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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Melting Temperature of Natural Rubber NetworksD. E. Roberts and L. MandelkernCite this: J. Am. Chem. Soc. 1960, 82, 5, 1091–1095Publication Date (Print):March 1, 1960Publication History Published online1 May 2002Published inissue 1 March 1960https://pubs.acs.org/doi/10.1…
The aqueous solubilities of 16 carefully purified disperse dyes have been measured over the temperature range 60–90°C. From these results, the heats of solution in water have been found to lie mainly in the range 10–20 kcal./mole. It is suggested that the higher heats of solution are associated with the presence of hy…
The scattering of electrons and x-rays by stacking faults is due to a phase change in the diffraction by crystal planes which do not lie parallel to the fault. A simple model of the process in copper estimates a resistivity p≃1 × 10−12 β ohm-cm for a total stacking fault density of β cm−1 on all planes. A wave matchin…
Earth-alkali oxides and bivalent transition-metal oxides will form compounds ABO 2 when the earth-alkali ion is large and the transition-metal ion is small.
Abstract Polymers prepared by the Macallum homopolymerization and copolymerization were compared to a linear phenylene sulfide polymer prepared by the self‐condensation of sodium p ‐chlorothiophenoxide. The properties compared included solubility, softening point, melting point, x‐ray diffraction pattern, infrared spe…
The crystallography of deformation twinning is formulated on a fresh mathematical basis. This leads to a simplified technique for calculating the reciprocal elements corresponding to a given pair of rational twinning elements. It is shown how the scale of homogeneity of the deformation may be deduced from macroscopica…
Sputtering ratios for copper have been determined in the energy ranges 5–40 kev for bombardment by Ar+, He+, and D+. Argon values range from 6.48 at 5 kev to 9.25 at 27.5 kev, deuterium from 0.048 at 10 kev to 0.023 at 44 kev, and helium from 0.23 at 15 kev to 0.75 at 40 kev. Preliminary data are included for 30-kev s…
Measurements have been made of the fluxes of thallous ions (Tl(+)) across the membrane of frog sartorius muscle fibers. These show that at an external concentration of 74 microM the influx is about 270 x 10(-15) moles/cm.(2) sec., while the efflux from a muscle with an internal concentration equal to the above is 5 x…
An autographic method is described for obtaining loadextension curves of ring specimens extended at various rates from about 0.1 to 2000% per second. Results showing the effect of the rate of extension on the tensile strength and breaking extension and on the load-extension curve are given for a GR-S gum vulcanizate a…
Annealing recrystallization has been produced in cold-strained single crystals of calcite, fine-grained undeformed aggregates, highly sheared aggregates, and in Yule marble deformed cold under controlled conditions. The critical temperature for recrystallization of Yule marble is about 500°C. In our limited experience…
The present paper points out that Kromm’s [1] plane-stress solution, for compressional waves in an infinite elastic plate subjected to radial pressure in a circular hole at its center, has application to still another problem of interest. This is the problem of a stretched elastic plate in which a circular hole is sud…
Abstract The metastable solubility isotherm for dicalcium phosphate dihydrate, CaHPO 4 ·2H 2 O, (DCPD), in the pH range 3.5 to 7.5 was established by (a) leaching solutions of dilute phosphoric acid through columns of DCPD, and (b) by shaking suspensions of DCPD in dilute phosphoric acid solutions. In other experiment…
A study has been made of the effect of 1 MeV electron irradiation on the mechanical properties of lithium fluoride single crystals tested in compression. The yield point, σ has been shown to vary with the irradiation dose, φ, according to the law σ=σ u +A[1-exp (-Bφ)]1/2, where σ u , A and B are constants. This relati…
The monoclinic 0-phase in the chromium-aluminium system has been shown to be isomorphous with a'(V-A1). The structure has been refined and the interatomic distances are discussed and compared with those in a'(V-A1) and with those in two ternary alloy phases containing chromium and aluminium.
Residual electrical resistivity has been used as an index of the damage present in tungsten irradiated in a nuclear reactor at 4°K and 77°K. A comparison was made between four different types of specimen prepared from cold-drawn wire respectively annealed before irradiation at 2000, 1500, 800°c and not at all. A fifth…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Preparation and Properties of Boron Phosphides and Arsenides1Forrest V. Williams and Robert A. RuehrweinCite this: J. Am. Chem. Soc. 1960, 82, 6, 1330–1332Publication Date (Print):March 1, 1960Publication History Published online1 May 2002Published inissue 1 March 1960ht…
Abstract Although the process of dolomitization is not well known at present, the requirement of conservation of mass of the chemical constituents of the rock and the interstitial solution places definite limits on the process. Most subsurface waters contain relatively small concentrations of bicarbonate compared to t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalyzed Hydrolysis of Sodium BorohydrideArthur. Levy, John B. Brown, and Carl J. LyonsCite this: Ind. Eng. Chem. 1960, 52, 3, 211–214Publication Date (Print):March 1, 1960Publication History Published online1 May 2002Published inissue 1 March 1960https://pubs.acs.org/doi/1…
Diffusion in a polycrystalline body is discussed under the assumption that two interrelated mechanisms consisting of diffusion through the grains and in the boundaries around the grains are dominant in different penetration regions. The general behavior of the average concentration-distribution of diffusant is describ…
Abstract The infrared spectra of doubly oriented films of mercerized ramie and Fortisan crystallites were observed over the 650–3600 cm. −1 frequency range. Polarization properties of the bands were determined. The CH 2 symmetric bending frequency was found to be parallel polarized, from which it was concluded that th…