Materials Literature
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The model developed by Flory and Vrij 8 to account for the dependence of melting point on chain ength of linear chain homologues has been extended and applied to polyethylene oxide polymers with molecular weights in the range 200–4000. Enthalpy and entropy of fusion are described in terms of the number of monomer repe…
Abstract The thermal degradation of methyl α‐ D ‐glucopyranoside, a cellulose model of intermediate complexity, was investigated in an attempt to gain insight into the pyrolytic reactions of analogous cellulose systems. The pure glucoside pyrolysis proceeds through formation of an intermediate of higher thermal stabil…
Abstract The connection between the growth rate and morphology of supermolecular structures was investigated for polyoxymethylene which was isothermally crystallized from the melt at various temperatures. Optical and electron microscopy showed that below 158°C the crystallization occurred in the spherulite form, while…
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Abstract This preliminary study has related the nature of rupture in starch grains, induced by ultrasound, to the ambient atmosphere, the concentration of the suspension, the frequency and the time of irradiation. It has been tentatively concluded that principally mechanical effects have been induced under conditions…
Pentacene and hexacene both react with sulphur to form stable hexasulphides for which double fused thiathiophthen structures (6) and (8) or (9) are proposed. The electrical conductivity of hexacene hexasulphide is similar to that of the well-known naphthacene tetrasulphide (1) and 109 times greater than that of pentac…
A synergistic effect is apparent when catalysts are used in hydrogen electrodes. The exact mechanism of this effect depends on the composition and mode of formation of a reduced intermediate tungsten oxide. Chemical analysis and x‐ray studies confirmed that this intermediate oxide consists of blue tungsten bronzes. Th…
Native, acid-soluble and acid-insoluble collagen from the tail tendons of rats and calves have been reduced by 3H-sodium borohydride. The reduced cross-link derivatives were separated by ion exchange chromatography. The destruction of the cross-links under the conditions of hydrolysis was measured. By applying the app…
Quantum chemistry is now some 40 years old, but the problem of calculating the rates of complex reactions, in a useful approximation, from the fundamental atomic constants, remains intractable.
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R. G. Linford, Chem. Soc. Rev., 1972, 1, 445 DOI: 10.1039/CS9720100445
The crystallite orientation distribution function has been determined for cold‐rolled copper, copper‐10 per cent zinc and copper‐30 per cent zinc ( α ‐brass) at cold reductions of 0, 20, 40, 60, 80, 90 and 95 per cent. The copper texture exhibits a steady development and contains a tube of orientations between limits…
A single-crystal X-ray structure analysis of Prussian Blue, Fe4[Fe(CN)6]3,14H2O, reveals that the space group symmetry of the approximate structure is Oh5-Fm3m with occupancy factors of 0·75 for FeII, C, and N; the more detailed investigation demonstrates deviations from the cubic face-centred symmetry.
The purpose of this research was to develop a plasma polymerization process for producing polymeric films and to achieve an understanding of the chemistry involved. A technique for the production of polymer coatings from a capacitively coupled RF plasma is presented. The resulting films contain trapped free radical si…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic properties of a series of hydroxo-bridged complexes of 2,2'-dipyridyl and copper(II)James A. Barnes, Derek J. Hodgson, and William E. HatfieldCite this: Inorg. Chem. 1972, 11, 1, 144–148Publication Date (Print):January 1, 1972Publication History Published online1 Ma…
The anodic behavior of titanium in the presence of fluoride ion and sulfuric acid has been studied. Fluoride ion accelerates active corrosion and results in more active, time‐dependent corrosion potentials and greatly increased current requirements for passivation. The critical current density is found to be first ord…
The transient current of hydrogen removal from iron following steady‐state permeation is analyzed theoretically for two limiting conditions at the input side. For the fastest possible removal ( C = 0 at X = 0 and at X = L ) , the amount extracted at the potentiostated side ( X = L ) is one third of the total present a…
A series of investigations were carried out to determine the critical potentials for the growth of localized corrosion on Type 316 and Type 316L stainless steel in chloride media using artificial specimens having the macroscopic local anode separated from the cathode. The critical potential value for the pitting in 0.…
A dielectric study of dilute solutions of small molecules in ortho-terphenyl in the supercooled liquid state shows that their microbrownian motions may occur at 105 to 1010 s slower than in normal low viscosity solvents. The dielectric loss curves are far broader than a single relaxation time process with an apparent…
A sensitive computational method allowed the determination of 0.7 kcal/mol based on various previously reported experimental investigations. For the first time the gaseous compounds and were included in a thermodynamic evaluation of the Si‐H‐Cl system. Diagrams relating over the temperature range of 400°–1700°K indica…