Applied Mechanics and Materials Vol. 189

Abstract: Living radical polymerization of 3-O-methacryloyl-diaceton-D-glucose was carried out by the atom transfer radical polymerization (ATRP) method with an alkyl halide/copper-complex system. The effect of initiators, catalysts, ligand, and temperature on polymerization was studied in detail. Under the optimum condition, the time-conversion first-order plot was linear and the polydispersity of giycopolymer is relatively low, indicating that the polymerization is well controlled.

Abstract: The catalyzed liquefaction degradation of beet pulp (BP) had been studied in the system of solid silicotungstic acid and polyethylene glycol 400 (PEG400)/glycerol (GLY), in which the solid silicotungstic acid served as the catalyst, and the latter was the complex liquefacient. This paper investigated the influence of processing conditions of BP liquefaction on the liquefaction reaction and the properties of liquefaction product. The results showed that BP had a good liquefaction effect, and the optimum liquefaction processing conditions were founded as follows: the weight ratio of PEG 400/glycerol was 4:1, the liquefaction temperature was 175oC, the catalyst amount was 8%wt, the solid-liquid weight ratio was 1:12, and the liquefaction time was 135 min. In these conditions, it was found that the best liquefaction rate would reach 99.5%, the hydroxyl and acid values of liquefaction mixtures were 52-82mg/g and 0.61-0.75mg/g respectively, the final products were lower hydroxyl value plant-based polyol.

Abstract: On the basis of the CT mountings’ technology characteristics produced by Furan resin self-hardening sand, and aiming at the easy appearing defects in the progresses, the reasonable solution had proposed. Practice has proved that, through the scientific selection of raw and auxiliary materials, controlling the molding the environment conditions and strict management of key processes, can improve product quality to meet customer needs.

Abstract: The continuous production of water-soluble low-molecular-weight chitosan (WSLMWC) was successfully achieved with an innovative continuous production system which consisted of ozone generating subsystem, degradation subsystem, and fractionation subsystem. The continuous production of the WSLMWC was performed through three uninterrupted steps: the first, the continuous preparation of the ozone from compressed oxygen, the second, the continuous degradation of chitosan by ozone treatment, and the last, the continuous fractionation of the WSLMWC from the degraded chitosan solution (DCS) by ultrafiltration (UF) membrane. The DCS as the most suitable feed supplied to UF membrane was ascertained. Three different WSLMWC products as useful materials in biomedicine and food were obtained, namely LMWC-3KDa, LMWC-5KDa, and LMWC-10KDa.

Abstract: In order to analyze the relation between wood surface roughness of Laminated Veneer Lumber of Eucalyptus and sanding parameters, an orthogonal experiment and a single factor experiment were performed. The results show that the mesh of the sandpaper has remarkable influence on wood surface roughness of Laminated Veneer Lumber of Eucalyptus, but the feeding speed and sanding thickness don’t; when the mesh of the sandpaper is 150, the feeding speed is 6 m/min and sanding thickness is 0.6 mm during the first sanding and the mesh of the sandpaper is 320, the feeding speed is 9m/min and sanding thickness is 0.2mm during the second sanding, the smallest roughness (Ra) was obtained as 2.45μm. Considering production efficiency, changing feeding speed into 9 m/min, engineering optimization scheme was obtained, and the wood surface roughness (Ra) is 2.70μm.

Abstract: Preparing polyvinyl butyral (PVB) shrinkage of nanofiber by the electrospinning technology. The main effects of different process parameters on the shape and the diameter of the PVB/ethanol solution electrospun fiber have been discussed. The SEM observation as well as Image-Pro Plus Image processing and SPSS Statistics software analysis indicated that in the 6.9% concentration with 20 KV electrostatic voltage , 15 cm collect distance condition obtains the prefer nanofiber.

Abstract: The internal state variable method may be the best tool，offering researcher the model framework，certainly based on physical mechanism. A constitutive equation model framework，reported in this study， has been proposed to predict the distribution of stress of EA4T steel. The constants ，arising in this model ，are determined using an evolutionary programming (EP) optimization technique . A good agreement between the computational and experimental results was found.

Abstract: The corrosion behavior of copper in halide solutions was investigated by cyclic voltammetry, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). On this basis, the mechanism of electrochemical corrosion behavior of Cu in halide solutions has been analyzed. The study explores the corrosive effect of the halide ions on copper materials and provides a theoretical basis for the inhibition of halide ions on the corrosion of copper materials.

Abstract: The contents of oxygen and nitrogen were important effect on the high speed wire in smelting high carbon steel. Sampled from the process of producing wire rod in Xuanhua iron and steel company and analyzed the contents of oxygen and nitrogen. The quality and size of oxide and nitride were numerical statement in differernt terms. The results were shown that the size of micro inclusion was less than 15 μm, and the inclusion size was not big, but the quantity was large. The quantity of micro inclusions in wire rod was about 10 /mm2 (equivalent diameter of 5 μm). Through the practice analysis and research, we put forward the measures of inclusion control for 65 steel including raw material requirement, improving of the converter, LF refining and continuous casting operations.