Materials Literature
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Abstract Reaction of UO2F2 with UF5 at 400 °C under UF6-pressure of 3 atm followed by evaporation of excess UF5 has yielded a greenish white residue. Its X-ray diffraction pattern and infrared spectrum are sufficiently unique to establish that this material is a true compound. Its chemical formula has been shown to be…
Abstract Lattice constants of sodium chlorate and sodium bromate and their mixed crystals were determined over the temperature range from room temperature to 320 °C. The observed lattice constants for the various compositions show strong deviations from those expected from Vegard's rule. The lattice constants at vario…
Abstract X-ray powder diffraction and single-crystal data are reported for a series of isomorphous compounds with the general chemical composition (Fe,Al) 3 (K,NH 4 ,H 3 O)H 14 (PO 4 ) 8 ·4H 2 O. The compounds are monoclinic with space group C2/c. Unit-cell parameters were determined on the mixed salt (Fe 0.84 ,Al 0.1…
The conventional, large scale techniques employed for casting fabrication ingot in aluminium alloys allow, in certain circumstances, the molten alloy to come into contact with water. Industry codes of practice have been developed that reduce the likelihood of explosions in these "run-out" situations to a very low leve…
The effect of varying degrees of stretch on various cotton yarn properties during mercerization was studied. Scoured cotton yarns were slack mercerized in an aqueous solution of caustic soda, then restretched to 90%, 94%, 96%, 100%, and 103% of the original lengths. There was a considerable increase in strength and a…
Als eine Art „anorganische Sandwich‐Verbindung”︁ ohne Metall‐Metall‐Bindungen kann der Komplex 1 angesehen werden: Er enthält zwei relativ flache [Mn 4 III O 2 ]‐Einheiten und dazwischen ein Mn II ‐Atom. 1 bildet sich in Form schwarzer Kristalle aus [Mn 3 O(O 2 CPh) 6 (py) 2 (H 2 O)], das in Acetonitril gelöst und mit…
Abstract Aromatic polyesters containing imide pendant groups have been prepared from diphenols and 5‐imidoisophthaloyl chlorides by the interfacial polycondensation method. Linear polyesters without substituents have also been synthesized by the same method for comparative purposes. The presence of side imide groups e…
Abstract Zn(II) complexes of pyridoxal–α-amino acid Schiff bases showed photochromic behavior in methanol. Spectral studies revealed that intramolecular nucleophilic attack of 5′-hydroxyl group on imine linkage forms cyclic α-amino ether intermediates which thermally return to the original complexes. The photochromism…
Triboelectric charging of hair modified by surface deposition of a series of monomeric and polymeric long alkyl chain quaternary ammonium salts was examined. The length of the hydrophobic alkyl chain in both monomeric and polymeric surfactants, the composition of copolymer-containing surfactant and nonsurfactant units…
Nylon 6, nylon 66, and poly(ethylene terephthalate) (PET) fibers were subjected to superheated steaming. The effects of a small amount of water vapor in superheated steam on the fine structure and dyeing behavior of the fibers were examined at varying steaming temperatures by measuring shrinkage, crystallinity, crysta…
UV‐visible, infrared, and Raman spectroscopic studies have shown that little to weak interactions occur between the halogens , , and or the interhalogens , , , and , and . The degree of dissociation of the interhalogens in have been determined to be similar to those in the nonpolar medium of . Cyclic voltammetric stud…
Testing cables in the field requires a specialized knowledge of dielectric behavior, electrical stress phenomena, safe and proper use of test equipment, and interpretation of test results. Theoretical and practical aspects of high-potential field testing of medium- and high-voltage extruded cables are discussed. The f…
The mechanical properties of ferrite filled thermoplastics at high filler loadings of 75-85% by weight are reported. Barium ferrite was used as the filler in the magnetic polymeric composites. Three types of thermoplastic elastomers, namely, styrenic, polyester-ether, and polyurethane were investigated as matrix mater…
Abstract Further studies have been carried out on the thermal behaviour of partially neutralized poly(acrylic acid), using ammonium or sodium ions as the neutralizing species. It was found that, unlike the partial poly(acrylates) of lithium, sodium or potassium, partially neutralized ammonium poly(acrylate) did not un…
The site preference of iron and cobalt atoms in Nd2(Fe,Co)14B and the local magnetic properties are examined by Mossbauer spectroscopy for specimen of (Fe1-xCox)75Nd16.5B8.5(x= 0\sim1). From the measurement of relative intensities of resonant57Fe nuclei in the six sites, it is concluded that iron atoms preferentially…
Calculations of field components for thin-film recording heads originally done with the finite difference method on a desktop computer were redone using a mainframe computer. The new computations agree much better with experimental results and give simpler, more accurate coefficients for the equations previously publi…
Precision measurements of the dispersion relations for phonons along the high-symmetry directions in gamma -Sn (Sn 0.8 In 0.2 ) have been performed at room temperature by inelastic neutron scattering. Phonon group velocities have been extracted from the data with an accuracy of 5-10%. Several abrupt changes of group v…
Abstract There is increasing demand for high temperature greases capable of operating in the range of 175–235°C. In this paper, one type of grease, polyurea, is described, and its preparation given, in terms of raw materials, temperature, solvents, base fluids including synthetics, catalysts, additives and thickeners.…
Many articles of protective clothing have become quite expensive, and consequently, there is need for reuse of those articles. One concern, however, is whether the articles require decontamination if they are splashed by a liquid or contact a hazardous gas. Concerns over contamination involve two important aspects: 1)…
Abstract Two types of polypyrazoles, unsubstituted and phenylated, were prepared by a novel synthetic route involving the cyclopolycondensation of aromatic dihydrazines and aromatic dipropynones. The polymers had inherent viscosities as high as 1.05 dL/g and were soluble in N, N ‐dimethylacetamide, chloroform (phenyla…