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Abstract The flow behaviors of a series of polyvinylchloride (PVC) resins covering a broad range of molecular weight have been examined at several temperatures. It has been shown that the influence of temperature on viscosity depends on the temperature range. That is, the flow activation energy is not constant but can…
An empirical rule governing the chemical shifts of X-ray absorption edges has been proposed and tested.
Magnetic correlations influence the energy of conduction electrons through the exchange coupling. A magnetization leads to a splitting of the band where, however, the states of the higher band are unstable against spin-flip with spin-wave production. The rather unknown ion-position dependence of the spin Hamiltonian c…
Room temperature 57Fe Mössbauer spectra were taken on atomically ordered and disordered iron-cobalt samples as a function of composition between 25 and 75 at.% cobalt. The degree of long-range order was determined in selected samples using neutron diffraction. The maximum values of the effective field (He) and isomer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly blues. V. Electronic spectra of one- to six-electron blues of 18-metallodiphosphate anionsElias Papaconstantinou and Michael T. PopeCite this: Inorg. Chem. 1970, 9, 3, 667–669Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRole of p-phenylene groups in nematic liquid crystalsMichael J. S. Dewar and Ronald S. GoldbergCite this: J. Am. Chem. Soc. 1970, 92, 6, 1582–1586Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://doi.org…
Abstract Polymers of poly(ethylene terephthalate) (PET) always contain a certain amount of incorporated diethylene glycol (DEG), substituting the incorporated glycol. DEG is formed in a side reaction during the ester interchange of dimethyl terephthalate (DMT) with ethylene glycol or during direct esterification of te…
A preliminary account is given of sharp “rays” and related intensity structure revealed by high-resolution classical calculations of atomic scattering from an ordered monolayer. Factors related to use of structural features of the intensity maxima for investigation of atom–surface interaction fields are discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecipitation during electromigration of ionsJoris. DemanCite this: Anal. Chem. 1970, 42, 3, 321–324Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021/ac60285a003https://doi.org/1…
From the magnetic susceptibility measurement on YCrO3 above TN=141°K, two exchange constants J1 and J2 are estimated to be J1=−8.7 cm−1 and J2=−1.0 cm−1. In DyCrO3 weak ferromagnetism is observed along the a axis, with TN=146°K. When temperature goes below 5°K, the direction begins to rotate towards the b axis. In SmC…
Abstract The dependence of tensile strength of a number of vulcanizates on temperature has heen studied. A critical temperature θ c is found for natural rubber at which an abrupt change in strength occurs. This temperature depends on degree of crosslinking and also on the nature of the vulcanizing system. The presence…
The van Laar model of the spin structure of CoO in the antiferromagnetic state is supported on the basis of neutron-diffraction data from a single crystal. Then, the magnetic form factor of the ${\mathrm{Co}}^{++}$ ion in CoO is calculated. The anisotropic part of the form factor is studied in detail to arrive at the…
It was recently noted that the dynamic domain structure in a ferromagnetic material may differ markedly from that observed under static conditions. In this investigation the dynamic size of magnetic domains in a rectangular single-crystal specimen of an iron-3% silicon alloy (2.5 cm×3.3 cm×0.22 mm with a (001) [100] o…
An attempt has been made to use low-voltage alternating current to kill microorganisms such as Escherichia coli. The bactericidal effect depends on the energy passing through the suspension and on the time during which the cells are left standing in the medium after the treatment. Most of the toxicity is due to an ind…
This paper describes two related instabilities of spherical bubbles that are set into pulsation by a sound field. One instability is the observed onset of erratic dancing by bubbles that are trapped in a standing wave. This instability occurs when the sound-pressure amplitude exceeds a threshold value, and we measured…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic spiropyrans. I. Absorption spectra and evaluation of the .pi.-electron orthogonality of the constituent halvesNorris W. Tyer Jr. and Ralph Sherman BeckerCite this: J. Am. Chem. Soc. 1970, 92, 5, 1289–1294Publication Date (Print):March 1, 1970Publication History…
Alpha alumina with additions of TiO 2 sintered more rapidly than “pure” alumina. The rate of initial sintering increased approximately exponentially with titania concentration up to a percentage beyond which the rate of sintering remained approximately constant or decreased slightly with additional titania. The concen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly blues. IV. Spectroscopic and magnetic properties of some reduced polytungstatesGideon M. Varga Jr., Elias Papaconstantinou, and Michael T. PopeCite this: Inorg. Chem. 1970, 9, 3, 662–667Publication Date (Print):March 1, 1970Publication History Published online1 Ma…
ADVERTISEMENT RETURN TO ISSUEPREVArticleStructure of porphyrins and metalloporphyrinsEverly B. FleischerCite this: Acc. Chem. Res. 1970, 3, 3, 105–112Publication Date (Print):March 1, 1970Publication History Published online1 May 2002Published inissue 1 March 1970https://pubs.acs.org/doi/10.1021/ar50027a004https://doi…
Many crystals produce a diffuse scattering of X-rays which is localized in a series of relplanes. It is shown that the corresponding linear disorder in the crystal may have various origins. In silicon, the scattering is due to thermal vibrations and is well explained by the elastic properties of the crystal. In neutro…