Materials Literature
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By considering adsorption processes of organic compounds as being determined by the electronic distribution in the "anchoring" group of an adsorbate, a correlation has been derived between adsorption measurements and Hammett‐like substituent constants through the use of Linear Free Energy Relations (LFER). The analysi…
Influence of fiber and matrix characteristics on mechanics of deformation and fracture of fibrous composite
Properties of piezoelectric crystals and ceramics are reviewed as they affect use of such materials in electroacoustic transducers. Extensive data on lead titanate-zirconate ceramics are presented to help in selection of the appropriate material for a variety of applications in the lower and medium frequency range, up…
The rate-theory approach of Eyring and the free-volume theory of Cohen and Turnbull for liquid viscosities have been reconsidered. The rate theory has been reformulated using the Cohen and Turnbull expression for the probability of finding a vacant site and yields an equation of the form η=A0exp[Ev*/RT+γV0/Vf].This re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Diffraction in Crystals, Imperfect Crystals, and Amorphous Bodies.Bernard BorieCite this: J. Am. Chem. Soc. 1965, 87, 1, 140–141Publication Date (Print):January 1, 1965Publication History Published online1 May 2002Published inissue 1 January 1965https://pubs.acs.org/do…
The theory of phase separation from a single phase fluid by a spinodal mechanism is given. The predicted structure may be described in terms of a superpositioning of sinusoidal composition modulations of a fixed wavelength, but random in amplitude, orientation, and phase. Sections through a calculated structure are sh…
CONTENTS I. Introduction 609 II. Dependence of thermal stability on structure of monomer unit 610 III. Dependence of thermal stability on structure of polymer chain 615 IV. Dependence of thermal stability on reactivity of macromolecule 619 V. New thermostable polymers 624
An alcoholic extract of Asclepias curassavica L., a plant widely used in folk medicine for treating cancer and warts, shows cytotoxic activity when tested in vitro against cells derived from human carcinoma of the nasopharynx. Systematic fractionation of the extract has led to isolation and characterization of calotro…
Received 13 November 1964DOI:https://doi.org/10.1103/PhysRevLett.13.764©1964 American Physical Society
Received 13 November 1964DOI:https://doi.org/10.1103/PhysRevLett.13.767©1964 American Physical Society
A method is given to calculate the line structure of vibronic bands for a given coupling function p(s), which latter incorporates the frequency and equilibrium change of the oscillator s. The form of the single lines is generally given in terms of their moments. For the important case, where p(s) decomposes into a sum…
By a combination of experimental isotherms and making use of theoretical results, we establish the validity of the theorem of corresponding states for chain liquids and derive an explicit expression for the reduced pressure—volume—temperature surface encompassing oligomer and high-polymer liquids. For this purpose emp…
A four-electron MO treatment of the interaction of the D2h polyacenes naphthalene, anthracene, pyrene, and perylene to yield D2h dimers is developed, and the energies of these dimers are calculated as functions of the effective nuclear charge to be used in a Slater orbital exponent, and of the intermolecular distance…
Abstract Polymerization of 1,3‐dioxolane was examined with organo‐aluminum compounds, acetyl chloride‐metal halides, and acetic anhydride‐perchloric acid as initiators. Poly‐1,3‐dioxolane obtained easily with these initiators was a white crystalline solid with a melting point of 50–55°C. 1,3‐Dioxolanes with a substitu…
The difference of response of Si semiconductor detectors to $\ensuremath{\alpha}$ particles and electrons has been tested. The mean energy required for electron-hole pair generation by electrons has been found to be different from that for $\ensuremath{\alpha}$ particles. These values are, respectively, ${\ensuremath{…
In elastic electron scattering atomic screening is shown to affect the cross section both at very small and at very large angles. However, for energies above approximately 200 keV the large-angle screening effects are small, and the cross section may be written as a product of two factors, one depending on the screeni…
The two-particle cluster approximation of Strieb, Callen, and Horwitz is extended to ferromagnets and paramagnets with nearest-and next-nearest-neighbor exchange, with particular reference to EuO, EuS, EuSe, and EuTe. Curie temperatures, magnetization curves for general values of the applied field, susceptibility, spi…
The optical spectra of the alkali halides are divided into interband scattering and exciton structure. The scattering or direct-transition structure is shown to be similar to that of the zincblende crystals studied in earlier papers of this series. On this basis the band structure $E(k)$ is deduced empirically from th…
Received 3 November 1964DOI:https://doi.org/10.1103/PhysRevLett.13.688©1964 American Physical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChlorinated Xylene Derivatives for Flame-Retardant Rigid Polyurethane FoamsF. B. Slezak, J. P. Stallings, and Irving RosenCite this: Ind. Eng. Chem. Prod. Res. Dev. 1964, 3, 4, 292–294Publication Date (Print):December 1, 1964Publication History Published online1 May 2002Publ…