Advanced Materials Research Vols. 557-559

Abstract: Copper coating was deposited on the surface of low-temperature expandable graphite (LTEG) by electroless plating method. The effects of reaction temperature, Ni²⁺ concentration and pH value on the copper deposited low-temperature expandable graphite (CDLTEG) were discussed. The experimental results show that reaction temperature of 65~70°C, Ni²⁺ concentration of 0.006mol/L~0.008mol/L and pH value of 9~10 are the ideal reaction condition for CDLTEG. X ray diffraction analysis indicates that perfect copper cladding can be coated on LTEG through chemically plating method. It is found by thermogravimetric analysis that the depositing process of copper upon LTEG is exothermic. the oxidation of copper would obviously occur when temperature is higher than 270.8 °C, so CDLTEG should be expanded to prepare its expanded outcome at a lower temperature than 270.8 °C. The 3 mm wave dynamics test makes it clear that deposited copper has an obvious improvement effect on 3mm wave attenuation performance of LTEG.

Abstract: In order to solve the waste which is generated from the recycled asphalt pavement overhaul again, this paper puts forward the idea of secondary reclaimed asphalt mixture. Through analysis the performance index of secondary reclaimed asphalt mixture and with comparison the road performance of the asphalt mixture after different recycled times,we found that, as long as mixed with the right amount of regenerative agent,the road performance index of secondary recycled asphalt mixture can be recovered to the use standard. However, with the increasing of the asphalt aged times, the declining rate of road performances of reclaimed asphalt mixture are increasing.

Abstract: The preparation of the Fe-Mo-Ni catalyst using the sol-gel method was investigated. In addition, the catalytic selective oxidations of p-xylene (PX) to terephthalaldehyde (TPAL) on the Fe-Mo-Ni catalyst were also investigated. The catalysts were characterized using thermal analysis, H₂-temperature programmed reduction (H₂-TPR), Fourier transform infrared spectra (FT-IR), and X-ray photoelectron spectrum (XPS). The additional of Ni improves the catalytic activity of the Fe-Mo catalyst on selective oxidations of PX to TPAL. The optimal additive amount of Ni is 5%. XPS analysis shows that the introduction of Ni changes the internal structure of the Fe-Mo catalyst improves catalytic performance.

Abstract: waterborne sodium bisulfite－blocked polyurethane was using polyether diols(N210), isophorone diisocyanate (IPDI) as the main material, sodium bisulfite as blocking agent, ethanol as the cosolvent. The effect of temperature and time of blocking reaction, alcohol than water were carefully studied. The best process parameter of blocking reaction: the temperature was 20°C; the reaction time was 45min; n(NaHSO3):n(NCO)=1.1; alcohol than water=1.85; the deblocking temperature determined by DSC was about 76～130°C

Abstract: A Rankine cycle using organic fluids as working fluids, called organic Rankine cycle (ORC), is potentially feasible in recovering low enthalpy containing heat sources. The choices of fluids should meet the requirement of environment, safety, critical pressure and critical temperature etc. Under the proposed working conditions, R600a, R245fa, R236fa, R236ea, R227ea are chosen as the working fluids of the low-temperature Rankine cycle system, then those fluids are investigated and compared from cycle efficiency, work ratio, exergy efficiency, irreversible loss. The results show that R245fa is an available and effective working fluid for low-temperature Rankine cycle.

Abstract: A series of cobalt-molybdenum nitride catalysts were prepared using Co-Mo oxide precursors via temperature-programmed reaction in N2-H2 mixed gases. The catalysts were characterized by N2 physical adsorption, X-ray diffraction, temperature-programmed desorption of H2. Their catalytic performance was evaluated in the model reaction of ammonia decomposition. The influence of the final nitriding temperatures on the surface properties and the catalytic perfomance of CoMoNx/CNTs were described. The catalyst nitrided at 650°C shows the best catalytic performance. The results indicated that a suitable final nitriding temperature contributes directly to the formation of nitrides and favor the catalyst activity.

Abstract: Large-sized, crack-free silica monoliths have been fabricated by a fast and convenient way via EISA method using P123 as soft template and 1-hexadecyl-3-methylimidazolium bromide (［C₁₆mim］Br) as additive. The hydrogen bonds formed between ILs and the silano groups of silica gel play crucial roles in the form of the bulk, transparent silica monolith. The mesoporous structure onion-like carbon monoliths were prepared with the transparent silica monolith as template via the nanocasting technique. The mesoporous silica and carbon monoliths have been characterized by the XRD, HRTEM, N₂ sorption and elemental analysis. The results reveal that pore diameter of the mesoporous carbon about 3.47nm, and the specific surface area of carbon with a nitrogen content of 4.2%, can be tuned from 408.2-629.0m²/g. HRTEM shows that this carbon material with nanoonions structure.

Abstract: The rheological properties of plastisols based on low-toxicity plasticizers have been evaluated using a DV-79+ pro coaxial cylinder viscometer by steady shearing. The effect of plasticizer and temperature on the shearing rate dependence of apparent viscosity, non-Newtonian index ( n ) , as well as apparent activation energy ( Ea ) was investigated. The results indicate that all the plastisols prepared in this experiment show shear thinning pseudoplastic behavior before and after aging process. The plastisols prepared by DOTP shows an obvious shear thinning behavior than that of plastisols prepared by ATBC and DINCH. The dependence of viscosity properties on temperature of plastisols accord with Arrhenius formula except DOTP-based system, and the apparent activation energy of plastisols prepared by DINCH is bigger than that of plastisols prepared by ATBC.

Abstract: With Ca²⁺ ions as cross-link agent, chlorpyrifos-loaded attapulgite/sodium alginate hybrid microspheres were prepared by extrusion method. The hybrid microspheres were characterized by FITR, DSC, SEM techniques to gain insights into the structural and morphological features of the microspheres. Meanwhile, the release properties of the drug-loaded hydrogel microspheres for chlorpyrifos were tested. The experimental results indicate that, chlorpyrifos were loaded in calcium alginate microspheres in the forms of partial differential aggregation and molecular disperse, and there exists hydrogen bond between sodium alginate and attapulgite. The release effect of hybrid gel microspheres for chlorpyrifos can be divided into two stages, namely, the burst release and the sustained release. With the increasing of the attapulgite content, the release rate during the sustained-release phase and the amount of pesticide during burst release will be significantly reduced. The introduction of attapulgite can change the micro-phase structure of the drug-loaded sodium alginate gel, which is conducive to improve the release effect of gel microspheres for pesticides, thus promoting the release performance of drug-loaded sodium alginate microspheres.

Abstract: Tribology behavior of Nanodiamond(ND) polyurethane(PU)/epoxy(EP) interpenetrating polymer networks hybrid materials were tested by friction wear testing machine. Results showed that when EP content was 30%, resultant PU/EP IPNs exhibited best wear resistance. For ND-PU/EP IPNs hybrids, when the ND addition was 0.2wt%, the best wear resistant ability was obtained. Under dry condition, the effect of wear parameters, such as rotational speed, load and central distance to friction and abrasion value were also investigated.