Materials Literature
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Abstract It has been demonstrated that Raman spectroscopy can be used to follow changes that occur in the network of vulcanizates as a function of cure time. In the system studied we have found that dialkenyl sulfides, cyclic sulfides and conjugated triene structures parallel the cure. In other words, the Raman lines…
The diffusion of iron in aluminium has been recently investigated using ion-implantation and tracer-sectioning method. It has been contended that due to the probable presence of an oxide layer on an aluminium surface, measurements of solute diffusion data by conventional plating and sectioning method give rise to ‘ano…
Abstract Die Hexacyanochromate(III) von Li + , Na + , K + , Rb + , Cs + , NH 4 + , [(C 4 H 9 ) 4 N] + , [(C 6 H 5 ) 4 P] + , [(C 6 H 5 ) 4 As] + und Tl + wurden präpariert und röntgenographisch vermessen. In den Remissionsspektren wurde eine bisher unbekannte Elektronenüberführungsbande bei 45 kK gefunden, die in eini…
Abstract The electronic structures of trans ‐ and cis ‐stilbene are calculated using Pariser and Parr's semiempirical method. The resonance integrals are adjusted so as to give the best agreement with the spectroscopic data. In addition, the potential surfaces of various excited states in stilbene during its isomeriza…
18Ni 180 and 18Ni 200 maraging steels have shown high resistance to stress corrosion cracking in sea water. U-bends had no cracks after exposure for over three years. 18Ni 180 welds also had good resistance, but welds in the 18Ni 200 grade suffered stress corrosion cracking. Cathodic protection of U-bends was benefici…
The dissolution of dicalcium phosphate dihydrate has been studied by following changes in the calcium, phosphate, and hydrogen ion concentrations when undersaturated solutions are inoculated with seed crystals of the salt. The rate of dissolution follows an equation of the first order with respect to concentration; th…
A degenerate excited state is essential to the description of structural rearrangements which account for the relaxational heat capacity, thermal expansion, and compressibility of vitreous B2O3. These relaxational responses cannot be simultaneously described by a two-state model, or by any model involving a single ord…
Abstract The molecular orbital configuration for the ground‐state of O 2 generates the valence formula . “Increased‐valence” formulae for triatomic and polyatomic molecules have been developed recently. In them, more electrons participate in bonding than is possible for the familiar valence‐bond formulae. Using oxyhae…
Abstract The thermal stability of polyethylene containing conventional antioxidants is adversely affected by contact with copper, by certain pigments, and by the addition of a few percent of polypropylene as a processing aid. Polyethylene inhibited with 0.1% of phenolic antioxidants has approximately the same oxidativ…
Abstract Treatment of a polypyromellitimide with hydrazine hydrate yields the biscyclohydrazide of pyromellitic dianhydride and the diamine originally used in the preparation. This reagent was, therefore, employed in a study of oxidised poly‐N,N′‐(4,4′‐diphenylether)pyromellitimide film in an attempt to elucidate the…
The, behavior of corona and the resulting damage in oil-filled insulation were investigated. internal corona should be divided into intrinsic oil corona and bubble corona. The former is far more intense than air corona. The magnitude of the individual charge usually exceeds 1 x 104 pC. Insulation damage barely appears…
Summary The crystal structure of coalingite (Mg 10 Fe 2 (OH) 24 (CO 3 )·2H 2 O) has been determined using single-crystal X-ray methods. The mineral is trigonal, with space group R m, a H = 3·12, c H = 37·4 Å, Z = ½, and (0001) cleavage. The structure is of a layer type, and is based on a structural element about 12·5…
The power dissipated by leakage currents on the surface of wet polluted insulation leads to the loss of moisture from the pollution and the formation of dry bands. The growth of the dry band depends primarily on the surface temperature and on the temperature dependence of the surface resistance. Measurements of dry-ba…
), Tl or Cs; B is Mg, Ni, Cu, Co, or Zn; and X is S or Cr. A comprehensive list of references on the crystallography of the compounds is included.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTransitions and Relaxations in Poly(2,6-diphenyl 1,4-phenylene ether)Wolfgang WrasidloCite this: Macromolecules 1971, 4, 5, 642–648Publication Date (Print):September 1, 1971Publication History Published online1 May 2002Published inissue 1 September 1971https://pubs.acs.org/d…
Abstract Stability equations were derived for Belle Fourche and Aberdeen montmorillonites. Both the composition of structural ions and the cation exchange capacity (CEC) were considered to be essential features of montmorillonite stability. However, montmorillonite stability was considered to be independent of the sol…
Abstract High molecular weight poly‐N,N′‐(4,4′‐diphenylether)pyromellitimide film was prepared from pyromellitic dianhydride and 4,4′‐diaminodiphenylether and the oxidative degradation at 400°C was studied by weight loss measurements, infrared spectrometry and saponification experiments. The results indicated the rapi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEllipsometric investigations of anodic film growth on iron in neutral solution. Prepassive filmJ. O'M. Bockris, H. Wroblowa, and V. BrusicCite this: J. Phys. Chem. 1971, 75, 18, 2823–2829Publication Date (Print):September 1, 1971Publication History Published online1 May 2002…
Cotton fibers were broken under a variety of conditions and the fractures were examined in a scanning electron micro scope. Many fractures occur adjacent to the reversal zone and not through it, indicating that the reversal itself is strong, but, because of its existence in the fiber, it is a source of weakness in tha…
A synthetic medium was developed for further study of intracellular calcification by Bacterionema matruchotii. The medium contained metastable calcium phosphate, six other salts, three purines, two pyrimidines, nine vitamins, pimelic and thioctic acids, vitamin-free casein hydrolysate, and glucose. The vehicle was 0.1…