Materials Literature
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Abstract Die Filigrankorrosion ist eine besondere Art der atmosphärischen Korrosion, die bevorzugt auf lackierten Stahlblechen auftritt. Der Angriff beginnt mit der Ausbildung von Elektrolyttropfen, z. B. an hygroskopischen Verunreinigungen der Blechoberfläche und bleibt auf das kleine Volumen dieser Tröpfchen scharf…
Abstract Polysulfonamides may be prepared readily in high molecular weight by interfacial polycondensation. They are formed rapidly at room temperature when a disulfonyl chloride in an organic solvent is emulsified with a diamine in water containing an acid acceptor. The highest polymers have been obtained from alipha…
A study has been m ad e of the effect of dryin g a nd purification of polycaprolacta m (ny lon-6) on its thermal d ecomposition . The conclusions drawn from p reviou work, t hat a h ydrolytic mechanism is a t least p art iall y operating due to th e presence of water a nd ac id poly m er ization catalysts, are confirm…
Luminescence induced by Co60-gamma excitation of some organic solvent-solute pairs has been compared with 2537 A excitation as to dependence of intensity on solute concentration and on concentration of an added quencher. The solutions studied were 1,6-diphenylhexatriene in benzene, p-terphenyl in benzene, and p-terphe…
Article Synthesis and crystallography of the wurtzite form of silicon carbide was published on November 1, 1959 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 111, issue 1-6).
The magnetostriction constants λ 100 and λ 111 of Fe, 1.08 and 3.83% Si-Fe have been measured by using single crystals at temperatures below Curie point down to liquid air temperature with two newly designed apparatuses. In iron, λ 100 has a minimum around 400°K, while λ 111 monotonously decreases in numeral with incr…
The electrical conductivity of magnesium oxide at temperatures in the region of 1300°C is observed to depend upon the partial pressure of oxygen surrounding the sample. The conductivity increases at oxygen pressures both higher and lower than 10—5 atmospheres. At this pressure the conductivity is a minimum. This effec…
Films of uranium dioxide ranging in thickness from 132 to 280 mµ were evaporated onto fused silica, annealed at a pressure of 10−6 mm Hg and 960°C, and measured for optical absorption between the wavelengths of 210 and 800 mµ. A moderately intense band observed at 240 to 500 mµ has an unsymmetrical shape with a maximu…
The dependence of switching rate on the crystal thickness has been measured by Merz and explained by him in terms of a surface layer which has a low dielectric constant, and is about 10−4 cm thick. While not explicitly stated in Merz' original arguments, the layer must have a reversible polarization. If a layer withou…
The distribution of imperfections within the interior of crystals has been studied using ``projection topographs'' which are x-ray diffraction images showing a projection of a slice of crystal and the imperfections in it. Individual dislocations have been observed in single crystals of diamond, silicon, germanium, lit…
Abstract Chemical and clay mineralogical properties of Memphis, Grenada, Calloway and Henry series were determined and related to degree of internal drainage and genesis. Percent base saturation and other chemical data indicated that the more poorly drained profiles were more severely leached than better drained membe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh Energy Electron Irradiation of n-HexaneJean H. FutrellCite this: J. Am. Chem. Soc. 1959, 81, 22, 5921–5924Publication Date (Print):November 1, 1959Publication History Published online1 May 2002Published inissue 1 November 1959https://pubs.acs.org/doi/10.1021/ja01531a020…
Abstract The crystal structure of bis(glutaro-nitrilo)copper(I) nitrate has been determined by the two-dimensional Fourier method. It is tetragonal P\bar421c with two formula units in a cell of dimensions: a=8.25±0.01 Å and c=9.71±0.01 Å. The crystal consists of infinite two-dimensional networks of complex ion [Cu(NC–…
The large $p$-type surface conductivity and field-induced surface conductivity of the cleaned germanium surface have been measured over the temperature range 77\ifmmode^\circ\else\textdegree\fi{}-300\ifmmode^\circ\else\textdegree\fi{}K. It is found that the surface conductivit and the field-induced surface conductivit…
Abstract Polymer molecules are characterized by the unique structural feature of being composed of a large number of chain units covalently linked together. Despite this complexity of structure macromolecular systems still retain the ability to exist in different states, a property common to all substances. Two of the…
The purpose of this study was to try to find out why BaTiO 3 (essentially a cubic structure) can consistently be grown from KF solutions as large flat plates when a more equant morphology is expected. It is suggested that the size, shape, and perfection of the platelike “butterfly” twin crystals can be qualitatively r…
Abstract Experimental details are given for the interfacial polycondensation of thirteen polyamides having widely different structures. The method involves the fast, room‐temperature reaction in a two‐phase system between diamines and diacid chlorides. Aliphatic, alicyclic, and aromatic reactants, primary and secondar…
Abstract Reinforcement has been described as “the enhancement of one or more properties of an elastomer by the incorporation of some ingredient thus making it more suitable for a given application”. This definition gives an excellent qualitative description of the reinforcement of an elastomer, but lacks the quantitat…
Abstract High molecular weight polyterephthalamides were synthesized from a homologous series of primary diamines (ethylenediamine to hexamethylenediamine) by the interfacial polycondensation method. These polymers were found to be extremely high‐melting (300–450°C). and difficult to dissolve. Fibers were prepared by…
It is widely recognized that electron tube failures may be classified into two types: sudden and delayed. A mixture of two Weibull distributions, each representing one type of tube failure, is proposed, and a simple graphical method for estimating the parameters of the mixed Weibull distribution described.