Advanced Materials Research Vols. 1049-1050

Abstract: In order to study hematite of different crystallography form with hydrogen peroxide to form various kinds of Fenton-like reagent in the process of phenol removal, we discuss the effect of different shapes, particle sizes and some other factors on the degradation of phenol in the process of catalysis. This article studies the synthesis of Fenton-like reagent with hematite and its role in the process of catalysis of phenol to find the most suitable crystallography form.

Abstract: TiN coatings were prepared by using multi-arc ion plating technique at different N₂ partial pressures. The surface morphology of the coatings was characterized by using a tabletop scanning electron microscope. The cross-sectional microstructure was investigated by using a field emission scanning electron microscope. The phase composition was evaluated by using an X-Ray diffractometer. The hardness and cohesion were measured by using a nanoindentation tester and a scratch instrument, respectively. The results show that the number and size of macro-particles decrease and the compactness of TiN coating increases with the increase of the N₂ partial pressure. The hardness and cohesion of the coating increase gradually with increasing N₂ partial pressures and reach a peak at 0.6 Pa; then the hardness and cohesion are significantly lower at higher N₂ partial pressures.

Abstract: Phase change thermal control technology has gained increasing focus as an emerging technology for the thermal control of spacecraft. This literature focused on melting process inside a latent heat energy storage filled with phase change material (PCM) by numerical simulation. A matrix-based enthalpy porosity theory in a three-dimensional finite volume discretization is simulated. The temperature distribution during the melting process of PCM Cerrolow-136 and CH₃COONa·3H₂O is obtained, based on which the thermal control function and energy storage capacity is compared. The results show that Cerrolow-136 has better performance. In different states of phase change, the temperature distribution of Cerrolow-136 is fairly uniform. Thermal control face's temperature of Cerrolow-136 is closer to phase transition temperature. In the same heat flux of 3000 W/m², The whole process of thermal control temperature getting to 80°C for Cerrolow-136 is longer. Cerrolow-136, for its excellent characteristics, has potentially broad application in the fields of latent heat energy storage and space vehicle electronics.

Abstract: Methane and carbon dioxide of different pressures were absorbed by the anthracite coal for 5 hours in high pressure reactor. When adsorption experiment was completed, pressure is reduced quickly. The content of pulverized coal which was produced by releasing gas quickly, was used to reflect capacity of gas adsorption. The result showed that the content of pulverized coal which was produced by adsorbing CH₄ was higher than that was produced by adsorbing CO₂ on the same coal under the same pressure. Langmuir isotherm and Freundlich isothermal can describe coal methane adsorption. Freundlich isothermal can be a good description of coal carbon dioxide adsorption.

Abstract: In recent years, Asbestos fibred gaskets are gradually replaced because of its serious health damage. Non-asbestos gasket is a heated discussion nowadays and the research of it will be of great significance. The present thesis firstly expounds the sealing principle of gasket, and then explains the main property index and its characterization method. Finally analyses and summarizes the main factors which we must consider to improve the sealing property of non-asbestos fiber gasket, and points out the main research ways of non-asbestos in the future.

Abstract: Coal direct liquefaction residues (CDLR) are derived from coal direct liquefaction process, with the yield about 30% of raw coal. CDLR must be used effectively for the purpose of whole economy, resource utilization and environmental protection. In order to separate the liquid components from ash in CDLR, three kinds of iron-containing magnetic ionic liquids ([bmim]FeCl₄, [bPy]FeCl₄, [bmP]FeCl₄) were synthesized, extraction-deash of CDLR was exprimented, and extracts from CDLR were characterized. According to the quantitative analysis and infrared spectroscopy (IR), results showed that [bmim]FeCl₄ was an effective solvent in extraction-deash of CDLR using ultrasonic oscillation instead of traditional mixing methods, compared with [bPy]FeCl₄ and [bmP]FeCl₄. Extract by [bmim]FeCl₄ had ash ratio of 1.0%, while ash ratio of CDLR was 17.3%, which met the requirement of low ash content. At last, extraction-deash mechanism was discussed to further understand the research.

Abstract: In this paper, the relationship is studied by spectrophotometric method between the structure of reactive yellow X-R, reactive yellow K-6G, reactive yellow KN-GR, reactive yellow M-5G, reactive yellow M-3RE, reactive yellow EF-3R and their colors, poplar veneer dyeing characteristic parameters S, E, R, F values, exhaustion curves and fixation curves. The results showed that longer conjugated system and better coordination of electron donor and acceptor group and smaller steric hindrance generates longer absorbance wavelength. The S value of six active dyes is reactive yellow X-R> reactive yellow KN-GR> reactive yellow K-6G> reactive yellow M-5G> reactive yellow M-3RE> reactive yellow EF-3R, the R and E and F value is reactive yellow M-3RE> reactive yellow M-5G> reactive yellow EF-3R> reactive yellow X-R> reactive yellow KN-GR> reactive yellow K-6G. The exhaustion and fixation rate is increasing with the increasing of time, except that the exhaustion containing single chlorine-triazine is decreasing within 10min after addition of alkali.

Abstract: A series of vinylidenefluoride (VDF) and chlorotrifluoroethylene (CTFE) copolymers were prepared by radical copolymerization, the chain elements structures of the copolymers were gain with the elemental analysis, and the crystal regions with X-ray diffraction spectrum. The effect of chain elements structure on the crystallinity and dynamic mechanical properties was discussed with the DMA analysis. The result shows: the increasing of the CTFE content decreases the chain elements structure of VDF-VDF, the random distribution of VDF-CTFE structure has a great effect on the crystallization properties and the dynamic mechanical properties. The increasing of CTFE content improves the storage modulus and the damping of copolymers in the amorphous copolymers, while the distribution of chain segments’ length gets narrower.

Abstract: Water-soluble phenolic resin was synthesized via two-step alkaline catalytic reaction. The influences of synthesis process conditions on hydroxymethyl content of water-soluble phenolic resin molecular chain were also studied. The results show that the increase of formaldehyde dosage, as well as the increase of reaction temperature and reaction time, the content of hydromethyl in resin increased first, and then decreased. Without the addition of stabilizer, polymer weak gel for flooding was synthesized with HPAM crosslinked water-soluble phenolic resin. The performance analysis of the weak gel shows that the change of viscosity of weak gel corresponds to the change of the content of hydromethyl in resin. Phenolic resin with good water-solubility and strong reaction ability to HPAM was polymerized and the reaction conditions are as following: phenol and formaldehyde in mol ratio 1:2~1:3, in solution with pH= 9~10, under final condensed polymerization temperature 85°C and in condensed polymerization time 30 minutes.

Abstract: Bagasse xylan chlorosulfonate was synthesized by the esterification between bagasse xylan and esterification agent which was prepared by the chlorosulfonation from chlorosulfonic acid and pyridine. The effect of reaction parameters such as reaction temperature and reaction time was investigated for esterification of bagasse xylan with chlorosulfonic acid by single factor experiment. The degree of substitution (DS) of Bagasse xylan chlorosulfonate was up to 1.41 when the reaction was performed at temperature 45°C for 4.0h. The IR spectrometry revealed characteristic absorption peaks of the S=O and S―O at 1121.78cm^-1 and 803.20cm^-1, and this explained that bagasse xylan backbone has been joined the sulfate radical groups and bases successfully. The microstructure of bagasse xylan chlorosulfonate was also investigated by SEM.