Advanced Materials Research Vols. 581-582

Abstract: Stress intensity factor of thermal fatigue crack was calculated within one cycle by using finite element method in consideration of the multi-linear kinematic hardening characteristic of a material. The affection of loading sequence to stress intensity factor was studied under circularly variational temperature by comparing to that in one cycle. The low temperature cycle can not affect the stress intensity factor of latter cycles with high temperature; but high temperature cycle can affect the stress intensity factor of latter cycles with low temperature, and make it be equal to that of the high temperature cycle.

Abstract: The ion-exchanger Mg0.5Ti1.25O3 was prepared by a solid state reaction crystallization method. The extraction/insertion reaction with this material was investigation by X-ray, saturation capacity of exchange, and Kd measurement. The acid treatments of Mg0.5Ti1.25O3 caused Mg2+ extractions of more than 72%, while the dissolutions of Ti4+ were less than 7.1%. The experimental results have proved that the acid-treated sample has a capacity of exchange 5.4mmol•g-1 for Li+ in the solution.

Abstract: Bentonite has better heavy metallic ion adsorption capacity than most of other minerals. But bentonite suspension is stalbe and it makes the solid-liquid separation very difficult. To solve this problem, bentonite was fixed into the resin by copolymerizing with acrylic acid. The reaction mechanism and the effect of bentonite on the properties of the resin were studied. The results show that the addition of bentonite has similar effect on the water-absorption and Cu2+ adsorption properties of the resin. When the mass ratio of bentonite to acrylic acid is below 1∶2, the addition of bentonite improve the water absorption and Cu2+ adsorption properties, and the water absorption and Cu2+ adsorption properties decline with more bentonite added.

Abstract: The impurities and gas-liquid inclusions in quartz sand, which are from our country and UNIMIN Corporation respectively, were analyzed by Inductive Coupling Plasma Emission Spectrograph（ICP-AES）and Fourier Transform Infrared Spectroscopy (FT-IR). The results showed that the biggest difference between them was the content of gas-liquid inclusions. Thus, in order to improve the quality of our country high purity quartz sand, development of new technology to remove gas-liquid inclusions has been imperative. Method for removal of gas-liquid inclusions, using microwave radiation, was studied in this project. Meanwhile, the change of microscopic morphology of gas-liquid inclusion was observed by polarizing microscope. And the change of water content in gas-liquid inclusion was investigated by Fourier Transform Infrared Spectroscopy. Our results showed that micro-crack could be produced on the surface of gas-liquid inclusion under microwave treatment. The results also showed that new water molecules and liquid inclusions could be generated in the process. Furthermore, these liquid inclusions could be removed and H2O could be reduced by HF acid leaching.

Abstract: In order to evaluate the feasibility of tritium recovery from tritiated water by thermochemical decomposition using ZrNi5, the kinetics of reaction between ZrNi5 and water vapor was studied by thermogravimetric method in the temperature range from 673K to 823K. The result shows that reaction rate increased significantly with the increasing of temperature and H2O concentration; the reaction mechanism for ZrNi5 can be described by the first-order chemical reaction, and the reaction is first order for H2O concentration. The reaction activation energy of ZrNi5 is 55.8kJ/mol calculated from the Arrhenius equation.

Abstract: Aspartic acid hydrochloride ionic liquid ([Asp]Cl) was successfully synthesized from aspartic acid powder and 36% hydrochloric acid. The derivative of chitosan cyanoethyl chitosan was prepared by acrylonitrile and alkali chitosan at room temperature. Structures of ionic liquid and cyanoethyl chitosan were characterized by FT-IR. Crystalline properties of cyanoethyl chitosan were characterized by XRD. Cyanoethyl chitosan was dissolved in [Asp]Cl ionic liquid aqueous solution and subjected to wet spinning. The mechanical properties of cyanoethyl chitosan fibers were tested by type LLY-06 electronic single fiber strength tester, and the surface morphology of fibers were observed by microscope. The results show that the maximum breaking strength of fiber was 2.212CN/dtex when the concentration of cyanoethyl chitosan was 6.5% relativing to 3% ionic liquid and the coagulating bath temperature was 30°C.

Abstract: This paper designed 15 kinds of embedded weaving for photocatalyst fiber filament fabric. It performs testing and analysis on the fabric’s air permeability and moisture permeability, to make preliminary conclusions: with the increase in the proportion of photocatalyst fiber, the fabric’s air permeability will become better, while the case is opposite with the moisture permeability of fabric. From the structure point of view, both permeability of the 5/3 shaded satin fabrics are larger than those of 2/2 twill fabrics, which shall be larger than the plain fabrics.

Abstract: Corn fiber gum (CFG) was extracted from the corn kernel pericarp and the physical and in vitro biological properties of CFG were investigated. The average molecular weight was determined to be 249kDa by SEC-LLS. And the capacity of water solubility was 323mg/mL. Experimental results also showed that CFG possessed antioxidant and bile acid binding activities in a dose-dependent way. The results from this study suggest that CFG, besides as a potential gum arabic replacer, can be applied in various fields such as functional foods and supplemental and pharmaceutical products.

Abstract: Polyurethane elastomers (PU) based on polyester, TDI-100 and MOCA were synthesized by two step method. The polyurethane elastomers were investigated by infrared spectroscopy (FTIR), atomic force microscope (AFM) and dynamic thermal mechanical analyses (DMA). The results show that the structure of polyester plays an important role in polyurethane damping materials. When the polyester contains more side methyl groups, the polyurethane material has high damping properties (tan δ) and wide damping zones. So the polyurethane damping property can be improved by choosing polyester with appropriate structure.

Abstract: In this study, the cross-linked network structures, dynamic mechanical properties and Po、PRI of microbe coagulated natural rubber (NR) samples were analyzed. And mechanical properties of the corresponding NR vulcanizates were further determined by universal testing machines. The results show that the NR of aging resistance increased with the cycle of hanging.When hanged 14 days,the PRI and P0 were 85 and 36.6. With the cycle of hanging rising, NR raw rubber of cross-linked density increased,and had good dynamic mechanical properties as compared with that hanged 0 days.