Materials Literature
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57Fe transmission Mössbauer spectroscopy and X-ray diffraction measurements are performed on icosahedral quasicrystals. Magnetic and electronic properties including lattice vibrational states are studied and compared for Al–Cu–Fe– and Fe-doped Al–Cu–Ge–Mn–type quasicrystalline alloys. In the latter, magnetic long-rang…
Abstract This article describes the physical principles of brazing with illustrations and details elements of the brazing process. The elements of brazing process include filler-metal flow, base-metal characteristics, filler-metal characteristics, surface preparation, joint design and clearance, temperature and time,…
無水コハク酸と各種オキシランとの開環共重合を3種類の触媒にて行い, 得られた共重合体の特性, 特に生分解性について調べた. 無水コハク酸とオキシランとの交互共重合体であるポリエステルの分子量 (Mn) は10000から20000であった. オキシランを過剰に用いた場合には, 分子量は1OOO0から50000のコポリエステルエーテルが得られた. アルミニウムトリイソプロポキシドの場合には, モノマー仕込比に関係なく交互共重合体が得られた. またジエチル亜鉛では, ランダムコポリマーが得られた. リパーゼによる加水分解より, プロピレンオキシドとの共重合体の分解性が最も優れ続いてエチレンオキシド, アリルグリシジルエーテルとの共重合体…
Application of X-ray photoelectron spectroscopy (XPS) to corrosion science was introduced in both qualitative and semiquantitative aspects. In particular, abilities and limitations as a surface analytical technique were explained with practical examples.
Abstract In the presence of excess hydrogen peroxide and formic acid the latex stage epoxidation of natural rubber is pseudo–first order in nature. A kinetic model is developed to predict the maximum extent of epoxidation for the reaction system and its variation with increasing acid concentration. Th dependence of th…
Raman spectra of carbon overcoats of simulated hard magnetic storage discs were obtained for different conditions of deposition by argon ion-induced sputtering. Both an increase of substrate temperature and of argon ion pressure improved the spectral resolution of the two major Raman peaks, one at 1360 cm-1 (the so-ca…
Diffusion coefficients and solubilities of hydrogen in grain-refined aluminum have been measured by a vacuum hot extraction method. Four samples with different grain sizes are prepared by melting, addition of Ti and B, casting, remelting and unidirectional solidification. Grain-refined samples contain some small parti…
Single crystals of β-CuZn have been deformed in direct shear in a wide range of temperatures in different shear systems. The shear systems studied were ⟨111⟩-{112}, ⟨111⟩-{110},⟨100⟩-{100}, ⟨100⟩-{110}, ⟨110⟩-{100} and ⟨110⟩-{110} systems. In the case of the ⟨111⟩-{112} shear system the crystals were deformed in both…
The microstructural changes during sintering of Ni–Zn ferrites used as the substrate for thin film magnetic recording heads have been studied by SEM, XRD and XPS. Any precipitates were not observed in the specimen air-sintered and furnace-cooled from 1423 K. ZnO precipitates, however, were observed at the grain bounda…
Some features of the experimental hair-length distributions obtained when yarn hairiness is measured by means of the Zweigle G 565 apparatus are described. Tests were made on a population of 85 yarns from different fibres and blends and various spinning processes. It is found fundamentally that the distribution seems…
In the absence of any templates, large single crystals of mordenite have been hydrothermally synthesized from clear homogeneous solutions, by using both Aerosil and sodium silicate as silicon source.
Abstract FT‐IR and Raman spectra of ammonium hydrogen tartrate [NH 4 HC 4 H 4 O 6 ] and potassium hydrogen tartrate [KHC 4 H 4 O 6 ] have been measured. Vibrational assignments have been made for both the internal and external vibrations. Because of the free rotation of the NH 4 + ion, it forms only weak hydrogen bond…
The interfacial tension between a liquid Cu-Bi or Cu-Pb alloy and solid Cu was measured by using multiphase equilibria. The results are summarized as follows:(1) The surface tension of solid Cu coexisting with the liquid Cu-Bi or Cu-Pb alloy is significantly lower than that of pure solid Cu, becase Bi or Pb vapor atom…
Hennomartinite, SrMn 2 3+ [Si 2 O 7 ](OH) 2 . H 2 O, is an orthorhombic (Cmcm, a = 6,245[1], b = 9.031[2]. c = 13,404[2] A, V = 756.0[1] A 3 , Z = 4) disilicate of the lawsonite structure type which occurs as anhedral poikiloblasts up to 1 mm, strongly intergrown with sugilite and serandite-pectolite. The mineral is t…
Cationic (LEWATIT S100) and anionic ion exchangers (LEWATIT M500MB) were thermally decomposed in amounts of 15–60 μg in a foil pulse pyrolyzer. The gaseous products were gas-chromatographically separated and identified by mass spectrometry. Cationic resins release mainly sulfur dioxide and benzene at temperatures up t…
Abstract A series of new polyamides and copolyamides containing aromatic sulfone ether linkages was synthesized from 4,4′‐[sulfonyl‐bis(4,1‐phenyleneoxy‐3‐pentadecyl)]bisphenylamine (SPPBA) and isophthaloyl chloride (IPC), terephthaloyl chloride (TPC), bis(4‐chlorocarbonylphenyl)dimethylsilane (DMSC) and bis(4‐chloroc…
Abstract The synthesis of functionalized unsymmetrically substituted tetrathiafulvalenes 1, 2 and 3, 4 (see scheme in the introduction) was described. Two routes were used. A cross‐coupling preparation from appropriate 1,3‐dithiolium salts which offered poor yields and a WITTIG‐HORNER type reaction which was studied i…
Abstract A series of cellulose–polysilicic acid hybrid fibres with 15–35% silica contents were spun and their flammabilities were assessed by the LOI oxygen index test. Also, the rate of heat release and toxicities of fumes evolved during the combustion process for hybrid fibre with 33% SiO 2 loading was obtained usin…
The continuum equations of Leslie et al. [1] for smectic C, and the extension of this theory for chiral smectic C* [2], are applied to problems involving simple planar layer configurations which accommodate uniform layer thickness constraints. The chiral smectic C*M and non-chiral smectic CM [3] are considered as eith…
The use of ozone depleting, so-called hard CFCs as blowing agents for rigid PU foams is presently experiencing considerable political and legislative pressure, to such an extent that a complete ban of these substances is expected within the foreseeable future. Consequently, there exists an urgent need for new thermal…