Advanced Materials Research Vols. 641-642

Abstract: In this paper, by analysizing relevant theory and properties of ecological building materials, eco-materials in architectural design strategy, for example, the practical application of the material in the Expo building which can explore the intrinsic link between ecological materials, architectural design and environmental resources.

Abstract: Abstract. Samples of Al₂O₃-C materials were prepared, based on the tabular corundum and recycled materials as raw materials, natural graphite as carbon source, Si as antioxidant and phenolic resin as binder. The physical properties were determined and the microstructure evolution in the samples were analyzed by scanning electron microscopy. The results shows that, Firstly the apparent porosity rate change little and the body density decreases much with the amount of recycled materials increasing. Secondly the room temperature strength and the high temperature strength decreases when the amount of recycled materials increases. Especially the strength of sample decreases rapidly when the amount of recycled materials is over 15(wt)%. In addition, the grain of recycled materials are wrapped up in the face by a powder layer. The body density and the strength of samples decrease because of the apparent porosity.

Abstract: A novel supramolecular smart poly(N-isopropylacrylamide-co-tetra(5-hexenyloxy)-p- tert-butylcalix[4]arene) (P(NIPAAm-co-Calix)) hydrogel was synthesized by free radical polymerization of N-isopropylacrylamine(NIPAAm) and modified calix[4]arene. The swelling behaviours and ionic adsorption capacity were studied. It is found that the polymeric network of the P(NIPAAm-co-Calix) hydrogel is characterized by an open structure with more pores and higher swelling ratio compared to the PNIPAAm hydrogel. The adsorption abilities of heavy toxic metal ions (Ni2+, Cu2+, Pb2+, Cd2+) for P(NIPAAm-co-Calix) hydrogels and PNIPAAm hydrogel were different and depend on the temperature. This could provide a theoretical basis for the intelligent response mechanism to stimulate research of supramolecular hydrogel.

Abstract: Fiber- reinforced composites have been applied extensively not only in aero-space, automobile and other industries, but also in sports instruments. The application of fiber- reinforced composites for sports instruments is introduced. The advantage of fiber rein-forced composites, materials selection, products varieties, examples and status of application for sports instruments are discussed.

Abstract: In order to further study the aging properties of high temperature vulcanization (HTV) silicone rubber for composite insulator in the high-altitude region, tests of outdoor electric aging and ultraviolet accelerated aging have been carried out in the paper. The contact angles test, scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR) were used to study the microscopic physical properties of samples after the aging tests. SEM observed that the surface flatness of samples declined, holes and particles increased on the sample surface, a large number of fillers exposed. The results of FTIR showed that Si-C bonds in the side chain in Si-O backbones were broken by ultraviolet radiation and methyl groups were oxidized, a small amount of fire retardant (Al2O3•3H2O) were decomposed, hydrophilic groups increased, all which have happened on the HTV silicone rubber after both the aging tests under the same ultraviolet radiation. The differences between the aging properties of two kinds of tests are that the aging extent of samples after outdoor electric aging was severer than that in ultraviolet accelerated aging, and the surface hydrophobicity of it after outdoor electric aging increased compared to ultraviolet accelerated aging. The aging of HTV silicone rubber for composite insulator is mainly caused by strong ultraviolet radiation in high-altitude region.

Abstract: Aiming at the camber problem caused by plate mill’s stiffness difference, this paper put forwards an online compensation method for plate mill’s stiffness difference. Based on the detective actual rolling force in the rolling process, calculate the spring of plate mill’s driving side and non-driving side to get the gap compensation value of plate mill’s stiffness difference. Via plate mill AGC system adjust the two sides’ gap difference online, eliminate additional spring caused by plate mill’s stiffness difference. Online algorithm of plate mill’s stiffness difference embeds in basic automation directly. With the going on of rolling process, update the compensation values constantly according to the changes of rolling force in order to increase the stability and decrease plate camber in the rolling process.

Abstract: Nine groups of cement mortar with different mix proportion were designed to measure their fluidity 0h, 0.25h, 0.5h, 0.75h and 1h later, compressive strength and rupture strength of 3d, 7d and 28d were also tested to find out the relationship between compressive strength, rupture strength, water-cement ratio and sand-cement ratio by software Origin. Considered the three factors above, the optimum mixture ratio was determined finally to meet the requirements.

Abstract: Abstract: Appropriate ratio of mixing digestion solvent which consist of HF and HNO3 have been tested firstly and combine with the high-pressure sealed microwave heating method, the titanium ore samples can be quickly and completely digested into solution. Then the elements content of zirconium, niobium, vanadium, chromium can be determined at the same time by applying the inductively coupled plasma atomic emission spectrometry (ICP-OES) method under hydrofluoric acid media condition.This method has solved the problem that the titanium ore matrix and impurities of zirconium oxide, niobium oxide, chromium oxide and other insoluble oxides are all difficult to digeste under normal conditions by the acid. Through fluoride ion complex reaction, make sure the easy hydrolysis of titanium ore matrix and niobium, zirconium and other elements to form the shape of the complex ion, even in the low acidity of the solution does not produce the hydrolysis reaction, so that it can greatly reduce the detection solution acidity to eliminate the blank background and acidity effects. The experiments investigated the impacts between the sample digestion conditions such as microwave heating procedures, reagents ratio, amount, and the titanium matrix as well as coexistent elements. Besides, it optimized the detection parameters of the ICP spectrometer under the conditions of using unconventional resistance to hydrofluoric acid PTFE nebulizer. Spectral interferences and matrix effects have been eliminated by selecting the appropriate analyte spectral lines as well as the integrated use of matrix matching and synchronization of the background correction method. The results show that the background equivalent concentration is 0.0002% ～ 0.0008%, and the detection limit is 0.0029 ～ 0.0018%, trace element recovery rate is 91.0% and ～108.0%, RSD is ≤ 4.71%.

Abstract: A lot of foaming agents are used during the mining mineral processing. The foaming agent is hard to degrade and remains in the wastewater and chemical oxygen demand (COD) is far exceeded the standard in mine water. In this paper, the component of foaming agent made in Guangxi province was determined and analyzed through experiments. At the same time, the effect and the contribution of foaming agent to the COD materials in the water were also been studied. The degradation performances of foaming agent in different conditions such as pH, initial density and temperature, with aeration or without aeration, with ultraviolet ray or without ultraviolet ray were studied particularly. The result of this study provided the scientific basis in choosing the appropriate new environmental foaming agent and reduced the content of COD in the flotation wastewater.

Abstract: Nanocomposite foams based-on ethylene octene copolymer (POE)/ethylene vinyl acetate (EVA) copolymer were prepared by melting of POE/EVA with organic montmorillonite (OMMT) by pressurized curing at high temperature. The cellular microstructure of the foamed samples was observed by scanning electron microscope. The effects of OMMT on the cellular structure and mechanical properties of the POE/EVA/OMMT nanocomposite foams were investigated. It was found that OMMT played an important role in affecting the microstructure. Comparing with POE/EVA foam the nanocomposite foams with the addition of 1-3 phr OMMT showed smaller cell size and the structure uniformity of foams was improved. The density of POE/EVA/OMMT nanocomposite samples was lower obviously, meanwhile the mechanical properties of the foamed samples was enhanced.