Materials Literature
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Abstract Polyvinyl chloride when heated loses HCl, presumably by a “zipper” mechanism. The loss of each molecule of HCl from the polymer results in the formation of a double bond, which activates adjacent chlorine and causes the decomposition reaction to propagate along the resin chain. Virgin and degraded resins were…
A theory of the broadening of multiplet components in magnetic resonance spectra of coupled nuclei due to electric quadrupole spin-lattice relaxation is presented. It is shown that the broadening of the components of the 1:1:1 triplet for nuclei of spin 1/2 coupled to a nucleus of spin 1, is 3/2 as great for the outer…
Single crystals of nickel (purities 99.98% and 99.4%) have been deformed in tension at various temperatures between 4.2°K and 300°K. Shear stress-shear strain relations have been determined as well as the reversible change of flow stress with temperature. The work-hardening parameters obtained are discussed in terms o…
Bostwick H. Ketchum; A Treatise on Limnology, Vol. I. Geography, Physics and Chemistry, AIBS Bulletin, Volume 8, Issue 2, 1 April 1958, Pages 47–48, https://doi
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerism of Some α-Hydroxysilanes to Silyl EthersA. G. BrookCite this: J. Am. Chem. Soc. 1958, 80, 8, 1886–1889Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 1958https://doi.org/10.1021/ja01541a026RIGHTS & PERMI…
The electrical conductivity and thermoelectric power of the semiconductor Bi 2 Te 3 have been measured between 150°K and 300°K. n-type and p-type samples with a wide range of carrier concentration have been included. Most samples have shown extrinsic conduction and have been partially degenerate over at least part of…
The behavior of an infinitely long flexible filament after transverse impact is treated theoretically. The filament is assumed to have a tension-strain curve which is always concave downwards and to have no short time creep or stress relaxation effects. Under most conditions the impact initiates a variable strain that…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Application of Thermoanalytical Techniques to Reaction Kinetics: The Thermogravimetric Evaluation of the Kinetics of the Decomposition of Calcium Oxalate MonohydrateEli S. Freeman and Benjamin CarrollCite this: J. Phys. Chem. 1958, 62, 4, 394–397Publication Date (Print):…
Epoxy resins are suitable media for embedding for electron microscopy, as they set uniformly with virtually no shrinkage. A mixture of araldite epoxy resins has been developed which is soluble in ethanol, and which yields a block of the required hardness for thin sectioning. The critical modifications to the conventio…
The temperature dependence of the crystalline anisotropy constants of iron, cobalt, and nickel is discussed. It is shown that Zener's result for iron (i.e., the first anisotropy constant varies as the tenth power of the magnetization) also may be derived from molecular field theory. In cobalt a satisfactory agreement…
The band structure of crystalline KCl has been calculated in an LCAO (linear combination of atomic orbitals) approximation. Interactions between free-ion Hartree-Fock functions are calculated directly from molecular-type integrals without reducing exchange interactions to an exchange potential. The structure of the fi…
Abstract The flash photolysis of many quinones in solution produces a number of transient intermediates, each with its characteristic absorption spectrum. A preliminary study of these showed that the appearance of intermediates is clearly related to the efficiency of the quinone as a photosensitizer. A detailed study…
The theoretical x-ray intensities scattered from perfectly regular, condensed, aromatic molecules of various sizes have been presented previously in numerical form. A matrix method is described whereby a linear combination of such theoretical curves may be fitted to the observed intensities with minimum total square e…
Complex alloy structures, particularly those of transition metals, are considered as determined by the geometricnl requirements for sphere packing. A characteristic of the class of structures discussed is that tetrahedral groupings of atoms occur everywhere in the structure--alternatively stated, coordination polyhedr…
Abstract Values of limiting viscosity number, Huggins' interaction constant, k ′, osmostic molecular weight and Flory-Huggins' constant, μ, of masticated and unmasticated rubber have been compared. A calibration of limiting viscosity against molecular weight has been obtained for masticated rubber, but one is not avai…