Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational Energies and the Random-Coil Configuration of Poly(oxypropylene)Akihiro Abe, Tsuneo Hirano, and Teiji TsurutaCite this: Macromolecules 1979, 12, 6, 1092–1100Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissu…
Abstract 1 H‐NMR spectra of polyisoprene were assigned using polymers of isoprene‐1,1,4,4‐ d 4 , isoprene‐1,1,5,5,5‐ d 5 , and isoprene‐4,4‐ d 2 polymerized with various catalysts. The methylene‐proton signal at 2.1 ppm in cis ‐1,4 ‐ and trans ‐1,4‐polyisoprenes was divided into H 4 ‐ and H 1 ‐proton signals; H 4 reso…
Abstract The filler particles in most filled polymers are not perfectly dispersed but are more or less agglomerated. The degree of agglomeration and the strength of the agglomerates, which can be modified by surface treatments, have a very great effect on the dynamic mechanical properties. Filler agglomerates which ar…
Fe-B and Fe-P amorphous alloys exhibit Invar characteristics in a wide temperature range below the Curie temperature, as well as a large high-field susceptibility and a pronounced forced volume magnetostriction. It should be noted that magnetic moment per Fe atom of these alloys does not increase monotonically with de…
Electrochemical processes involving gaseous reactants can be carried out in fixed bed electrodes with co‐current downward flow of gas and electrolyte solution. Bench scale experiments with the electroreduction of oxygen, the electroreduction of sulfur dioxide, and the electrowinning of copper in such "trickle bed" ele…
The peculiar magnetic properties of the ferromagnetic compound ThCo5 have been studied by means of polarized neutrons. The first order magnetic transition, induced below 150 K by an applied field corresponds to an increase of the magnetization of the two Co sites (2c, 3g). The thermal variations of the spontaneous mag…
Temperature dependence of the lattice parameters of magnetite in cubic and monoclinic phases were measured accurately between 80 K and 295 K by means of single crystal X-ray diffraction. It was shown that the monoclinic distortion of the lattice in the low temperature phase has a tendency to become large with the lowe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, spectroscopic properties, and crystal structures of Te6(AsF6)4.2AsF3 and Te6(AsF6)4.2SO2: a new trigonal-prismatic cluster cation, hexatellurium(4+)Robert C. Burns, Ronald J. Gillespie, Woon-Chung Luk, and David R. SlimCite this: Inorg. Chem. 1979, 18, 11, 3086–…
The elementary phenomenon involved in flashover of high voltage insulators is the propagation of a discharge at the surface of an electrolyte. The study reveals two requirements: 1-Electrical conditions (applied voltage and discharge current) have to be fulfilled so that the discharge can be sustained by the power sou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomogeneous carbon monoxide hydrogenation on multiple sites: a dissociative pathway to oxygenatesJohn S. Bradley, G. B. Ansell, and E. W. HillCite this: J. Am. Chem. Soc. 1979, 101, 24, 7417–7419Publication Date (Print):November 1, 1979Publication History Published online1 M…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoresponsive Polymers. Reversible Solution Viscosity Change of Poly(methyl methacrylate) Having Spirobenzopyran Side GroupsMasahiro Irie, Akira Menju, and Koichiro HayashiCite this: Macromolecules 1979, 12, 6, 1176–1180Publication Date (Print):November 1, 1979Publication…
Abstract A series of Polyether‐based thermoplastic polyurethanes, varying in hard‐segment content between 20 and 80 wt. %, was prepared using an (oxypropylene‐oxyethylene) diol of M n = 2000 as the soft segment and 4,4′‐diphenylmethane diisocyanate extended with 1,4‐butanediol as the hard segment. Physical‐mechanical,…
Crystalline acetylene at 141 K is cubic, a = 6.091 (3) /~, space group Pa3, Z = 4. The intensities of all 164 independent reflexions up to sin 0/2 = 0.80 A -1 were measured accurately on a Nonius four-circle diffractometer. For higher sin 0/2, very few significant reflexion intensities exist due to the strong thermal…
Measurements of 3He released by thermal desorption have been made in high-purity annealed, cold-worked, and single-crystal nickel samples. The 3He was introduced by natural tritium decay to eliminate implantation produced defects. Release was observed in the temperature region from ∼100 to 300 K and above 800 K; no de…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIon radicals. 45. Reactions of zinc tetraphenylporphyrin cation radical perchlorate with nucleophilesHenry J. Shine, A. Gregory Padilla, and Shi-Ming WuCite this: J. Org. Chem. 1979, 44, 23, 4069–4075Publication Date (Print):November 1, 1979Publication History Published onli…
Gallium nitrate, administered intravenously to patients with advanced cancer, produced renal functional abnormalities consistently at a dose of 750 mg/m2. The toxicity at that dose could be modified by fluid loading and osmotic diuresis. Pharmacokinetic studies revealed a biphasic half-life, (T 1/2 alpha = 87 minutes…
The periodic banding pattern of stained collagen fibrils observed in the electron microscopic can be correlated with the charge distribution deduced from the amino acid sequence. Earlier work used alpha 1 chain sequence data only. The present study incorporates alpha 2 as well as alpha 1 sequence data, so that the com…
The kinetics of the catalyzed autoxidation of hydrogen sulfide to sulfur, thiosulfate, and sulfate in aqueous solution has been investigated potentiometrically over the pH range 5-12. The catalytic effects of cobalt(II), nickel(II), and copper(I1) 4,4’,4”,4”'- tetrasulfophthalocyanine have been determined, and differe…
Abstract.- The problem of the stability of gas bubbles in a sound field has been investigated using a model for the motion of a nearly spherical bubble in a slightly viscous liquid. The radial motion amplitude and the pressure amplitude thresholds for the instability of the spherical shape have been obtained by the th…
Measurements of magnetization curves for Fe-Ni Invar alloys have been made at various temperatures between room temperatures and about 450°C. Specimens used were in a sphere shape, which were obtained from the same ingots that the specimens used for the thermal expansion measurements had been taken from. By comparing…