Materials Literature
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Abstract A wide compositional range of copolymers of 1‐cyclobutene carbonitrile (CBCN) and 1‐bicyclobutance carbonitrile (BBCN) with common vinyl monomers was prepared in order to study systematically the effect of cyclobutane carbonitrile ring incorporation on the glass transition temperature ( T g ). In general, the…
Abstract Durch Erhitzen inniger Gemenge von Na 2 O und NaNiO 2 erhalten wir erstmals Na 5 NiO 4 als stahlgraues Pulver [Na 2 O:NaNiO 2 = 2,2:1; 550°C, 2d, Korundbömbchen]. Auch die Einkristalle sehen so aus [analoge Ausgangsmischung, 650°C, 7d, Ag‐Bömbchen]. Na 5 NiO 4 ist isotyp mit Na 5 GaO 4 , orthorhombisch, Pbca,…
Ten vessels, candidates for the unperturbed storage of analytical calibration gases containing tritium, were investigated. Contamination of 99.7% tritium gas at STP by each container over one year was a function of vessel material and surface preparation. Cylinders of aluminum and stainless steel (SS) could restrict p…
The distribution of soil pH, extractable soil P, and AI was studied during 5 years of cropping in the soil profiles of a gibbsihumox soil at one P level (280 kg P/ha), three Si levels (0,830, and 1.660 kg Si/ha), and three pH levels (5.5, 6.0, and 6.5). The effect of residual Si on increased P availability was evident…
Young's modulus, the critical tensile stress, and the fracture stress of Stycast-1266 have been determined by the tension test as functions of temperature between room temperature and 2.2 K.
Abstract The radical polymerization of several vinyl monomers has been studied in the presence of cupric chloride. A termination reaction with Cu II species leads to the formation of Cu I species which can also participate significantly in termination with some, but not all, of the monomers studied. A theoretical trea…
Detailed studies of the dc and microwave conductivity and dielectric constant of the quasi-one-dimensional conductor, MEM(TCNQ) 2 for 4.2 K < T < 360 K are presented. Particular attention is paid to the strong first-order transition at 335 K where the conductivity jumps by about three orders of magnitude on heat…
Considerable experimental work has recently been reported on semiconductor-electrolyte interfaces in connection with the photoelectrolysis of water by illuminated n-type semiconductors. It is believed that surface states play an important role in charge transfer at the interface. In this paper the nature of that role…
The voltage distribution in a power transformer after a partial discharge has occurred is calculated. The results are compared with voltages, measured at the terminals of the transformer. A partial discharge prediction curve, based on the calculated capacitive distribution is constructed, by which the location of part…
Abstract The presence of low molecular weight molecules in a polymeric matrix often has a marked effect on material properties. Knowledge of specific penetrant distributions and component interactions is important for an elucidation of structure‐property relationships, plasticization phenomena, and any modification of…
A digital recorder has been developed for use in HV laboratories as a prospective replacement for conventional impulse oscilloscopes. The new apparatus has a sufficiently high time resolution to record the fastest microsecond impulses used for HV testing and also allows slower switching transients to be monitored.
Abstract The chemistry and technology of urethane elastomers has advanced rapidly since their inception in Europe in the late 1930'a and early 1940's. The earliest elastomers were Vulkollan, developed by I. G. Farbenindustrie (IGF) and Vulcaprene, developed by Imperial Chemical Industries (ICI). IGF developed a castin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal modification of freshly precipitated aluminum hydroxide by lithium ion intercalationMoshe Frenkel, Abraham Glasner, and Sara SarigCite this: J. Phys. Chem. 1980, 84, 5, 507–510Publication Date (Print):March 1, 1980Publication History Published online1 May 2002Publish…
The crystal structure of the potassium salt of dihydrouridine 3'-monophosphate hemihydrate, K+.CgH14 N209P-.½H20, a modified nucleotide, has been determined from three-dimensional X-ray crystallographic data. The nucleotide crystallizes in the space group C2 with unit-cell dimensions a = 22.638 + 0.007, b = 5.765 + 0.…
An improved apparatus for determining the fracture strength of brittle materials by a hydraulic bursting technique is described. The new design greatly reduces the number of specimens which fail at their edge and reduces the scatter in the results. To complement this, a more detailed theory is developed to analyse res…
The first application of n-Si as an efficient photoelectrode for the photoelectrolysis of water is reported. The Si surface has been coated with a thin layer of iron-oxide to overcome corrosion problems in an electrolyte. By using this heterostructure electrode as a photoanode in a photo-electrochemical cell, O 2 -evo…
The synthesis and characterization of the first nematic transition metal complex and of smectic complexes of the dithiene type are described.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal-nitroxyl interactions. 14. Bis(hexafluoroacetylacetonato)copper(II) adducts of spin-labeled pyridinesP. M. Boymel, G. R. Eaton, and S. S. EatonCite this: Inorg. Chem. 1980, 19, 3, 727–735Publication Date (Print):March 1, 1980Publication History Published online1 May 20…
Abstract Polyterephthalamides of high molecular weight (η inh up to 1.9) were obtained by the direct polycondensation reaction of terephthalic acid and aromatic diamines in the presence of poly(ethylene oxide) (PEO) with triphenyl phosphite in a N ‐methylpyrrolidone (NMP)–pyridine solution that contained lithium chlor…
The potential difference between grain boundary and bulk and the concentrations of native and foreign point defects in the bulk, the grain boundary ( gb ), and the subgrain boundary space‐charge region ( sg ) of polycrystalline Al 2 O 3 doped with acceptors are computed for the case that the dopants segregate at the g…