Advanced Materials Research Vol. 1081

Abstract: The cure characteristics of NR and constant viscosity natural rubber (CVNR) prepared with sulfuric acid diammonium were studied. The results showed that the relation of dependence of t_C10 and t_C90 on temperature was as follows: NR>CVNR and CVNR>NR respectively. The sensitivity of t_C10 increment to t_C90 increment due to increasing of cure temperature followed the rule below: NR>CVNR. The M_Ho of NR was bigger than that of CVNR.

Abstract: The effect of constant viscosity natural rubber (CVNR) prepared with hydrazine dihydrochloride was studied, The results showed that the relation of dependence of t_C10 and t_C90 on temperature followed the rule below: CVNR > NR a;the sensitivity of t_C10 increment to t_C90 increment due to increasing of cure temperature followed the rule below: NR>CVNR; The relation of MH0 were as follows: NR>CVNR.

Abstract: nanoporous structure is attractive since it exhibits excellent structural stability would enhance the volumetric energy density compared with the irregularly shaped nanoparticles. The porous Mn₂O₃ and Mn₂O₃@SiO₂ microsphere spheres have been successfully prepared on a large scale were obtained via a general and sample supersonic atomization method combined with the modified Stöber method.

Abstract: 4-Oxo-4H-chromene-3-carboxylic acid (8) is an important intermediate in many biologically active compounds. In this work, a rapid synthetic method for compound 8 was established. The compound 8 was synthesized from the commercially available 1-(2-hydroxyphenyl) ethanone 9 through two steps including vilsmeier reaction and oxidation by Jones reagent. The structure was confirmed by ¹HNMR and ¹³CNMR spectrum. Furthermore, the synthetic method was optimized.

Abstract: The bamboo processing residues, as raw material, was modified by quaternary ammonium to obtain a quaternary ammonium modified bamboo powder adsorbent. The phosphate’s adsorption capacity of the powder adsorbent was investigated. In addition, the effects of dosage, pH, time, temperature, initial concentration on phosphate’s adsorption capacity. Then, the research performed the adsorption isotherm model fitting. The results showed that the adsorption rate of modified bamboo powder to phosphate increased with increase of dosing amount of modified bamboo powder, tended to be equilibrium when the removal rate reached to 97%; while the phosphate with high initial concentration could improve the adsorption capacity of modified bamboo powder. In acidic condition, the modified bamboo powder presented unsatisfied adsorption effect on phosphate, when pH= 6 the adsorption effect become well, but adsorption effect did not vary apparently with the increase of pH. With the increase of temperature (25, 35, 45°C), the maximum saturated adsorption capacity of modified bamboo powder gradually reduced. The adsorption of modified bamboo powder on phosphate was a rapid process, which could reach equilibrium status within 50 minutes. The bamboo powder before and after the modification was conducted IR element analysis, the values before modification are N=0, C=45.54 and H=6.03; while after the modification, the values are N=2.65, C=40.33 and H=6.79, it is concluded that the nitrogen content of modified bamboo powder increase obviously and the quaternary ammonium can well be grafted.

Abstract: This paper made the detailed discourse for the study on using cellulase, hemicellulase hydrolysis of poplar fiber raw material to make glucose. The raw material used in this experiment is poplar, cellulase and hemicellulase enzymes are used. Hemicellulase is a complex system, xylose is regarded as the main chain for a lot of hemicellulose. The experiment used dry poplar as raw material, through the ball mill, ground poplar into wood powder. In the experiment, the optimal condition of enzyme hydrolysis of wood powder has been discussed based on reaction temperature, reaction time, enzyme concentration, and the pH value of reaction. Finally, under the optimal condition, use enzyme to hydrolyse wood powder, measure reducing sugar content by the DNS method, and calculate the rate of hydrolysis.

Abstract: The p-aminobenzensulfonate-phenol-formaldehyde (APF) condensate is synthesized and characterized by FTIR and TGA analyses. Its properties as drilling mud fluid loss reducer are studied with respect to fluid loss and particle size distribution. In addition, the effect of salt on properties of APF condensate was discussed. Test results show that the APF condensate not only possesses higher thermal stability than sulfomethylated phenolic resin (SMP), a commercial drilling mud additive, but also achieves good property of fluid loss control by reducing the permeability of filter cake; the fluid-loss controlling properties of APF condensate dropped with the increase of concentrations of NaCl.

Abstract: With lanthanum chloride solution as raw material, and use the hydrogen peroxide of clean and pollution-freeobtained from oxidation reaction as auxiliary reagent, and with the carrier gas together form spray pyrolysis to obtain lanthanum oxide. On the one hand, in the hydrogen peroxide system, the temperature of direct pyrolysis reaction of lanthanum chloride solution decreased obviously, The reaction temperature is decreased from 1280°C to 1000°C or less. That reduce the energy consumption and simplify the requirements of pyrolysis equipment technology. The production process does not use NH₃^.H₂O and NaOH to precipitate. It does not produce the traditional process of NH⁴⁺, Na⁺ to pollute water. It can greatly reduce the damage to the environment, and can product with high yield, high purity of the rare earth oxide. This method not only applies to the pyrolysis of the rare earth chloride solution, also applies to metal chloride solution, such as FeCl₃, AlCl₃, NiCl₂. It was shown that the reaction temperature has been effectively reduced, V_LaCl3: V_H2O2 with 1: 1.5 can get high purity of La₂O₃.

Abstract: In this work, novel Fe₃O₄–hyperbranched copper phthalocyanines (Fe₃O₄–CuPc) nanostructures were fabricated via a simple solvent-thermal method, and the electromagnetic absorption property of the composites was investigated. The introduction of CuPc molecules were not only attached to the surface of Fe₃O₄ in form of beads, but embedded in the interior of Fe₃O₄. Importantly, the Fe₃O₄–CuPc composites exhibit excellent microwave absorbability, compared with that of Fe₃O₄. The composites with a coating layer thickness of 4.0 mm exhibit a maximum absorption of –30.3 dB at 10.2 GHz and the bandwidth below −10.0 dB reaches up to 10.6 GHz (from 7.4 to 18.0 GHz range). The excellent microwave absorption properties are ascribed to the improved impedance matching. The as–prepared novel Fe₃O₄–CuPc composites are shown to be lightweight, strong absorption, and broad frequency bandwidth microwave absorbers.