Materials Literature
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Abstract Elastomeric networks made up of chain molecules of sufficient structural regularity generally exhibit strain‐induced crystallization. Crystallites thus formed have a pronounced reinforcing effect within the network, and thus increase its ultimate properties (ultimate strength and maximum extensibility), Incre…
Abstract The primary objective of the present study was to elucidate the relative contributions of exchangeable cations and surface forces to the swelling pressure, Π, of montmorillonite. To achieve this objective, measurements were made of the amount of water imbibed by Na‐saturated montmorillonites having different…
A model for high-spin?low-spin transitions in transition metal compounds is presented. The Jahn–Teller coupling between the d electrons and local distortion is considered as the driving force for the transition. The system built up of octahedrally coordinated Fe(II) complexes is studied microscopically on the basis of…
Further investigations, succeeding to the works of J. Phys. Soc. Japan 26 (1969) 631 and 29 (1970) 323, on the magnetic properties of Co(S x Se 1- x ) 2 in the whole concentration ranges (0≤ x ≤1) were performed by means of high magnetic field, electrical resistivity and low temperature X-ray diffraction measurements.…
The NADPH molecule binds to dihydrofolate reductase in an extended conformation. Several of the individual dihedral angles, especially in the adenine mononucleotide portion of the coenzyme, differ from their minimum energy conformations. The ribose phosphate portions of the coenzyme are involved in numerous specific h…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the Structure of Acetylene-Terminated Polyimide Resins Using Magic-Angle Carbon-13 Nuclear Magnetic ResonanceM. D. Sefcik, E. O. Stejskal, R. A. McKay, and Jacob SchaeferCite this: Macromolecules 1979, 12, 3, 423–425Publication Date (Print):May 1, 1979Public…
Abstract Periodic feed switching between carbon monoxide/argon and oxygen/argon mixtures to a gradientless reactor has been found to significantly increase the average reaction rate as compared to the steady state rate, when the time averaged feed concentrations in both cases are stoichiometric. The rate enhancement a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetry and isomer concepts in the evaluation of statistical factorsChung-Sun ChungCite this: Inorg. Chem. 1979, 18, 5, 1318–1321Publication Date (Print):May 1, 1979Publication History Published online1 May 2002Published inissue 1 May 1979https://pubs.acs.org/doi/10.1021/ic…
Abstract Products from the thermal decomposition of a chlorinated aromatic polyamide fabric are described for conditions of pyrolysis and flaming and nonflaming oxidative degradation. Volatile degradation products were identified by gas chromatography‐mass spectrometry (GC‐MS) and the condensible fraction, by infrared…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPosition of the 3T1g .rarw. 1A1g transition in hexacyanocobaltate(III). Analysis of absorption and emission resultsV. M. Miskowski, Harry B. Gray, Randall B. Wilson, and Edward I. SolomonCite this: Inorg. Chem. 1979, 18, 5, 1410–1412Publication Date (Print):May 1, 1979Public…
Abstract The NH 3 ‐modified swelling method was used for fume silica‐filled silicone rubber compounds and vulcanizates. The method provides an estimation of the polymer–filler interaction in the system. Bound rubber reduction due to the modified swelling is shown to be dependent on the silica surface silanol content i…
Abstract Oxyfluorination and postfluorination behaviors of poly(vinylidene fluoride) films, as well as hydrolysis of the films treated so far, have been studied by infrared (IR) spectrometry. By exposing the polymer film to a mixture of oxygen and fluorine at about 90°C acyl fluoride groups attendant on the scission o…
From 1335 BVRI observations of 189 stars in selected areas 92-115, Landolt's (1973) network of faint UBV standards has been extended to R I. Of these stars, 173 have four or more observations. The (U-B) values of Landolt are adopted, and a well-observed equatorial faint-star network is presented on the Johnson UBVRI p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-ray photoelectron spectra of inorganic molecules. 21. Sulfur 2p chemical shifts associated with the binding of thiol and thioether groups of transition metal ionsV. Srinivasan, E. I. Stiefel, A. Elsberry, and R. A. WaltonCite this: J. Am. Chem. Soc. 1979, 101, 10, 2611–261…
The regenerative response of minced cardiac muscle grafts in the adult newt was studied using autoradiography and electron microscopy. One-sixteenth to one-eighth of the newt ventricle was amputated, minced, and returned to the wounded ventricle. At five days after grafting, no reorganization of graft msucle pieces wa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolid State Extrusion of Poly(vinylidene fluoride). 1. Ram and Hydrostatic ExtrusionW. T. Mead, Anagnostis E. Zachariades, Toshio Shimada, and Roger S. PorterCite this: Macromolecules 1979, 12, 3, 473–478Publication Date (Print):May 1, 1979Publication History Published onlin…
Abstract The present work deals with effect of vulcanization temperature on the polymer-filler interaction parameter, vulcanizate structure, and the technical properties of efficiently vulcanized natural rubber stocks in the presence of different fillers. We have used carbon blacks of four different particle sizes (IS…
The Knight shift and spin-lattice relaxation time of $^{125}\mathrm{Te}$ in tellurium single crystals have been measured between room temperature and the melting point (724 K) using pulsed-NMR methods. Over the entire temperature range, the temperature dependence of the Knight shift is found to be determined completel…
I n situ XPS photoelectron studies on amorphous thermally evaporated GdFe and GdCo films have been made under UHV conditions. The results were used to test the conventional concept of charge transfer, which had been applied to the materials under discussion. The XPS binding energies were found to be identical in the p…
Conducting particle charging and detachment into a compressed SF6 coaxial electrode gap energized with high direct voltage have been investigated using the charge simulation technique and dimensional analysis.