THERMAL DECOMPOSITION OF SODIUM AZIDE CRYSTALS
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Dielectric Properties of Glasses in the Systems Bi 2 O 3 ‐CdO‐SiO 2 , Bi 2 O 3 ‐CdO‐B 2 O 3 , and Bi 2 O 3 ‐CdO‐GeO 2 and Their Relation to the Structure of Glass
Areas of glass formation and regions of “neo‐ceramic” glasses in the systems Biz03‐CdO‐Si02, Bi203‐Cd0‐B203, and Bi203‐Cd0‐GeO2 are demarcated. Properties of glasses in the neoceramic regions were determined before and after nucleation and heat treatment. There are no maxima or minima in the dielectric properties vers…
Inertial Impaction on Single Elements
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInertial Impaction on Single ElementsM. N. Golovin and A. A. PutnamCite this: Ind. Eng. Chem. Fundamen. 1962, 1, 4, 264–273Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published inissue 1 November 1962https://pubs.acs.org/doi/10.1021…
Fluorinated Cyclic Polysulfides and Their Polymers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorinated Cyclic Polysulfides and Their PolymersC. G. Krespan and W. R. BrasenCite this: J. Org. Chem. 1962, 27, 11, 3995–4000Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published inissue 1 November 1962https://pubs.acs.org/doi/10…
Interfacial polycondensation. XII. Variables affecting stirred polycondensation reactions
Abstract Preceding papers have described the preparation of many polymers in high molecular weight by interfacial polycondensation under a wide variety of conditions. This paper reports an extended study of the optimum conditions for the stirred preparation of poly (hexamethylene sebacamide) and poly(sebacyl piperazin…
Carbodiimides. II. Mechanism of the Catalytic Formation from Isocyanates
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbodiimides. II. Mechanism of the Catalytic Formation from IsocyanatesJohn J. Monagle, Tod W. Campbell, and Herbert F. McShaneCite this: J. Am. Chem. Soc. 1962, 84, 22, 4288–4295Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Publishe…
Infrared Reflectance of Evaporated Aluminum Films
The specular reflectance of evaporated aluminum films has been measured with high precision (±0.1%) from 0.55 to 32 μ. The measurements were made at normal incidence on fresh and aged films deposited on fuzed quartz substrates with rapid evaporation rates at pressures of about 1×10−5 Torr. The dependence of the reflec…
Degradation of Polymers
Abstract Recent literature pertaining to both the theoretical aspects and experimental results of the degradation of polymers by heat and radiation is reviewed and critically evaluated. Theories of random and chain thermal degradation of vinyl polymers and co-polymers are reviewed. The degradation of polymethacrylates…
A Study of the Negative Staining Process
SUMMARY: The effectiveness of a number of different materials in the negative staning method for electron microscopy of viruses is evaluated. Shadowing was used to study the degree of distortion suffered by the specimen. Changes in pH value which occurred while the negative staining solution was trying were measured i…
Lattice Vibrations in Pyrolitic Graphite
The dispersion relation for the longitudinal acoustic lattice waves propagating in the direction of the hexad axis in (pyrolitic) graphite, at room temperature, has been determined by neutron spectrometry. The dispersion curve has very closely the form of a sine curve, with a maximum frequency of (3.84\ifmmode\pm\else…
The Science and Technology of Silicone Rubber
Abstract This is a review of silicone rubber and challenging it is since the silicones, a relatively new group of completely synthetic materials, are growing very rapidly even when viewed against today's rapidly advancing technology. The silicones bring together something of the properties of inorganic materials with…
Pyrolytic Graphites: Their Description as Semimetallic Molecular Solids
This paper is concerned with an investigation of the electrical,the galvanomagnetic, and the thermoelectric properties of pyrolytic graphites whose morphological features are conditioned by the deposition temperature, the heat treatment, and the doping level. (1) Basal-plane magnetoresistance and c-direction specific…
Studies in the System CaCO3-MgCO3-FeCO3: 1. Phase Relations; 2. A Method for Major-Element Spectrochemical Analysis; 3. Compositions of Some Ferroan Dolomites
Isothermal sections at 600°, 650°, 700°, 750°, and 800° C, run for the most part at 15 kilobars total pressure, were obtained using a squeezer-type apparatus. Above approximately 675° C. the system contains two two-phase and two single-phase areas. One single phase region extends a short distance into the ternary syst…
Pure aragonite synthesis
By slow removal of CO2 from Ca(HCO3)2 solution containing MgCl2 at room temperature, pure and homogeneous aragonite crystals were obtained. During the crystal syntheses, labeling with either or both C14 and Ca45 was feasible.
Phase equilibrium relations in the binary system bismuth sesquioxide-niobium pentoxide
The phase equilibrium diagram for the binary system bismuth sesquioxide-niobium pentoxide has been constructed from observations of fusion characteristics and X-ray diffraction data. In the system five binary compounds were observed with Bi(2)O(3):Nb(2)O(5) ratios of 5:3, 1:1, 4:9, 1:5, and 1:6. The 1:1 compound was f…
Internal field emission in carbon black‐loaded natural rubber vulcanizates
Abstract The nonohmic behavior of carbon black‐loaded natural rubber viilcanizates was studied. Three samples contained high‐abrasion furnace black (HAF) in good, moderate, and poor dispersion. Another sample contained a good dispersion of medium thermal black (MT). The nonohmic behavior of the poor HAF dispersion and…
X‐ray and related studies of quenched, drawn, and annealed polypropylene
Abstract A variety of metastable conditions can be produced in polypropylene of normal commercial tacticity by quenching, cold drawing, and annealing. The resultant x‐ray patterns suggest a two‐component three‐phase model of the molecular organization, and such a model has suffcient scope to produce good agreement bet…
Crystallographic Data for New Rare Earth Borate Compounds, RX3(BO3)4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallographic Data for New Rare Earth Borate Compounds, RX3(BO3)4A. D. MillsCite this: Inorg. Chem. 1962, 1, 4, 960–961Publication Date (Print):November 1, 1962Publication History Published online1 May 2002Published inissue 1 November 1962https://pubs.acs.org/doi/10.1021/…
Infrared Study of the Adsorption of Methanol and Ethanol on Aluminum Oxide
The adsorbed surface species which result when aluminum oxide is exposed to methanol or ethanol vapor have been studied. Three different surface species have been identified for both methanol and ethanol. At 35°C a weakly bound layer of liquid alcohol is observed, which is removed by evacuation. Another species which…
Optical and Mechanical Anisotropy in Crystalline Polymers
Expressions have been derived for the optical birefringence and elastic moduli of an idealized semicrystalline polymer in terms of the molecular orientation. The predicted birefringence and moduli show qualitative agreement with previous experimental data for polyethylene at low extension ratios. A result of particula…