Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract The ease with which plasticizer is combined with poly(vinyl chloride) resin is a measure of processing characteristics critical in the dry blending of suspension PVC and the gelation of plastisols. By using commercial grade plasticizers, this study developed predictive equations for the following processing p…
The effect of soil clay size phyllosilicates, particle size, and iron oxides on the activities of α‐ and β‐glucosidases, phosphomonoesterases, and urease were examined. The two clay fractions (0.2–2 and <0.2 μm) of selected soils had similar mineralogy and were illitic, kaolinitic, and smectitic in composition. In gen…
Eingebettet in einer schützenden äußeren [{Fe(pz3)}4]-Schale, die ihm Strukturstabilität verleiht, enthält der achtkernige Komplex [Fe8(μ4-O)4(μ-pz)12Cl4] einen cubanartigen Fe4O4-Kern (siehe Bild), der reversibel in vier aufeinanderfolgenden Ein-Elektronen-Übertragungen reduziert werden kann. Es wird gezeigt, daß Eis…
Iron enriched in the isotope 57Fe was dispersed in a nanocrystalline tungsten matrix by mechanical alloying. Mössbauer experiments were performed using as-milled, isochronally and isothermally annealed samples, both at room temperature and as a function of measurement temperature. The spectra were interpreted in terms…
The experimental results of an investigation of the surface morphology of the as-grown (100) faces of KDP single crystals grown on seeds from aqueous solutions containing different concentrations of Fe3+ and Cr3+ impurities are described and discussed. It was found that the behaviour of steps in terms of their mutual…
Abstract Blends of polystyrene and polyethylene (PS/PE), including belnds in which a styrene/ethylene‐butylene/styrene (SEBS) terpolymer was employed as a compatibilizer, were studied. Their rheology showed that the effect of the addition of SEBS to PS/PE blends was strongly affected by the blend composition and the s…
The reflective cholesteric texture mode between planar and homeotropic textures, which can achieve a high contrast ratio, needs to be coupled with an active matrix drive scheme such as a method using thin film transistors. In this article, the threshold voltage of the cholesteric–nematic phase transition, an important…
Banana-shaped compounds form several new smectogenic phases specific to this class. Several two-dimensional phases have been observed, and these can exhibit very complex and beautiful optical textures (see Figure). These phases are reviewed and their structures investigated by not only X-ray diffraction and nuclear ma…
A third crystalline modification of dodecaphenylporphyrin is described in which the pyrrole nitrogen atoms are hydrogen-bonded to two ethanol molecules. This is the first crystallographic proof for the accessibility of nitrogen atoms in saddle-distorted free base porphyrins for hydrogen bonding. No such coordination i…
Studies have been carried out to convert carpet waste into valued products. Two common processes, injection and compression molding, can be used to recycle carpet waste. Three types of carpet waste have been recycled: (1) edge trim from carpet manufacturing, (2) polypropylene shear lint from cutting tufted carpet loop…
Material evolution laws, such as those implicit in theories of plasticity and growth, are subjected to a systematic treatment. Using some concepts borrowed from the theory of inhomogeneities, the evolution of the material structure for materials of first and second order is expressed in terms of first-order differenti…
Thermal diffusivity of AlN‐based ceramics was studied as a function of second‐phase amount and heat‐treatment time. The Y 2 O 3 ·Al 2 O 3 contents varied over the range of 13‐31 vol%. The thermal diffusivity decreased as the amount of second phase increased. After sintering at 1850°C, the AlN ceramics consisted of rou…
Transparent PLZT(7/60/40) ceramics with large piezoelectric coefficients were obtained using a two‐step sintering process with controlled oxygen partial pressure. Specifically, low‐oxygen‐pressure and low‐temperature sintering were used in the first step, followed by a high‐oxygen‐pressure, high‐temperature sintering…
Abstract This work is concerned with determining how to effectively recycle wholly thermoplastic composites comprised of a polypropylene (PP) matrix reinforced with a thermotropic liquid crystalline polymer (TLCP). A novel reclamation process was developed in which the TLCP could be recovered from the PP matrix. React…
Magnetic and electrical transport properties of ${\mathrm{SmNi}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{\mathrm{O}}_{3}$ perovskites, with $0<~x<~1,$ have been studied in the temperature range $5<~T<~700\mathrm{K}.$ This series shows paramagnetic metal, paramagnetic insulator, antiferromagnetic insulator, and…
A stretching device suitable for fitting within a deuterium nuclear magnetic resonance (NMR) probe was constructed to investigate the large strain uniaxial tensile deformation behavior of nylon 6 plasticized by 40 wt % of phenol- d 5 . The phenol- d 5 molecules probe the environment of the amorphous regions in nylon 6…
The hydrolysis and transesterification of RNA are catalyzed by a variety of metal ions, metal complexes, metalloenzymes, and ribozymes. These reactions are of fundamental biochemical importance. However, the role that metal ions play in RNA hydrolysis is not completely understood. We previously showed that aqueous Cu(…
The influence of morphology on the electrical properties of syndiotactic polypropylene (sPP) has been investigated in comparison with those of conventional isotactic polypropylene (iPP). The evolution of spherulite in sPP occurred at a lower temperature than in iPP, and the size of spherulites in sPP is much smaller t…
Abstract The finest fractions of Upper Jurassic shales from the North Sea and onshore Denmark contain 80–90% of an illite-smectite-vermiculite (I-S-V) mixed-layer mineral and, in addition a phase which has X-ray diffraction (XRD) peaks at 7.20–7.26 Å and 3.56–3.58 Å in air- dried and glycolated specimens. This phase m…
The use of classic anticorrosive pigments is becoming more and more restricted by increasing environmental concerns; they are gradually being replaced by zinc phosphate and related compounds. Other anticorrosive pigments such as surface-exchanged silicas were also proposed. The object of this research is to study the…