Materials Literature
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Abstract The porous structure was prepared with polyether ether ketone (PEEK) and polyphenylene sulfide (PPS), which had excellent solvent resistance and thermal resistance as the mixed polymers, and diphenyl ketone as the diluent. The possibility of forming porous structure and the control of porous structure were in…
Abstract Graft copolymers of chitosan and vinyl acetate were synthesized by free radical technique using cerium (IV) as the initiator. Under controlled conditions, as much as 92% grafting with a grafting yield of 30–40% could be achieved. Chitosan‐ g ‐poly(vinyl alcohol) copolymers were derived by the alkaline hydroly…
Abstract The tensile properties of polypropylene (PP) filled with hollow glass beads have been measured at room temperature to identify the effects of the particle contents, size and its distribution on them in the present article. The mean diameters of the fillers were 11, 35, and 70 μm, and they were named as TK10,…
The variation of composition and chemical bonding structures of the nanocrystalline diamond (ND) films induced by nitrogen incorporation in CH4(10%)∕H2∕N2 plasmas was investigated by x-ray photoelectron spectroscopy. The sp2∕sp3 phase ratio of hybridized carbon bonds in ND films was shown to depend strongly on the nit…
We have measured the resistivity of the organic conductor TTF-TCNQ under high pressure up to 8.0 GPa using a cubic anvil apparatus. Below 3 GPa, the pressure dependence of the charge-density-wave (CDW) transition temperature, T CDW , is consistent with previous results, except for the observation of the "49 K-transiti…
Abstract Organic superhydrophobic films were prepared by utilizing TA‐N fluoroalkylate (TAN) and methyl methacrylate (MMA) copolymer as water‐repellent materials and inorganic silica powder as surface roughness material has been developed. Coating solutions prepared by adding silica powders into copolymer solution dir…
The current state of the description and evaluation of dislocation-induced X-ray diffraction line broadening has been reviewed. The diffraction-line broadening can be analyzed in terms of line width, moments or Fourier coefficients. However, in the last years, whole pattern fitting has become the most popular method o…
Synthesis protocols, structures, and reactivity of Re-oxo species grafted onto H-ZSM5, and their subsequent conversion to Re-clusters through contact with H2 or CH4 were studied by using Raman, infrared, and X-ray absorption spectroscopies. Reactivity measurements by using alkane and alkanol reactants were also examin…
Abstract The mechanical properties such as tensile behavior and impact strength of melt mixed poly(butylene terephthlate) (PBT)/acrylonitrile–butylacrylate–styrene (ABAS) terpolymer blends at ABAS contents up to 39 vol % were evaluated. Tensile properties decreased while impact strength was enhanced by the blending po…
Abstract The incorporation of fillers into elastomers has profound effects on the mechanical, physical, and thermal properties of the nanocomposites that form. In this study, styrene–butadiene rubber as a matrix was reinforced separately with 10‐, 15‐, or 23‐nm CaSO 4 , which was synthesized by an in situ deposition t…
Mn-doped AlN nanowires were synthesized by in situ doping of Mn using a chemical vapor deposition method. Analyses of microstructure and chemical compositions indicate that the as-prepared samples were homogenously Mn-doped AlN nanowires. The low temperature photoluminescence, and magnetization as a function applied m…
Abstract A reduction in the glass‐transition temperature ( T g ) was found for polyolefins chemically crosslinked by peroxide. This tendency, which was observed for low‐density and high‐density polyethylenes, was also validated for their blends with Ethylene Vinyl Acetate copolymer. It is proposed that the constrained…
Abstract The molecular weight distribution curves of several commercial polyethylene samples were evaluated by high‐temperature gel permeation chromatography with two detectors (a refractive‐index detector and a viscometer) to determine the molecular sizes and architectures (branching). The polymer samples included hi…
The results of bromine doping of transparent and conducting single wall carbon nanotube (SWNT) thin films are described. Br profoundly effects the density of states (DOS) of SWNTs which leads to dramatic improvement in the electrical properties. The authors show that the role of the Br is not only in shifting the Ferm…
Abstract The effectiveness of the reactive extrusion technique was investigated for poly(ethylene terephthalate) to promote the concept of closed‐loop recycling, that is, the reuse of waste material in the initial application. More specifically, a chain‐extender system, consisting of pyromellitic dianhydride, polyol,…
We present a new mechanism of carbon nanotube superconductivity that originates from edge states which are specific to graphene. Using on-site and boundary deformation potentials which do not cause bulk superconductivity, we obtain an appreciable transition temperature for the edge state. As a consequence, a metallic…
We study electronic inhomogeneities in manganites using simulations on a microscopic model with Coulomb interactions amongst two electronic fluids-one localized (polaronic), the other extended-and dopant ions. The long range Coulomb interactions frustrate phase separation induced by the large on site repulsion between…
Abstract Two clay compounds, montmorillonite (Cloisite 30B) and kaolinite, were dispersed in a poly( m ‐xylene adipamide) resin at loading levels of 2 wt % clay. The samples were melt‐compounded and extruded. The extruded samples were injection‐molded into preforms and then blow‐molded into multilayer bottles. Rheolog…
Transparent glass-ceramics appear to be an ideal material for advanced armour applications due to their relatively good transparency, low density, relatively high fracture strength and chemical stability. The ballistic (low impact velocity) impact resitance of novel transparent glass-ceramics has been investigated. It…
Up-conversion emission and confocal fluorescence imaging of Er3+-doped CaF2 nanocrystals were investigated using infrared excitation. At Er3+ concentrations less than 2.8mol%, green emission was dominant while red prevailed at higher concentrations. The simultaneous green and red emission and change in relative intens…