Materials Literature
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Abstract Scanning electron microscopy (SEM) and X‐ray photoelectron spectroscopy (XPS) have been used to examine the nature and quality of wax‐coated RDX crystals. SEM allows a visual assessment of wax‐coated crystals and comparison of different coating processes. XPS has allowed a semiquantitative determination of th…
Abstract The temperature gradients in a Czochralski‐type crystal growth equipment with induction heating can be advantageously influenced by additionally heating the growing crystal and the crucible bottom during the pulling procedure. An experimental solution is presented for both afterheater and bottom heater couple…
Abstract Polysulfides dissolved in non-aqueous solvents react under anaerobic conditions with nitric oxide to yield solutions of nitrosodisulfides. Through the action of NO upon (PNP) 2 S 12 1 [P = P(C 6 H 5 ) 3 ] in acetone a stable compound PNP · SSNO 2 could be obtained. 2 proved to be identical with a red PNP-salt…
Abstract Experimental methods for determining longitudinal crystal moduli of polymers were evaluated in light of recent proceesing methods that produced macroscopic Young's moduli which exceeded ultimate values as found by the x‐ray diffraction method. The spectroscopic techniques of Raman and coherent inelastic neutr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination chemistry and geometries of some 4,4'-bipyridyl-capped porphyrins. Proton- and ligand-induced switching of conformationsRaymond J. Abraham, Philip Leighton, and Jeremy K. M. SandersCite this: J. Am. Chem. Soc. 1985, 107, 12, 3472–3478Publication Date (Print):Jun…
An X-ray structure analysis has been carried out of the monoclinic variety of the zeolite ferrierite from Altoona, Washington. Crystals of this uncommon variety of ferrierite are typically diamond shaped with (100), (201) and dominant (010) faces. The crystal data are a = 18.886(9), b = 14.182(6), C = 7.470(5)A, P = 9…
Abstract So verschiedene Gebiete wie die Stereochemie und die Materialwissenschaften profitieren von detaillierten Untersuchungen des Einflusses, den maßgeschneiderte Inhibitoren auf Wachstum und Auflösung organischer Kristalle ausüben. Bei organischen Kristallen, die in Gegenwart von wachstumshemmenden Additiven ents…
Abstract When virgin polytetrafluoroethylene is heated at intermediate rates, two melting peaks are observed. As the heating rate is increased, the higher‐temperature peak grows at the expense of the lower‐temperature one without any significant change in the total heat of fusion. It is suggested that the higher‐tempe…
The polarization behavior of various pure zinc, Al-Zn, and Zn-Ni coatings was studied to evaluate electrochemical methods for use in testing the performance of such coatings on sheet steel. Behavior in deaerated chloride solutions was found to simulate more nearly the good performance of pure zinc (galvanized) coating…
Magnetic susceptibility and $^{119}\mathrm{Sn}$ M\"ossbauer studies have been carried out on a new series of rare-earth-containing Heusler alloys having the formula ${\mathrm{Pd}}_{2}$RSn (R=Tb--Yb). The Tm and Yb compounds in this series along with Lu, Sc, and Y compounds are superconducting. The magnetic susceptibil…
Abstract Spherical and platy kaolinite crystals were prepared under several hydrothermal conditions. Spherical kaolinite was produced mainly at high solid/water ratio (1/4) and at low temperatures (150°-200°C). Platy kaolinite predominated in products from experiments with intermediate solid/water ratios (1/256-1/16)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer-based sensitizers for the formation of singlet oxygen: new studies of polymeric derivatives of rose bengalJerzy Paczkowski and D. C. NeckersCite this: Macromolecules 1985, 18, 6, 1245–1253Publication Date (Print):June 1, 1985Publication History Published online1 May…
Abstract Interpenetrating polymer networks (IPNs) composed of two or more chemically distinct networks are not only intrinsically interesting as examples of macromolecular chemical topological isomerism but are in practice useful means of controlling mutual miscibility and phase morphology in crosslinked polymers. We…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReevaluation of the dynamic model for rotational diffusion of thin, rigid rods in semidilute solutionG. T. Keep and R. PecoraCite this: Macromolecules 1985, 18, 6, 1167–1173Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published inissue 1…
Abstract Two coupling agents based on trichloro‐s‐triazine with different terminal unsaturated groups were synthesized in order to improve the bonding between cellulose fibers and an unsaturated polyester matrix. The products of the reactions between hydroxyl groups of cellulose and reactive species of coupling agents…
Abstract Eisen(II)‐Komplexe des Typs 1 wurden mittels verschiedener Synthesemethoden dargestellt. Im Gegensatz zu ähnlichen Chelaten des „saloph”︁ und „salen”︁ Typs bilden die high‐spin‐Komplexe 1 stabile high‐spin Diaddukte ( 1a – 1d ) und ein ungewöhnliches Triaddukt ( 1e ) mit Pyridin. Die Oxydationspotentiale Fe I…
The experimentally determined extinction spectra of colloidal hematite, consisting of spherical particles of 0.10, 0.12, 0.13, 0.15, 0.16, and 0.51 microm in modal diameter, respectively, are compared with the corresponding theoretically calculated spectra using the Lorenz-Mie theory. These spectra are most sensitive…
The stability and solubility of complexes formed between AlIII , FeIII and an epicatechin dimer (B2) and an epicatechin polymer or tannin (T) have been studied. Polyphenols such as these could be active in mobilizing iron and aluminium in organic soils; they have the potential to act as bis-catecholate ligands toward…
Localized surface condensations affect microbial stability of intermediate moisture foods (IMF). Two surface modifications previously reported were tested for their ability to improve microbial surface stability; control of surface preservative concentration and reduced surface pH. The effectiveness of a high surface…
Abstract 13 C and 29 Si nuclear magnetic resonance spectroscopy with magic-angle spinning bas been used to study the short-range ordering and bonding in the structures of intercalates of kaolinite with formamide, hydrazine, dimethyl sulfoxide (DMSO), and pyridine- N -oxide (PNO). The 29 Si chemical shift indicated dec…