Mechanisms of polymer stabilization
Abstract
Materials Literature
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Microscopic Effects of Ultrasound on the Structure of Potato Starch Preliminary Study
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…
Synthesis, structure, and electrical properties of naphthacene, pentacene, and hexacene sulphides
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…
The Anodic Oxidation of Hydrogen on Platinized Tungsten Oxides
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…
The Effects of Acetic Acid on Collagen Cross-Links
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…
Crystal and Ligand Field Models of Solid Catalysts
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.
The influence of morphology on the mechanical properties of crystalline polymers
Abstract
Surface energy of solids
R. G. Linford, Chem. Soc. Rev., 1972, 1, 445 DOI: 10.1039/CS9720100445
The Development of Texture in Copper and Copper‐Zinc Alloys
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…
Single-crystal study of Prussian Blue: Fe4[Fe(CN)6]2, 14H2O
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.
Organosilicon Films Formed by an RF Plasma Polymerization Process
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…
Magnetic properties of a series of hydroxo-bridged complexes of 2,2'-dipyridyl and copper(II)
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 Effect of Fluoride Ion on the Anodic Behavior of Titanium in Sulfuric Acid
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…
Mathematics of the Electrochemical Extraction of Hydrogen from Iron
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…
Critical Potential for Growth of Localized Corrosion of Stainless Steel in Chloride Media
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.…
Dielectric study of the motion of molecules in the supercooled liquid state
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 Thorough Thermodynamic Evaluation of the Silicon-Hydrogen-Chlorine System
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…
The meso-reactivity of porphyrins and related compounds. Part V. The meso-oxidation of metalloporphyrins
The action of hydrogen peroxide in pyridine on a variety of metal complexes (Mn, Fe, Co, Ni, Cu, and Zn) of octa-ethylporphyrin under specified conditions has been shown to give metal octaethyloxophlorin derivatives in those cases where the complexed metal ion has a readily available higher oxidation level. Manganese(…
Antiferromagnetism in transition-metal complexes. Part IV. Lowlying excited states of binuclear copper(II) carboxylate complexes
The singlet–triplet–singlet model describing the anomalous magnetic properties of binuclear copper(II) carboxylates is applied to the available experimental data on some 140 compounds. About one-sixth of the data was eventually rejected because of the poor fit with both this and the Bleaney–Bowers model. The trend in…
Dynamic Recrystallization of Copper during Hot Torsion
Tubular specimens of oxygen-free, high-conductivity copper have been deformed by hot torsion at 800° C (1073 K) (O.8T m ) or at 950° C (1323 K) (0.9T m ) at strain rates of 3.7–11.1 S−1 to true strains of ∼ 30. The specimens were quenched to room temperature in 3 s under one of two conditions: stopping the deformation…