Advanced Materials Research Vol. 830

Abstract: Solketal is widely used as organic solvent, plasticizer and pharmaceutical intermediates. A synthetic technique for solketal, which is characteristic of being catalyzed by sulfonic acid resin, was developed. Experimental results showed that the suitable synthetic conditions for solketal were as follows: mass ratio of two kinds of raw materials, glycerol to acetone, is 1:20, catalyst DT-851 sulfonic acid resin dosage is 5% (wt, calculated by glycerol), reaction temperature is 58 °C and reaction time is 2 h. The product solketals yield is 95% with purity above 99% under the optimal conditions. This new technique features mild reaction conditions, easy purification, high yield, and less pollution and therefore, it is a kind of clean and green production technique.

Abstract: Epoxidized methyl-α-eleostearate (EME) is a new kind of plant oil-based epoxidized aliphatic acid ester which starts from Tung oil. Tung oil is a special, but abundant biomass resource in China. A solvent-free synthetic technique for EME catalyzed by cation exchange resin was developed. Experimental results showed that the optimal synthetic conditions for EME were as follows: cation exchange resin dosage 5% (wt, calculated by methyl-α-eleostearate), material molar ratio of methyl-α-eleostearate, H₂O₂ and CH₃COOH 1:5:2.5, reaction duration 3 h and reaction temperature 65 °C. EME epoxy value reaches 6.5% under the optimal preparation conditions. The newly developed green technique features low cost, simple operation, low energy consumption, less pollution, short production cycle and good quality and is promising to be industrialized.

Abstract: A new Na (I) complex, [Na (H₂O)₅(DMF)]·(L) (L=1,5-naphthalenedisulfonate) has been obtained in the CH₃CH₂OH and a little DMF solution. The complex was characterized by X-ray single crystal diffraction analysis. The results showed that the local geometry around central Na (I) ion can be described a distorted octahedral environment which connected by five water molecules and one DMF molecule. The complex formed one dimensional chain structure through intramolecule and intermolecule hydrogen bonds and π-π stacking.

Abstract: The complex of di-(2-methyl-8-hydroxyquinoline) zinc (Zn (2-mq)₂) was synthesized. The complex was characterized by elemental analysis, ¹HNMR, ¹³CNMR, infrared, UV-vis, XRD and molar conductivity. The zinc (II) ion was found to coordinate to the oxygen atom of phenolic hydroxyl and nitrogen atoms of 2-methyl-8-hydroxyquinoline and the complex conformes to 1:2 metal-to-ligand stoichiometry. The fluorescence properties of the complex in solid and solution were studied. The complex exhibits yellow light under the excitation of UV light. The solvent factors influencing the fluorescent intensity are discussed.

Abstract: Hexadecyl trimethyl ammonium bromide (CTAB) was used as simulated substance of organic amine wastewater, the adsorption of sodium dodecyl sulfate (SDS) intercalated ZnAl-LDH and MgFe-LDH [ZnAl (SDS)-LDH and MgFe (SDS)-LDH] on it are studied. These two kinds of LDHs all have good adsorption ability on CTAB, the COD removal degree of ZnAl (SDS)-LDH and MgFe (SDS)-LDH on CTAB can be high up to 94% and 96% due to the static electric attraction and the hydrophobic interaction between the SDS and CTAB.

Abstract: A new Mg (II) complex, [Mg (H₂O)₆]·(L) (L=1,5-naphthalenedisulfonate) has been obtained by the reaction of MgCl₂·6H₂O with sodium 1,5-naphthalenedisulfonate in the CH₃CH₂OH/H₂O (V:V=3:1) solution. The complex was characterized by X-ray single crystal diffraction analysis. The results showed that the local geometry around central Mg (II) ion can be described a distorted octahedral environment which connected by six water molecules. The one domensional chained structure of complex formed by hydrogen bonds of intramolecule and intermolecule and π-π stacking.

Abstract: A novel ten-interpenetrating structure of 1,3,5-benzenetricarboxylic acid was grown under solvothemal condition after heated it 16 hours. It was characterized by FT-IR, HNMR, X-ray diffraction, HRTEM. HRTEM obtain the relevant information of structural morphologies. The result of HRTEM showsed this material owned special lamella structure. X-ray diffraction showed the crystal of the new structure is of monoclinic system, space groupP1 with a=26.5039(17), b=16.4121(17),c=26.550(2)Å,α=90.00, β=91.533(2), γ=90.00, V=11544.4(17)ų, Z=8, Dc=1.451g/cm³,μ=0.126mm^-1,F(000)=5184, R=0.0891 and w (R)=0.1819 for 11318 observed reflection with I>2(I),hydrogen bond contributed to the stability of the structure. The fluorescence spectra indicated that the title compound had two stronger emission peak at 346nm and 400nm. Keywords:1, 3, 5-benzenetricarboxylic acid; novel structure; ten-interpenetrating

Abstract: The reeds are the reeds of the Gramineae Lo bamboo family and they are major non-wood papermaking raw materials. Based on the importance of the reed in the papermaking, many useful discussions have been carried out about its pulping and bleaching processes (Shatalov et al.,2001).Finnish scholars reported a pulp by the xylanase treatment could reduce the segment of chloride to chlorine consumption of 25% for the first time in 1986 (Viikari et al., 1986),and it was soon put into industrial production after then. Xylanase can reduce the amount of chemical additives by improving the bleach ability of the pulp, thereby reducing environmental pollution and reduce production costs, and increase the brightness of the paper (Anatoly et al., 2007).Although many scholars have done a lot of research in biobleaching, and have made some progress, but most of the selection of microorganisms are fungi and neutrophilic bacteria, the production of xylanase is usually in the pH 5 - 7, 40-50°C which often leads to maximal activity, thus lack of compatibility with the conventional chemical pulping process. In recent years, the thermal stability of alkaline xylanase has been paid much attention (Shatalov et al.,2003). Alkalophilic bacteria secreted extracellular enzyme with heat, basophilic characteristics, can be used directly to the biopulping pretreatment and bleaching of wood and non wood raw materials. The recent study on organic solventbased pulping of giant reed showed that competitive papermaking fibres could be produced using this advanced pulping technology (Shatalov and Pereira, 2001). The amount of enzyme not only directly affects the size of pulp hardness, degree of polymerization and brightness, but also was the basis for investigating the economic of dealing with enzyme.The results of alkaline bacteria xylanase bleaching ramie fiber have been reported previously (Zheng et al., 2000). In this study, the xylanase of alkalophilic Bacillus is used in reed pulp bleaching pretreatment, and the physical and chemical properties of the enzyme to deal with the reed pulp are analyzed.

Abstract: Mechanical properties and flame retardant property of the cured epoxy resins contained different content of hyperbranched polyphosphate ester(HPPE) were studyed. The results indicated that the tensile strength and the impact strength were inceased to11.26% and 306% respectively with HPPE loadings of 15%,besides the Oxygen Index(OI) value increased from 22 to 33 which shows a good flame retardant property was obtained.

Abstract: Organic light emitting devices with the structure of ITO/ZnO/TPD/Alq₃/Al were prepared by vacuum thermal evaporation method. By establishing multi-layer structure model, the photoelectric properties of the devices with different thickness ZnO anode buffer layers were discussed, the relationship of current density and luminous efficiency with work voltage was found and the comparison analysis with CuPc devices were carried out as well. The results showed that ZnO as the stable dipole layer between ITO and TPD can reduce the potential barrier for holes injection, promote the compound of electrons and holes, when ZnO thickness was 3 nm, the devices had minimum potential barrier and best luminous efficiency, the brightness increased nearly three times than traditional CuPc devices.