Materials Literature
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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…
Specially reactive (sr‐) CaO can be produced by decomposing 1‐ to 10‐μm particles of CaCO 3 in vacuum at ∼650°C. Particles of sr‐CaO appear unchanged in dimension from the original CaCO 3 , but have internal pores with surface areas of 92 m 2 /g, more than twice the surface areas reported in a previous study for CaO m…
Abstract A new approach has been proposed to characterize the state of mixing of carbon black-loaded SBR and cis -polybutadiene compounds. The basic concept is that carbon black aggregates, present when the dispersion is imperfect, affect the modulus of the uncured compound more than that of the cured compound. From c…
It is well known that magnetic properties of Goss-oriented silicon-iron are dependent upon external mechanical stress. This paper describes some of the recent work carried out in the UK on the effects of high compressive stress, combined longitudinal and transverse stresses, and also the effects of elevated temperatur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray study of (NH4)7[H2AsW18O60].16H2O: first example of a heteropolyanion containing protons and arsenic(III)Y. Jeannin and J. Martin-FrereCite this: Inorg. Chem. 1979, 18, 11, 3010–3014Publication Date (Print):November 1, 1979Publication History Published online1 May 2002…
Abstract Various approaches to representing the modulus of a semicrystalline polymer as a composite crystal‐amorphous material are applied to the extensive data of Illers on the shear modulus of linear and branched polyethylenes as a function of crystallinity and temperature. It is found that the modulus of linear pol…
The resistivity, Seebeck coefficient, superconducting transition temperature, and upper critical field have been measured in ${\mathrm{Cs}}_{x}\mathrm{W}{\mathrm{O}}_{3}$ for $0.19<~x<~0.30$. In contrast to ${\mathrm{Rb}}_{x}\mathrm{W}{\mathrm{O}}_{3}$, no temperature-dependent anomalies were observed in either…
The Engell‐Stolica potentiostatic method has been used for the kinetic study of the mechanism of pitting initiation of Al 1199. A statistical treatment of the induction time has been developed in order to get meaningful data. Pitting initiation time has been found to be potential‐independent and the linear increase in…
Abstract A systematic understanding of the heat distortion temperature (HDT) of amorphous and semi‐crystalline polymers is possible through a direct correlation with the modulustemperature behavior. For amorphous polymers, the precipitous drop in modulus at the glass transition temperature makes the HDT a well‐defined…
Hydriding and dehydriding kinetics are derived within the framework of the Johnson-Mehl-Avrami equation. Hydriding is considered to be rate limited by hydrogen diffusion through a growing hydride layer, and dehydriding by hydrogen diffusion through a growing metal layer. Incubation time effects due to surface contamin…
The EPR spectra of ${\mathrm{Fe}}^{3+}$ in the three ferroelectric phases of BaTi${\mathrm{O}}_{3}$ could be interpreted on the basis of the Newman superposition model. In the latter, the position of the nearest (oxygen) ligands determines the EPR spectrum. It is found that the ${\mathrm{Fe}}^{3+}$ participates by les…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstituent effects on strain energiesJames D. Dill, Arthur Greenberg, and Joel F. LiebmanCite this: J. Am. Chem. Soc. 1979, 101, 23, 6814–6826Publication Date (Print):November 1, 1979Publication History Published online1 May 2002Published inissue 1 November 1979https://pubs…