Advanced Materials Research Vol. 496

Abstract: Ionic liquids 1-brutyl-3-methylimidazolium Tetrafluoroborate [BMIM]BF4 and 1-brutyl-3-methylimidazolium hexafluorophosphate [BMIM]PF6 were synthesized directly from 1-butylbromide, 1-methylimidazole, sodium tetrafluoroborate or hexafluorophosphate using microwave by one-pot under solvent-free conditions in an unmodified household oven. This method requires only a few minutes of reaction time, in contrast to the several hours needed using conventional methods by two pots that requires a lot of organic solvent. The reaction yield of ionic liquids with intermittent microwave heating is much higher than that of ionic liquids with conventional microwave heating. Thus the intermittent microwave heating is a good method for the reaction. The yield of the two ionic liquids increased slightly with increment of molar ratio of sodium tetrafluoroborate or potassium hexafluorophosphate.

Abstract: The pyrolysis of three stalk was studied to estimate the effect of pyrolysis conditions on product yield, calorific value and proximate analysis. Heating rate and pyrolysis temperature were the main experimental parameters. According to the test, when the heating rates were at 5, 10 and 15°C/min, the low heating rate reacted more thoroughly, got high yield and kept more energy. As the pyrolysis temperature rising; namely 200,300,400 and 500°C;the fixed carbon and gross calorific value were increasing to be 68% and 24.72 MJ/Kg respectively, but the yield was decreasing.

Abstract: In order to obtain more detailed microcosmic information of propellants, NG propellant for example, characterization ways and conclusion analysis via SEM and AFM were introduced respectively. After comparison analysis of two experimental results, AMF gained more quantitative measurement results, such as friction force, topography, force-distance

Abstract: In order to get better interior ballistic performance of deterred-coating propellant charge (DCPC), the simulated annealing algorithm optimization of DCPC carries out in this paper. The interior ballistic model of DCPC and its model of simulated annealing algorithm optimization are established based on the characteristics of deterred-coating propellant. Two key parameters of DCPC, the mass ratio of deterred-coating propellants to total propellants and the average perforation pressure of deterred-coating propellant，are optimized for the search of the maximum muzzle velocity under the restricting conditions of maximum chamber pressure and the maximum relative end point of combustion. The optimization results agree well with the standard charge parameters, which justifies the feasibility of the model.

Abstract: In this paper, a new control scheme of a variable speed grid connected wind energy generation system was presented. The scheme used a squirrel-cage induction generator (SCIG) as generator and it connected to the grid through a back-to-back double PWM converter. According to the characteristics of induction motor, the generator side adopted rotor flux linkage oriented slip frequency vector control technology, and the grid side used the network voltage oriented control and voltage and current dual close-loop control strategy. The simulation results show that the system can work in the state of variable speed constant frequency (VSCF)power generation and the active and reactive power can be controlled with no mutual interference and with good static-dynamic performance.

Abstract: A novel kind of poly(diphenylsiloxane-co-dimethylsiloxane)s modified MQ silicone resin were synthesised by the hydrolysis and condensation of diphenyldimethyloxysilane, dimethyldimethyloxy- silane, tetraethyloxysilane and hexamethyldisiloxane. The structure of the copolymers was confirmed by 1H and 29Si NMR. Their molecular weights were determined by GPC. Thermal transitions were characterized by DSC. In addition, the thermal stabilities were evaluated by TGA. Results indicated that the increasing content of phenyl mol% in copolymer enhances the optical and thermal properties of the copolymers. Moreover, it can be used as a potential vinyl terminated component in hydrosilylation materials in PSA and LED encapsulation.

Abstract: Paint aging will take a long time under the conditions of natural exposure, their failure mechanism can't be known quickly. So the artificial UV-condensation accelerated aging test is used to alkyd system and polyurethane system, and the coating aging was analyzed by using SEM, gloss meter and FTIR. The results shown that their failure mechanism is different, the main reason that life of alkyd system was lower than polyurethane system is its weak water-resistant. If the water-resistant of alkyd system can be improved, the use area of alkyd system will be expanded.

Abstract: This paper is about a design to steel structure anticorrosive coating of one domestic bridge which is 100-year design Life by using the latest life cycle cost analysis (LCC).With comparing the fees of four painting program, the most optimized economic is program IV, that is arc spraying aluminum、dilution epoxy MIO, universal epoxy antirust paint and polyurethane topcoat system. It has a important guiding significance to design anti-corrosion coating of other bridge steel structure.

Abstract: Functional properties of nanophase materials are different from conventional materials, which determined the related technology for the rapid development and wide application space. Nanophase materials have been widely used in sports stadiums, sports turf, athletics track, sports clothing, sports equipment and sports supplements, and so on. At the same time, there may be a negative effect of nanophase materials on cell, lung, liver, kidney and brain. Therefore, the biological study of nanophase materials should also be strengthening.

Abstract: In the present work, we synthesized microcapsules with copolymer of acrylonitrile and ethyl acrylate as shell and isooctane as core by in situ polymerization, and then optimized the preparative method. Synthesized microcapsules were characterized by Fourier transform infrared spectroscopy (FTIR), ¹³C nuclear magnetic resonance (¹³C-NMR), scanning electron microscopy (SEM), particle diameter analysis and thermogravimetry (TG).