Advanced Materials Research Vols. 399-401

Abstract: In semiconductor packaging, conventional test procedures for evaluating mechanical properties of ball bonded gold wire bonding are well established. However these tests do not provide clear understanding related to the strength mechanism leading to improper reliability data. The nanoindentation approach, uses equipment called nanoindenter, gives advances mechanical (sub-micromechanical) characterization, particularly the combination effect of elastic and plastic deformation. Wire bonding process was prepared using thermosonic-wire bonding technology with 25m diameter gold wire and copper as substrate. To obtain mechanical properties, ball-bonded was cross-sectioned diagonally before indented at various locations. Results show that mechanical properties vary according the locations throughout the surface; at the centre, at the edge and at the area near intermetallics layer. This indicates test location plays important role in determining ‘meaningful’ mechanical properties.

Abstract: In the present study, we designed a novel unsymmetrical isomeric diarylethene derivative bearing both thiophene and anthracene moieties. Its photochromic properties and fluorescence were investigated in detail. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence. The photochromic reaction kinetics indicated that the cyclization process of 1o belongs to the zeroth order reaction and the cycloreversion process belongs to the first order reaction. This new photochromic system also exhibited remarkable optical storage character.

Abstract: 3% hyperbranched polymer was incorporated into polypropylene and dyed with Disperse Blue 2BLN. The observed enhancement of dye uptake can be attributed to the introduction of polar groups. The finding that dye uptake on the modified fiber reached a maximum at 110°C suggests that “saturation” had occurred. While the washing fastness of dyed fabrics made from polypropylene fiber which had been modified with hyperbranched polymer was very good, the fastness of the dyeings to light was poor. The incorporation of 3% hyperbranched polymer into polypropylene prior to fiber spinning had no effect on the physical properties of the fiber，however markedly enhanced the dyeability of polypropylene.

Abstract: The wear property of TC4 alloy is focus of discussion for its being used in high strengthen and corrosion resistant of tubing material. In the present paper, the wear properties of TC4 alloy and G3 alloy tubing steel are investigated comparatively, the differences and similarities of the weight loss rate of wear, wear coefficient and topography of wear mark by the wear test and the topography analysis are analyzed, and then the wear mechanism is discussed. The result shows that the topography of wear mark of TC4 alloy is furrow morphology, but that of G3 alloy tubing steel is pit morphology. The wear resistant of G3 alloy tubing steel is obviously more excellent than that of TC4 alloy. The wear mechanism of TC4 alloy is exfoliation wear, adhesive wear and fatigue wear, and that of G3 alloy tubing steel is exfoliation wear and abrasive wear.

Abstract: The method of high performance liquid chromatography (HPLC) is established to determine the content of antibacterial agent — ciprofloxacin (CF) in the degradation solution of ciprofloxacin-polyurethane (CFPU) and investigate the in vitro degradation kinetics by plotting and fitting the cumulative release curves to inspect the effects of different medium and different concentrations on drug release. The results showed that the HPLC method is accurate, reliable and simple. The drug-release of CFPU was bioresponsive and could be accorded with first order kinetics. It was observed that CF was released from CFPU by a combination of diffusion and erosion mechanism, mainly in the manner of diffusion in the absence of infection while erosion mechanism in the presence of infection.

Abstract: A new type of Side-Chain Liquid-Crystalline Polysiloxanes was synthesized by graft polymerization, using (Trans, trans)- 4-propyl-4’-vinyl-bicyclohexane(3HHV) with platelet texture of a blue phase as mesogenic monomer. Microstructure of monomer and polymer were analyzed by polarizing optical microscopy and X-ray diffraction. Thermal properties of monomer and polymer were researched by differential scanning calorimetry. Meanwhile, spherulite texture of polymeric smectic A phase of liquid crystal polymer was revealed in the cooling cycle by polarizing optical microscopy, and this texture was so uncommon that can hardly be found in the liquid crystalline polymers.

Abstract: Coal/ZnAl-Layered double hydroxides (ZnAl-LDHs) composites were synthesized via a co-precipitate method using Shenfu coal as a raw material. Effect of coal on the structure, morphology and thermal properties of coal/LDHs composites were investigated by XRD, FT-IR, SEM and DSC analysis methods. The results indicated that coal provided acidic functional groups as the interlayer anion of composites, and the mineral materials in coal made the structure of composites more complicated. The morphologies and particle sizes of composites were affected by the porosity and network characteristics of coal. Although exothermic behavior of coal weakened the endothermic efficiency of ZnAl-LDHs during the degradation process, the coal char on the surface of composites formed an insulation layer, which provided a synergistic fire retardant of ZnAl-LDHs in coal spontaneous combustion.

Abstract: This thesis illustrate the effect of reusing high-temperature condensed water thermal energy and the characteristics of the methods about removing iron and oil from high-temperature condensed water , eventually propose the using of the heat-resisting NF and RO membrance system as the best choice of all methods.

Abstract: The field emission scanning electron microscope is applied in this paper to analyze the surface topography of diamond crystal synthesized at high pressure and high temperature. The research shows that parallel steps, jagged steps, hexagonal hills exist on (111) plane of diamond. The topography has a relation to the growth way of diamond. The (111) planes of diamond crystal mainly grow in layer mode.

Abstract: Surface carbamatization of cellulose fabric was accomplished through co-heating with urea. The carbamate group on textile surface was transformed to N-chlorocarbamate after exposure to sodium hypochlorite solution. Effect of carbamatization temperature, time on Nitrogen content of fabrics was investigated, and the effect of bleach technology on chlorine content on fabrics was also studied. Using shake flask method antimicrobial activities against E. coli and S. aureus were studied. The results showed that when carbamatization temperature was 138°C and the time was 3 hours, nitrogen content of cellulose fabric was the highest: 1.47%. Antibacterial ability of cellulose fabrics with 0.81mg/g chlorine against E. coli and S. aureus was 99.9999% and 100%, respectively.