Materials Literature
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Abstract Linear high‐density polyethylene is crosslinked by exposing it to a hydrogen glow discharge and alternatively by exposing it to a low‐pressure Hg–A ultraviolet lamp in a dry nitrogen atmosphere. For the UV lamp case, the crosslinked gel is measured as a function of the radiation dose. For the plasma case, the…
A class of point processes that possess intensity functions are studied. The processes of this class, which seem to include most point processes of practical interest, are called regular point processes (RPP's). Expressions for the evolution of these processes and especially for their joint occurrence statistics are d…
Abstract The conclusions of the present work may be summarized as follows. 1. The effective volume of carbon black in rubber, as measured by the low-strain equilibrium modulus, is equal to the true volume of carbon plus about half of the occluded volume of rubber calculated from the DBP absorption of the carbon black.…
This article reviews the theory of atomic vibrations in disordered solids, ranging from almost perfect crystal lattices to glassy materials where geometrical regularity is entirely absent. As a preliminary, the basic notations and equations of conventional lattice dynamics are briefly outlined; the essential equivalen…
Based on a simple atomic model giving the potential between electrons and atoms as V ( r )= Ze 2 a s −1 / sr s , the range of electrons penetrating solid targets is derived. Starting from the generalized power law involving the energy loss, the Lenard-type absorption law, and the assumption that the distribution of th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparation of viscosity and temperature effects on the singlet pathway to stilbene photoisomerizationJack Saltiel and Joan T. D'AgostinoCite this: J. Am. Chem. Soc. 1972, 94, 18, 6445–6456Publication Date (Print):September 1, 1972Publication History Published online1 May 200…
The basis of intergranular corrosion in austenitic stainless steels is examined by relating the grain boundary composition to the corrosion properties. The technique of Auger electron spectroscopy has been used to obtain the chemistry of intergranular fracture surfaces. It was found that the chromium depleted zones ex…
Tetrasilicic‐mica glass‐ceramics are formed from glasses in the simple quaternary system K 2 O‐MgF 2 ‐MgO‐SiO 2 . The mica phase crystallizes as small (400‐Å) spherical grains at #625°C and recrystallizes into larger booklets at 940°C. The mica platelets grow by a dissolution and reprecipitation mechanism, thereby inc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemically induced dynamic nuclear polarization. VIII. Spin dynamics and diffusion of radical pairsR. KapteinCite this: J. Am. Chem. Soc. 1972, 94, 18, 6251–6262Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Published inissue 1 Septem…
Abstract Chromocene deposited on silica supports of high surface area forms a highly active catalyst for polymerization of ethylene. Polymerization is believed to occur by a coordinated anionic mechanism previously outlined. The catalyst formation step liberates cyclopentadiene and leads to a new divalent chromium spe…
The dynamics of order-disorder-type ferroelectrics and anti-ferroelectrics is discussed with reference to recent theoretical and experimental investigations. Following a short review of the lattice dynamical theory of structural phase transitions the pseudo-spin formalism appropriate for order-disorder-type systems is…
Introduction Stress corrosion cracking is a phenomenon that is of interest to a wide range of metal users. When it occurs under service conditions, often without any prior indication of impeding failure, its effect may be catastrophic.
X-ray scattering intensities from unoriented samples of cholesteryl nonanoate and myristate are reported for several temperatures in the smectic $A$, cholesteric, and isotropic liquid phases. The measured Bragg-scattering intensities from the smectic planes are used to test a recent theoretical model of the smectic $A…
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