Materials Literature
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Abstract The polymerization and the polymerizabilities of indene, benzofuran, and 1,2‐dihydronaphthalene are discussed from the point of view of ring strain, ring stabilization, and steric hindrance in the transition state. Monomer reactivities of these olefins were estimated from copolymerization with styrene and fro…
Abstract Dimethyl‐, trifluoropropyl‐, and high phenyl content polysiloxanes were irradiated in a 60 Co source to doses of 100 Mrad. The hardness of the specimens increased with dose. Crosslink density changes did not directly reflect the hardness changes. The crosslink density of the dimethyl polymer increased signifi…
Abstract Linear polymers containing oxazolidone rings in the main chain were prepared from difunctional urethans and epoxides by the synthetic method previously used for reaction of monofunctional urethans and epoxides. The similarity of the infrared spectra of polymers and model compounds, bisoxazolidones, showed the…
Abstract The copolymerization of ethylene with maleic anhydride was carried out with γ‐radiation and a radical initiator, i.e., 2,2′‐azobisisobutyronitrile and diisopropyl peroxydicarbonate under pressure at various reaction conditions. The homopolymerization of neither monomer was observed in this system. In the γ‐ra…
The dislocation density of slowly cooled, zone-refined aluminium single crystals, made by the strain-anneal method, has been studied, using Lang's x-ray diffraction topography technique. Three supplies of aluminium were used. The dislocation density in crystals from two of the supplies was found to be approximately li…
Magnetization curves along the c-axis of natural pyrrhotite crystal (Fe 7 S 8 ) are measured in high magnetic field (up to about 100 kOe) from room temperature down to liquid helium temperature. By means of the X-ray method, it is also confirmed that the ordered arrangement of vacant sites and ions has no temperature…
A test method to determine the minimum dynamic tensional stress required to rupture materials that have a high compressive strength and a relatively low tensile strength is evaluated. The test loading is by impact from an air-fired projectile. The loading device utilizes a 250-gram projectile, and can produce an impac…
A satisfactory method has been developed for the determination of quantum yields for the photochemical cyclization reactions of aromatic azo compounds in strongly acidic solutions. With the three azobenzenes selected for study there was no direct correlation between the quantum yields of the cyclization reaction and H…
Abstract Bulk compressibilities of a series of linear and crosslinked polymers have been measured, in a Matsuoka‐Maxwell apparatus, at pressures up to 10,000 atmospheres and at temperatures to 202°C. These polymers exhibited nonlinear compressibility characteristics and a maximium compressibility of about 15% at 10,00…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTetra(alkylsilicon) HexachalcogenidesJ. A. Forstner and E. L. MuettertiesCite this: Inorg. Chem. 1966, 5, 4, 552–554Publication Date (Print):April 1, 1966Publication History Published online1 May 2002Published inissue 1 April 1966https://pubs.acs.org/doi/10.1021/ic50038a012h…
The positions of the metal ions in the spinel-type structures of compds. of the type MntFe3-tO4 in the region 0.25 <t <1.50 were detd. by the method of Skolnick, et al., (CA 52, 9750h) which employs the diffraction of x-rays of different wavelengths. After a single-phase spinel has been formed by solid-s…
Abstract The rate of isomerization during the polyesterification of maleic acid or maleic anhydride depends on the structure of the glycol used: the longer the chain of the glycol, the lower the isomerization rate. The rate constants differ greatly from one case to another. Thus, the difference in the reaction rate co…
Abstract The degradation of phenol–formaldehyde polycondensates has been investigated by mass spectrometric thermal analysis to 800°C. The thermal oxidative mechanism proposed by Conley and co‐workers has been confirmed. Direct analysis of products at frequent intervals of a temperature‐programmed heating cycle demons…
The influence of cell age, cell size, cell shape, and mode of colony formation on the sinking rates of Bacteriastrum hyalinum Lauder and Chaetoceros lauderi Ralfs was investigated in 18 experiments. The mean sinking rate of B. hyalinum ranged from 0.39 to 1.27 m/day; the absolute minimum and maximum rates were 0.24 an…
Isothermal annealing before or after irradiation is found to have a definite effect upon the thermoluminescent glow curve of LiF (TLD-100). Post-irradiation annealing, by thermally releasing electrons from their traps, reduces the size of each peak in the glow curve. The two main dosimetry peaks each have a simple exp…
X-ray diffraction measurements on anisotropic polycrystalline samples give a set of functions (pole-figures) describing the orientation distribution of individual plane-normals. From the set of these plane-normal distributions it is possible to deduce the orientation distribution of all crystallites in the sample (inv…
Abstract Many rigid PVC compounds show a sharp transition from tough to brittle fracture with decreasing temperature in impact testing, and this temperature becomes a criterion of compound quality in addition to the impact strength observed at specific temperatures. This BT (brittle fracture) has been investigated ind…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRates and Isomer Distributions for the Mercuration of the Monohalobenzenes in Trifluoroacetic Acid. Partial Rate Factors for the Mercuration Reaction1-3Herbert C. Brown and Robert A. WirkkalaCite this: J. Am. Chem. Soc. 1966, 88, 7, 1456–1458Publication Date (Print):April 1,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Optical Properties of Bis(toluene-3,4-dithiolato)silicon(IV), -germanium(IV), -tin(IV), and -lead(IV)Frank Hall Fink, J. A. Turner, and Dwight A. Payne Jr.Cite this: J. Am. Chem. Soc. 1966, 88, 7, 1571–1572Publication Date (Print):April 1, 1966Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of Disodium Terephthalate in Aqueous Solutions of Sodium Carbonate and Sodium Bicarbonate.J. L. Ellingboe and J. H. RunnelsCite this: J. Chem. Eng. Data 1966, 11, 2, 185–187Publication Date (Print):April 1, 1966Publication History Published online14 June 2008Pub…