Advanced Materials Research Vols. 418-420

Abstract: This paper presents an experimental investigation on flexural performance of carbon fiber reinforced bonding composite circular tubes with different length of reinforcing pieces. Four kinds of composites bonded tubes with different reinforcing pieces length 20mm, 30mm, 40mm and 50mm were carried out. The flexural strength and modulus of bonged composite samples tested were investigated. The experiment result indicates that the length of reinforcing pieces has some effects on the flexural performance of bonding composite circle tubes. The average flexural strengths of samples reinforced 20mm, reinforced 30mm, reinforced 40mm and reinforced 50mm are 41%, 45%, 49% and 51% of average flexural strength of boned samples without bonding, respectively. The bonding strength will improve when the length of reinforcing pieces increases. The modulus does not change when reinforcing length was greater or equal than 30mm. The main typical failure modes of tested specimens are adhesive cohesive failure and interlamination failure between prepreg and adhesive film.

Abstract: Abstract. The effect of uniaxial stretching of different stretching ratio at 80 °C, 90°C, 100°C, 110 °C and 120°C on the crystallization behavior of polylactic acid (PLA) film was investigated by using differential scanning calorimetry (DSC), wide-angle X-ray diffraction (XRD) and polarizing microscope (POM). The results showed that the crystallinity of PLA film was improved via uniaxial tensile orientation and increased with increasing stretch ratio, and the crystallinity of PLA film reached the maximum under the conditions of 90°C and stretching ratio 300%. Stretched PLA films show α crystal form. The spherulites deform to ellipsoids after stretching.

Abstract: In this work, the constructing of different carbon nanostructures materials were studied, and the single-structure and pure surface of carbon nanostructures were employed to as catalyst support and the morphology and structure of different carbon nanostructures-based catalysts were investigated. NO catalytic reduction was used as a probe reaction to investigate the catalytic properties of different carbon nanostructures materials and how the controlling of carbon nanostructures would affect its catalytic functions. The results show that vanadium was molecularly anchored on the surface of carbon nanostructures and the mesh-carbon nanotubes as a support show a high catalytic activity.

Abstract: Honing pneumatic measuring systems are widely used in pressure gas line now, and pressure gas line characteristic curve is the theoretical design basis of differential pressure gas line, drawing and analysis differential pressure gas line characteristic curve is an essential link. Based on Origin powerful graphics capabilities; you can quickly and easily draw the pressure gas line characteristic curve.

Abstract: An amphiphilic graft copolymer was obtained via atom transfer radical polymerization (ATRP) of methacrylate (MMA) initiated directly by polyvinylidene fluoride (PVDF). Hydrophilic PVDF membranes were prepared by immersion precipitation of PVDF-g-PMMA and PVDF blend solutions. The chemical structure and the molecular weight were characterized by ¹H-NMR and GPC. The hydrophilicity of membrane surfaces were characterized by static water contact angle. Top surface and cross-section of membranes were observed by Field Emission Scanning Electron Microscope (FESEM). The results demonstrated the water contact angle of the membrane surface decreased from 89°to 67°, indicating enhanced hydrophilicity; the pure water flux water firstly decreased and then increased up to 1.7 times of the PVDF membrane. The retention of PEG (Mn=6000) could be maintained at 93%-95%.

Abstract: Thermal properties of 5 natural resin and wax samples (shellac, rosin, shellac wax, beeswax, Chinese insect wax) were examined by differential scanning calorimetry (DSC). The DSC melting and crystallization curves of the samples were presented in this paper. Three DSC parameters, T_o, T_f and ΔT (difference between To and Tf), were selected from each curve. Evaluation results of the parameters showed that they were statistically significant with individual excellent reproducibility. Information was provided by evaluation of changes among thermal absorption or release peaks of the curves in differentiating the five resins and waxes. It was demonstrated in this paper that DSC is rapid, convenient, reliable and accurate to qualitatively identify the resins and waxes mentioned above.

Abstract: Wrinkle is a favorable template for patterning cells or particles. A new approach is developed to control and fabricate PS colloidal crystals with the reversible wrinkle on PDMS substrate/Pt film stressed system. The obtained structure is characterized by optical microscope and scanning electron microscope. It demonstrates that the settlement of colloids can be regulated by the buckling wavelength which can be tuned by varying the film thickness and substrate mixture mass ratio. Compared with monolayer PS film patterned on herringbones pattern wrinkle, the film on stripes pattern wrinkle always has low defect rate. It is meaningful for fabricating large-scale regular spacing and high-ordered PS colloid films.

Abstract: Height lightweight is one of key technology to dock structure that is made up of the sandwich composite board and satisfy requirements of bending rigidity feature. This paper proposes a new engineering optimization method which is both precision and economical. First, through theoretical calculation, to get bending stiffness( , ) and twist stiffness( ). Afterwards ,based on structures bending theory ,we could get the stiffness equation of the model , and calculate the quality equation of the model equations. Supposed the maximal stiffness as objective function ,height(h) of rib and space of rib(a) as design variable.Using MATLAB software and ABAQUS finite element software, we could get the Optimized design program that is to meet the requirements of the structural characteristics of sandwich composite panels of the dock structure. In 100 tons load, when the length of plate is 1m, thickness of plate is 4mm, the height of the rib is 40 mm, the spacing of the rib is 75 mm, and when the height is 45 mm, the spacing is 95 mm, the bending performance of the whole mode lis betterand the quality is more lighter.

Abstract: Non-water taphole clay was prepared by using high alumina ((Al2O3)>85%,Particle Size is 3~1, ≤1 mm),coke, clay, kyanite, Ferrosilicon Nitride Powder and Corundum powder, adding more 15% tar as the binder and Si-SiC (0,4%,8%,12%) to replace Ferrosilicon Nitride. Specimens with dimensions of φ50mm × 50mm and 125mm × 25mm × 25mm were prepared under a uniaxial pressure of 5MPa. The microstructure, high temperature bending strength (600oC,800 oC,1000 oC,1200 oC,1400 oC) and apparent porosity and sinter ability of the tap hole clay were studied. The influence of the substitution content of Si-SiC of the tap hole Clay was also investigated. The results showed that the high temperature bending strength of the samples decreased with the increasing of Si-SiC and apparent porosity almost no changing, but it could still met the need of the actual requirement. The Si-SiC substitution content within 5% of the tap hole clay has also good performance. Through the analysis of the microscopic structure of the tap hole clay, the tap hole clay with Si-SiC has good sinter ability.

Abstract: Based upon the single electron energy state information and the combination of Racah’s group-theoretical consideration with Slater’s wavefunctions, the 91×91 complete energy matrix of 4f² configuration ion Pr³⁺ in C_3v crystal field has been constructed. The calculated Stark energy levels of CsCdBr₃:Pr³⁺ present a good agreement with the experimental values, which implies that the complete energy matrix method can be received as a recommendable tool to perform a theoretical analysis to the doped crystal. Besides, the influence of Pr³⁺ ions on the energy levels splitting of the host crystal CsCdBr₃ has been compared with two doped trichlorides by Pr³⁺ ions, which indicates that the sixth order crystal field parameters play an indispensable role in splitting the energy levels.