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Chemical Stress-Relaxation of Polydimethylsiloxane Elastomers1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical Stress-Relaxation of Polydimethylsiloxane Elastomers1R. C. Osthoff, A. M. Bueche, and W. T. GrubbCite this: J. Am. Chem. Soc. 1954, 76, 18, 4659–4663Publication Date (Print):September 1, 1954Publication History Published online1 May 2002Published inissue 1 September…
The Chemistry of 1,2-Dithiolane (Trimethylene Disulfide) as a Model for the Primary Quantum Conversion Act in Photosynthesis1a
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Chemistry of 1,2-Dithiolane (Trimethylene Disulfide) as a Model for the Primary Quantum Conversion Act in Photosynthesis1aJ. A. Barltrop, P. M. Hayes, and M. CalvinCite this: J. Am. Chem. Soc. 1954, 76, 17, 4348–4367Publication Date (Print):September 1, 1954Publication H…
The Plasticity of an Isotropic Aggregate of Anisotropic Face-Centered Cubic Crystals
Abstract The plasticity of a polycrystalline aggregate is expressed in terms of the plasticity of the individual grains. It is assumed that the local deviation of stress from the average stress is proportional to the local deviation of strain from the average strain, and it is assumed that plastic flow begins when the…
Hall Effect in Ferromagnetics
Both the unusually large magnitude and strong temperature dependence of the extraordinary Hall effect in ferromagnetic materials can be understood as effects of the spin-orbit interaction of polarized conduction electrons. It is shown that the interband matrix elements of the applied electric potential energy combine…
A Theory of Domain Creation and Coercive Force in Polycrystalline Ferromagnetics
Granular inclusions, grain boundaries, lamellar precipitates, and the crystalline surface have been examined as possible nucleation centers for domains of reverse magnetization in ferromagnetic materials. It is concluded that the surface density of magnetic poles at the grain boundaries ${\ensuremath{\omega}}^{*}$ is…
Crystallization phenomena in polymers - Effect of melt conditions and the temperature of crystallization on the course of the crystallization in polyethylene terephthalate
Abstract A detailed analysis has been made of the course of crystallization in polyethylene terephthalate at different temperatures and from different preceding melt temperatures. The theoretical deductions based on the mechanisms surmised in part II and kinetical analysis of the density changes with time have been co…
Crystallization phenomena in polymers - Preliminary investigation of the crystallization characteristics of polyethylene terephthalate
Abstract An exploration has been made of the factors that affect the rates of crystallization of polyethylene terephthalate and the effect of the crystallization conditions on the crystalline state of the polymer. The rate and course of the crystallization is affected by molecular structural features such as molecular…
HOW PAINTS PREVENT CORROSION
Abstract From the electrochemical theory of corrosion it follows that corrosion can be stopped by suppressing either the cathodic or the anodic reaction, or by inserting between the cathodic and anodic areas a large resistance, which impedes the movement of ions. Calculations indicate that paint films are so permeable…
Nuclear Division and the Life Cycle in a Streptomyces sp.
SUMMARY: The life cycle of a Streptomyces sp. was studied by the Robinow HCl-Giemsa method of nuclear staining, and is described in the following manner: (1) initial nuclear division phase; (2) primary mycelium; (3) secondary mycelium (including aerial); (4) the formation of spores. It was observed that the method of…
Factors affecting the thermal stability of polytetrafluoroethylene
The structure and kinetics of thermal decomposition of polytetrafluol'oethylene suggestcd sev eral m ethods for impro vemcnt of its stability: (a) p olym crization in the presen ce of fluor oca rbo ~l catalysts or ph<;>to?hemically to eliminate labile centers for initiation. (b) inclu-SlOn of foreIg n structural Ullit…
Requirements contributing to the design of devices used in correcting electron lenses
The voltage requirements for a modification of the spherical correction system of Seeliger (2) are given. The potential changes introduced by unintentional asymmetries of non-rotationallysymmetrical elements are calculated and an expression is given for the resulting aberrations. It is shown that some of these can be…
The polyphosphates of calcium, strontium, barium and magnesium: Their complex character, composition and behaviour
Abstract A study of pyro‐ and tripoly‐phosphates, by heterometric (photometric study of suspensions), pH and conductometric methods, was made on a quantitative basis. From the curves obtained, the composition and properties of the salts and complexes, which exist in solution or in the solid state, were deduced. All th…
The Thermal Decomposition of Nickel Oxalate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Thermal Decomposition of Nickel OxalateJ. A. Allen and D. E. ScaifeCite this: J. Phys. Chem. 1954, 58, 8, 667–671Publication Date (Print):August 1, 1954Publication History Published online1 May 2002Published inissue 1 August 1954https://pubs.acs.org/doi/10.1021/j150518a0…