different amount of chitosan powder that dissolving in polyurethane solution to get spinning solution were examined. This materials presents excellent adsorption capacity on Pb²⁺. the absorption type on Pb²⁺ of this modified fibers was monomolecular. The modified fibers get the maximum adsorption 25.53mg/g when the quality ratio of chitosan and polyurethane was 1:1 under the condition of 30°C and pH 6.

Abstract: The crystallization behavior and crystalline structure of poly (lactic acid) (PLA) filled with a novel nucleating agent (TMC328), which is a kind of aromatic amide derivatives, were investigated using differential scanning calorimetry (DSC) and wide angle X-ray (XRD). In isothermal crystallization from the melt, the present of TMC328 remarkably affected the isothermal crystalline behaviors of PLA. PLA/0.5% TMC328 sample exhibited very short crystallization half-times at 90-130 °C. Furthermore, the Avrami theory was used to describe the isothermal crystallization kinetics of PLA/TMC328 samples. It is confirmed that TMC328 showed a significant heterogeneous nucleation effect on the crystallization of PLA matrix. Moreover, XRD measurement indicates that TMC328 is a kind of α-form nucleating agent for PLA.

Abstract: Porous slag haycite for phosphorus removal was made from slag, as the main raw material, clay, as binder, and ammonium hydrogen carbonate, as a pore forming agent. And the influence of material ratio and sintering condition were investigated. The best ratio of steel slag: Clay: ammonium hydrogen carbonate was 53.5%:42.5%:4% as ascertained, and the best sintering temperature 800°C, sintering time 60min. The porosity of slag haycite was 2 times more than original slag, and the specific surface area was increased evidently, thus very conducive to microbial growth.

Abstract: Rosin based polyether polyols were synthesized from rosin formaldehyde adduct, propylene epoxide and ethylene epoxide in the presence of catalyst. Rigid polyurethane foams (PUFs) were prepared with these rosin-based polyols and compared with foam made with an industrial polyether polyol (TC-4110) and rosin-based polyester polyols. The mechanical and thermal properties of foams were analyzed by some methods. The experimental results show that the foaming behavior for the foams prepared from such rosin based polyether polyols is similar to that of industrial products, but the reaction activities were higher, the viscosities are much lower. Furthermore, their 10% compression strength and thermal stability were higher and the dimensional stability is similar or somewhat better than that of TC-4110 system. All these unique properties of rigid PUFs made with rosin based polyether polyols were more suitable for as industrial production.

Abstract: The Synergistic Corrosion Inhibition of of Sodium Molybdate and Sodium Silicate for Mild Steel in 5 % Kcl Solution at 25 °C was Investigated Using the Conventional Weight Loss Measurement Method and Potentiodynamic Polarization Method. the Obtained Results Show that Carbon Steel can be more Efficiently Protected by the Mixture of Sodium Molybdate and Sodium Silicate than Single Sodium Molybdate or Single Sodium Silicate in 5 % Kcl Solution at 25 °C. Tough the Concentrations of Single Sodium Molybdate or Single Sodium Silicate Reaches up to 1000mg/L, but their Inhibition Efficiencies are both under 74 %. however, when the Concentration of the Combined Inhibitor of Sodium Molybdate and Sodium Silicate is only 200 Mg/L its Inhibition Efficiency is still above 88 %.

Abstract: Considerable progress to synthesize magnesium diboride (MgB₂) films by electron-beam annealing has been made. A series of MgB₂ films with a T_c higher than 35 K had been fabricated. MgB₂ film superconductivity is affected by electron-beam accelerating voltage, beam current, annealing duration, beam spot size and Mg/B ratio. In order to fabricate better MgB₂ films, these influence factors must be intensively studied. In this paper, the influence of e-beam current on superconductivity was investigated with an accelerating voltage of 32 kV, an annealing time of 0.26 s and different annealing beam currents of 9.9 mA, 10.7 mA, 12.8 mA, 13.3 mA and 14.0 mA. The results show the MgB₂ film with 12.8 mA has the highest T_c and the densest structure. Its zero-field J_c at 15K has reached 3.2×10⁶ A/cm². The variation of the film superconducting properties with the beam currents was grasped, which will lay the foundation for the fabrication of high quality MgB₂ thin films

Abstract: There exist angular offset and eccentricity between target and substrate in most practical multi-target magnetron sputtering systems, which should be seriously considered when we calculate the film distribution. This simulation results suggested that excellent thickness uniformity can be obtained when increased the substrate-target distance, angular offset, and eccentricity, but decreased the film thickness simultaneously. However, superior uniformity films without reducing the thickness remarkably can also obtained when the geometry configuration are proper configured.

Abstract: Nickel-cobalt alloy deposits were prepared on copper substrate by electrochemical deposition at various cobalt concentrations in electrolytic solution of 0, 6, 12, 18 and 24 g l^-1. The deposition was performed at current density of 30 mA/cm². X-ray diffraction measurements confirmed that all nickel-cobalt alloy films formed have face-centered cubic structure. EDS studies showed that Co content in Ni-Co alloys increased with the increase of cobalt sulfate concentration in the solution. It can be suggested that increasing concentration of co sulfate is the reason for an increase in activity of cobalt ion. The investigations on the electrodeposited Co-Ni alloys have been shown that their microstructure and surface morphology were found to depend strongly on the Co content in the Ni-Co alloy deposited.