Polarization Effects in Polyimides
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Stability and Chemical Form of Iodine Sorbed on Silver-Exchanged Zeolite X
Neutron activation technique was used to measure the amounts of I, Ag and Na elements in zeolite samples. The samples were nonradioactive before the activation analysis; this facilitated various operations to investigate the chemical form of the sorbed iodine. It was found that the Ag+ ions positioned in three types o…
A novel organic photochromic
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel organic photochromicS. D. Cox, C. W. Dirk, F. Moraes, D. E. Wellman, Fred Wudl, M. Soltis, and C. StrouseCite this: J. Am. Chem. Soc. 1984, 106, 23, 7131–7133Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue 1 No…
Thermal and Age-Resistance Properties of NR Gum Vulcanizates in EV Systems
Abstract A comparative study of the cure behavior of thiocarbamyl sulfenamides both in the presence of MBTS and thiazole sulfenamides has been made at 140 and 170°C. It is observed that most of the NR vulcanizates obtained at 170°C are capable of retaining a considerable portion of torque, modulus, and tensile values…
Structural studies on molecular complexes of polyethers, 3. Urea‐polyether complexes
Abstract Complexes of urea with polyethers, \documentclass{article}\pagestyle{empty}\begin{document}$\rlap{‐‐} [\left( {{\rm CH}_2 } \right)_m {\rm O\rlap{‐‐} ]}_n$\end{document} ( m = 2–4, 6, 8–10), were prepared, and their crystal structures and decomposition temperatu…
Chemical alloying, a novel method for the preparation of homogeneous selenium-tellurium (SexTe1-x) alloys
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical alloying, a novel method for the preparation of homogeneous selenium-tellurium (SexTe1-x) alloysThomas W. Smith, Steven D. Smith, and Santokh S. BadeshaCite this: J. Am. Chem. Soc. 1984, 106, 23, 7247–7248Publication Date (Print):November 1, 1984Publication History…
Improved Surface Voltage Uniformity on Electrets Obtained by Modified Corona Charging Method
The common corona charger consisting of wire or needle, gnrd, and one side metalized sample has been modified to obtain a more uniform surface potential over the area of interest. The better uniformity is obtained by adding an aperture between grid and sample close to the surface to be charged. This aperture is connec…
Low-temperature a.c. conductivity of vanadium dioxide crystals
The dielectric constant ε′(ω) and the a.c. conductivity σ(ω) of undoped and lightly doped (0·5% Al, 0·8% Ti, 0·5% W) crystals of vanadium dioxide (VO2) are reported for the temperature range 4·2–77 K and the frequency range 0·1–100 kHz. The 0·5% W-doped sample shows a strong dispersion in ε′(ω) and a frequency-indepen…
Stress-induced magnetization changes of steel pipes--Laboratory tests, Part II
Magnetometer surveys above gas pipelines have shown stress-induced magnetic anomalies at pipe bends. This suggests a technique for noninvasive monitoring of stress in pipelines and other ferromagnetic structures. Previous laboratory measurements of the external magnetic field changes due to single bending and internal…
Synthèse de dérivés du tétrathiafulvalène à propriétés mésomorphogènes
Abstract Nous décrivons la synthèse de bis (alkyl‐4 phényl) et bis (alkoxy‐4 phényl) tétrathiafulvalènes originaux. Certains d'entre eux présentent un polymorphisme dont on a précisé les températures de transition.
Effect of Solidification Mode and Impurities on Pitting Corrosion in AISI 316 GTA Welds
Pitting resistance was evaluated in autogenous GTA welds of approximately 30 commercial and laboratory heats of AISI 316 steel sheets by the standard ferric chloride immersion test and the potentiodynamic anodic polarization test in acid chloride solution. The results indicate that the solidification mode, although it…
Effect of Oxygen Partial Pressure on Oxidation of Iron at 573 K
The oxidation of iron was investigated by Rutherford backscattering spectroscopy at 573 K under the oxygen partial pressure from 10−1 to 105 Pa for 3~24 h. In the first stage of oxidation, thickness of the oxide film reached the maximum around 1 Pa. In the second stage the oxidation obeyed the parabolic rate law. From…
Reflection and Photoconduction Spectra of the Single Crystals of Perylene-TCNQ 1:1 and 3:1 Molecular Complexes
Abstract Crystal absorption spectra of the two modifications of the perylene-TCNQ (7,7,8,8-tetracyanoquinodimethan) complex were derived from reflection spectra by the Kramers-Kronig transformation and are discussed in relation to the differences in the crystal structures. The spectral response of photoconduction does…
Spectroscopic Study of the Crystal Field Splittings in TbPO4
Abstract The optical absorption and emission spectra of Tb 3+ in TbPO 4 in its tetragonal structure above 2.3 K are studied to obtain the energies, symmetry types, and wave functions of mainly the lowest crystal field components of the ground term 7 F 6 . Crystal field parameters are evaluated and used to calculate th…
Polyurethane interpenetrating polymer networks (IPN's) synthesized under high pressure. 3. Morphology and Tg behavior of polyurethane-polystyrene semi-IPN's and linear blends
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyurethane interpenetrating polymer networks (IPN's) synthesized under high pressure. 3. Morphology and Tg behavior of polyurethane-polystyrene semi-IPN's and linear blendsDoo Sung Lee and Sung Chul KimCite this: Macromolecules 1984, 17, 11, 2222–2227Publication Date (Prin…
Mechanism of electrochemical reduction of the (5,10,15,20-tetraphenylporphinato)dihydroxophosphorus(V)cation
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of electrochemical reduction of the (5,10,15,20-tetraphenylporphinato)dihydroxophosphorus(V)cationCarl A. Marrese and Carl J. CarranoCite this: Inorg. Chem. 1984, 23, 24, 3961–3968Publication Date (Print):November 1, 1984Publication History Published online1 May 20…
Effect of particle stimulated nucleation on orientation of recrystallized grains
An Al-6 wt-%Ni alloy containing a volume fraction of 0.1 of 1.1 μm dia. particles was deformed 95% by cold rolling and annealed. Recrystallization was nucleated in the vicinity of the particles, and the orientation of the new grains was investigated by X-ray and electron diffraction. The orientation of the recrystalli…
Network structure in bisphthalonitrile polymers
Bisphthalonitrile monomers were cured neat, with nucleophilic and redox coreactants, or in combination with a monofunctional model compound. Dynamic mechanical measurements on the resulting polymers from −150°C to +300°C turn up several differences attributable to differences in network structure. Rheovibron results w…
Experimental Results from Hydrogen/Deuterium Distillations at the Tritium Systems Test Assembly
Fundamental operating parameters and column performance have been measured on the interlinked, four-column cryogenic distillation system at the Tritium Systems Test Assembly. Using mixtures of hydrogen and deuterium, data have been gathered and are given here on liquid holdup in the column packing and liquid level in…
Temperature dependence of the quantum yields for the photoanation of Ru(bpy)2L22+ complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of the quantum yields for the photoanation of Ru(bpy)2L22+ complexesDavid V. Pinnick and Bill DurhamCite this: Inorg. Chem. 1984, 23, 24, 3841–3842Publication Date (Print):November 1, 1984Publication History Published online1 May 2002Published inissue…