Advanced Materials Research Vols. 233-235

Abstract: A rod/coil nanocomposite was prepared by a reactive mixing process of Poly(p-phenylenebenzobisthiazole) (PBZT) and Nylon66 in polyphosphoric acid (PPA). PBZT-Nylon66 block copolymers were synthesized during the reactive mixing process to act as compatibilizers of PBZT and Nylon66. The morphology and structure of the solution-cast thin film of PBZT/Nylon66 nanocomposites were investigated by using Optical Microscopy(OM), Differential Thermal Analysis(DTA), and Transmitted Electron Microscopy(TEM). PBZT were dispersed in Nylon66 matrix as fibrils which had diameters ranging from 100nm to 400nm and lengths ranging from 500nm to 2μm. The crystal behavior of Nylon66 was considerably disturbed by PBZT in the nanocomposite. Even after heating above the melting point of Nylon66, the nanocomposite exhibited no macrophase separation.

Abstract: Silicon oxide thin films have many excellent properties such as hardness, optical,dielectric properties,wear-resistance and corrosion-resistance. It has been widely used in optical and microelectronic applications. The preparation methods mainly include phsical vapor deposition and chemical vapor deposition.The paper reviews a few preparation methods of silicon oxide thin films, and compares advantages and disadvantages w ith each other. On the other hand,it point out the tendency of development.

Abstract: CNG cylinder is a sort of used storage device in CNG filling stations. As a gas storage container with high-pressure, it will lead to harmful consequences if failure occurs. The explosion consequences after its leakage are analyzed in this article. The vapor cloud explosion (VCE) quantitative evaluation model is compared with API pub 581 consequences evaluation model. And the comparison of the consequences of the explosion bteween two evaluation models is also made based on an example with a set of CNG cylinders.

Abstract: The raw material is the fused grain magnesia-chrome and Indian concentrated chrome ore . The grain size proportion which is used in the preparation as follows: 4­-1mm 50%，≤1mm 17%,≤0.088mm 33% ,the 5 group samples are prepared by respectively adding extra 2%、4%、6%、8% fine power Cr₂O₃ to basic formula .Mixing and pressed under 200Mp and sintered at 1750,holding 8 hours ,the process of preparation of samples is finished .The dimension of samples is 230mm×114mm×65mm .Conclusion: the addition of fine power Cr₂O₃ can change the base material composition of magnesia-chrome ,form more secondry spinel and intergranular spinel ,promote direct bond between periclase and spinel .Adding quantitative fine power Cr₂O₃ can enhance the room properties and high temperature properties ,but as the increase of fine power Cr₂O₃ ,the sintering property is decreased ,the results are shown that the best content of fine power Cr₂O₃ should remain at about 4% .

Abstract: Elastic polyester from glycerol and azelaic acid with different molar ratio was synthesized by simple catalyst-free esterification reaction. The ratio of azelaic acid to glycerol used in this experiment was 1:2, 1:1 and 2:1. The polyester with ratio 1:2 and 1:1 appear as clear, bubble free, non tacky and flexible after 48 hours at 125°C while the polyester with the ratio of 2:1 was cured after extension of 60 hours. The formation of ester bonds of the polyester produced is detected on the monomer molecular ratio and also on the efficiency of water removal during esterification process.

Abstract: Recently, with the advent of printers with more than four colorants, the development of selection and optimization for colorant has been an important area of research in color printing. In former studies , gamut volume are the main criterions for colorant selection, and they mainly select colorant from ink sets , which have the biggest gamut volumes. In this paper we proposed other important criterions for selection , such as hue angle, chroma of colorant and then applied these criterions for practical colorant selection.

Abstract: The fatigue strength study of the hatch corner is carried out ,based on the S-N curve method and the assumption of the linear cumulative damage of Palmgren-Miner's rule, using the hot spot stress method. Study on the effect of the structure different type to the fatigue strength of the hatch corner is carried out through changing its construction details and thickness. By comparing, the reasonable structure is obtained, and the scale effect should be put into consideration in fatigue design.

Abstract: Oxygen diffusion in MgO stabilized zirconia has been studied by molecular dynamics simulation method with MOLDY software. The results illustrate that oxygen diffusion in MgO stabilized zirconia can be decided by temperature and amount of MgO. Both increase of amount of MgO and temperature in the system may promote the oxygen diffusion. Further increase in temperature is helpful to the oxide ions diffusion. There is always a maximum value of oxygen diffusion coefficient, which is represented by the slope of MSD curves, corresponding to a certain amount of MgO. In MgO stabilized zirconia, the most suitable doped amount of MgO exists in a range , which is decided by the working temperature of MgO stabilized zirconia.

Abstract: By using XRD, isothermal microcalorimetry, ESEM, EDS, NMR, the effects silica fume and polycarboxylate superplasticizer (PC) on the hydration behavior of tricalcium silicate (C₃S) paste were researched. The results show that: PC suppresses the hydration of C₃S while silica fume promotes the hydration of C₃S by consumption of generated Ca(OH)₂. Both PC and silica fume change the morphology of hydration products C-S-H gel from needle-bar-like to reunion-like, along with the polymerization state of silicon-oxygen tetrahedron varied greatly. Especially silica fume significantly affects Q¹, Q² percentage of silicon-oxygen tetrahedron.

Abstract: Formula for glass fiber/microcellular unsaturated polyester composites (GF/MCUP) using supersaturated gas technology was studied by the way of orthogonal experiment. The results showed that these factors affecting average cell size from strongly to weakly were styrene content, accelerant content, glass fiber length, curing agent and glass fiber content, respectively. The factors affecting average cell density from strongly to weakly were accelerant content, styrene content, glass fiber content, curing agent content and glass fiber length, respectively. Curing agent content was the major factor affecting impact strength of GF/MCUP. The factors revealed no obvious difference in affecting tensile strength. Under the optimizing processing condition, the average cell size of GF/MCUP was about 8 μm and the cell density was 1.19×10⁹ cells/cm³. The 153.70 and 255.84 % increase in impact strength were gained over that of GF/UP and UP, respectively. The corresponding 20.24 and 82.51% increase in tensile strength-to-weight ratio were gained over that of GF/UP and UP, respectively.