Materials Literature
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Two processes are proposed for preparing anhydrous magnesium chloride by use of alcohols. Some alcohols can replace water to form coordinates with MgCl2, and make the dehydration of magnesium chloride much easler. The possibility of dehydration by alcohol distillation is discussed, and n-butanol was found to be the pr…
Labeling textile blends requires identification and quantification of their fibrous components. Blends of specialty animal fibers with sheep's wool are of special, practical importance; for these the light microscope is the traditional tool of analysis. To investigate the actual applicability of light microscopy for a…
Since its first commercial use in the early fifties naph thalene-1,5-diisocyanate (NDI) has been used almost exclusively in combina tion with polyadipate diols. The corresponding prepolymers crosslinked with 1,4-butanediol give solid NDI elastomers; crosslinking with water results in microcellular elastomers. NDI/este…
Large (NH4)H(SeO4)2 crystals and (NH4)4H22(SeO4)3 crystals grow usually from non-stoichiometric solutins with an excess of selenate acid. Complex dielectric anomalies at crystal phase transitions and suggest some kind of impurity in the crystal lattice. X-band ESR measurements of γ-irradiated single crystals identifie…
Space-time diagrams are used to analyze the dynamics of the liquid-crystal smectic C director in two-dimensional shear. We find a steady-state ring pattern only persists if there are no broken rings. A pair of defects, disclinations, is created when a ring breaks. With broken rings, the pattern dynamics is a sensitive…
Abstract Polymer gel films [poly(1‐vinyl‐2‐pyrrolidinone‐co‐ N,N ′‐methylenebisacrylamide) (PVPD)] which contain simple organic electrochromics [ p ‐diacetylbenzene ( p ‐DAB), dimethyl‐ or diethyl terephthalate ( p ‐DMP or p ‐DEP)] are prepared and their optical responses to applied voltage are investigated. p ‐DAP/PV…
Room-temperature M\"ossbauer spectra have been measured for icosahedral (i-phase) ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{20}$${\mathrm{Fe}}_{15}$ and iron-doped decagonal (T-phase) ${\mathrm{Al}}_{65}$${\mathrm{Cu}}_{15}$${\mathrm{Co}}_{20}$ quasicrystals. The observed T-phase spectrum is qualitatively different from any…
Wiring failures linked to insulation damage have drawn much attention in the aerospace industry and concerns have developed regarding the stability and safety of polyimide insulated electrical wire. Several polyimides were selected for evaluation for resistance to degradation by various aqueous alkaline solutions. The…
Ozone resistance of highly saturated nitrile rubber (HNBR) has been studied; the effect of hydrogenation progress of HNBR was evaluated at various ozone test conditions such as static, dynamic, and sequential condi tions. Dependence of its hydrogenation progress on ozone resistance is discussed by using parameters of…
The instability of antiphase boundaries (APB's) on {111} is one possible explanation for the abnormal negative temperature dependence of yield strength (TOYS) in Fe3Ge but APB tubes are found in deformed Fe3Ge which suggests that APB{111}'s are not unstable. Actual measurement of the APB energy on {111} again indicate…
Three new ternary compounds MnCuP, MnCuP 0.5 As 0.5 and MnCuAs have been prepared and characterized by X-Ray, DTA and magnetic measurements. They crystallize orthorhombically in the space group P nma (No. 62). The structures were calculated from single crystal data. The melting points were determined by DTA measuremen…
Abstract A series of end‐functionalized polymers of p‐tert ‐butoxystyrene (tBOS), with an acetoxy, an ethyl malonate, or a methacryloxy group, were synthesized by living cationic polymerization with the use of hydrogen iodide/zinc iodide (HI/ZnI 2 ) as initiating system: XCH 2 CH 2 OCH(CH 3 )‐(tBOS) n OCH 3 ( 4 ) [X:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA mechanism of sodium-catalyzed carbon dioxide gasification of carbon investigation by pulse and TPD techniquesToshimitsu Suzuki, Hiroyuki Ohme, and Yoshihisa WatanabeCite this: Energy Fuels 1992, 6, 4, 336–343Publication Date (Print):July 1, 1992Publication History Publishe…
Abstract The structure and properties of a preimidized photosensitive polyimide (Probimide PSPI, a copolyimide of benzophenonetetracarboxylic dianhydride with alkyl groups substituted aromatic diamines) were studied with variations of UV exposure energy and bake temperature by means of wide angle X‐ray diffraction, dy…
The surface of gallium arsenide has been bombarded with low energy fluorine ions in order to study their role in modifying the surface during a CHF3 reactive ion etch of oxide overlayers on GaAs. Compositional changes caused by the bombardment of GaAs with ions ranging in energy from 10 to 300 eV have been investigate…
Selective Catalytic Reduction (SCR) and oxidation catalyst technology have been applied to a stationary diesel and dual-fuel (natural gas and #2 diesel) engine for catalytic control of nitrogen oxides (NOx), carbon monoxide (CO), and nonmethane hydrocarbon (NMHC) emissions. At rated conditions, NOx emissions have been…
Some physical parameters of comb-shaped ferroelectric liquid-crystalline polymers were measured. Their rotational viscosities are two or three orders of magnitude larger than that of low molecular weight ferroelectric liquid crystals. Furthermore, they are found generally to be proportional to the second power of the…
Abstract Beim Erhitzen von Vanadium(V)‐oxid mit Rubidiumiodid auf ca. 500°C wird Vanadium partiell reduziert, es entsteht Rb 2 V 3 O 8 . Dieses kristallisiert in der Fresnoit‐Struktur. Kristalldaten: a = 892,29(7), c = 554,49(9) pm bei 20°C, tetragonal, Raumgruppe P4bm, Z = 2. Röntgenstrukturbestimmung mit 620 beobach…
Abstract IR-transmission spectra of 95TeO2·5Fe2O3 glass piece show a gradual decrease in the transmittance due to the crystallization initiating at the surface and spreading to the bulk. XRD, IR absorption spectra, and 57Fe-Mössbauer spectra show the formation of paratellurite (α-TeO2) and iron tellurite in the glass…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT(Pyridinylmethylidene)dithioles: synthesis, structure, and reactivityKevin T. Potts, Susan A. Nye, and Kennith A. SmithCite this: J. Org. Chem. 1992, 57, 14, 3895–3901Publication Date (Print):July 1, 1992Publication History Published online1 May 2002Published inissue 1 July…