Materials Literature
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Abstract A new crystalline form of polyoxymethylene is described with an orthorhombic unit cell, space group P 2 1 2 1 2 1 , and lattice constants a = 4.77 A., b = 7.65 A., c = 3.56 A. The chains are helicoidal with the axis of the helix parallel to c . The period of identity of 3.56 A. comprises two monomeric units a…
Abstract Polymorphism present in the even nylons has been accounted for in terms of parallel and antiparallel packing of the polyamide chains. Hydrogen bonding appears to play the most important part in governing chain packing. For example, in the antiparallel structure (alternate chains running in opposite directions…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation States of Manganese Hematoporphyrin IX in Aqueous Solution*Paul A. Loach and Melvin CalvinCite this: Biochemistry 1963, 2, 2, 361–371Publication Date (Print):March 1, 1963Publication History Published online1 May 2002Published inissue 1 March 1963https://pubs.acs.o…
Abstract Mica‐type layer‐silicates such as montmorillonite and vermiculite are capable of exchanging their cations for other (including organic) cations, just like the zeolites. These derivatives swell in a variety of liquids. This paper presents a survey of the structures of organic derivatives of mica‐type layer‐sil…
Vibrational distribution functions are derived for a number of rocksalt-structure alkali halides using a more refined treatment of the interionic forces than that provided by regarding them as rigid point charges. The dipole moment at any given ion site is calculated taking into account the contribution from the defor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTRIMETHYLALUMINUM: THERMODYNAMIC FUNCTIONS IN THE SOLID AND LIQUID STATES, 0-380°K.; VAPOR PRESSURE, HEAT OF VAPORIZATION, AND ENTROPY IN THE IDEAL GAS STATE1J. P. McCullough, J. F. Messerly, R. T. Moore, and S. S. ToddCite this: J. Phys. Chem. 1963, 67, 3, 677–679Publicatio…
Abstract The rate of permeation of hydrogen through a highly purified iron (Ferrovac E) was measured over a pressure range of 1/30 to 300 atm. and a temperature range of 126° to 693°C. The effect of cold working of the annealed metal and of hydrogen purity were also studied. Permeability, diffusivity, and solubility w…
The yield of secondary electrons ${\ensuremath{\gamma}}_{n}$, from cleaned surfaces of polycrystalline molybdenum has been measured for argon neutral atoms (${\mathrm{Ar}}^{0}$) in the energy range 500-2500 eV. The values of ${\ensuremath{\gamma}}_{n}$ thus obtained are compared with ${\ensuremath{\gamma}}_{i}$, the y…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTHERMOPHYSICAL PROPERTIES OF THE LANTHANIDE OXIDES. III. HEAT CAPACITIES, THERMODYNAMIC PROPERTIES, AND SOME ENERGY LEVELS OF DYSPROSIUM(III), HOLMIUM(III), AND ERBIUM(III) OXIDES1Edgar F. Westrum Jr. and Bruce H. JusticeCite this: J. Phys. Chem. 1963, 67, 3, 659–665Publicat…
X-ray- and uv-excited thermoluminescence in natural quartz has been investigated by studying the properties of synthetic samples. The results for a large number of natural samples, including single crystals, outcrop specimens, and core-hole samples showed that most of them had four prominent glow peaks in common. One…
Evidence is presented which suggests that the true gel phase in natural rubber is composed of small crosslinked latex particles (microgel), whose presence is revealed by light scattering and by electron microscopy. These are combined into a matrix with soluble rubber molecules, forming the apparent gel phase. The rate…
Goldstein, Solomon. (Brooklyn Coll., Brooklyn, N.Y.) Development and nutrition of new species of Thraustochytrium. Amer. Jcur. Bot. 50(3): 271‐279. Illus. 1963.—The life cycles of 2 lower Phycomycetes in sea‐water‐pollen culture are described and compared with variations observed in nutrient media. Some ecological imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntrinsic Cotton Effects In Collagen And Poly-L-ProlineE. R. Blout, J. P. Carver, and J. GrossCite this: J. Am. Chem. Soc. 1963, 85, 5, 644–646Publication Date (Print):March 1, 1963Publication History Published online1 May 2002Published inissue 1 March 1963https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDILUTE SOLUTION PROPERTIES OF BRANCHED POLYMERS. POLYSTYRENE TRIFUNCTIONAL STAR MOLECULES1T. A. Orofino and Franz WengerCite this: J. Phys. Chem. 1963, 67, 3, 566–575Publication Date (Print):March 1, 1963Publication History Published online1 May 2002Published inissue 1 March…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNegative Ions of Porphin Metal ComplexesG. L. Closs and L. E. ClossCite this: J. Am. Chem. Soc. 1963, 85, 6, 818–819Publication Date (Print):March 1, 1963Publication History Published online1 May 2002Published inissue 1 March 1963https://pubs.acs.org/doi/10.1021/ja00889a038h…
Abstract The effects of temperature, detergents, electrolyte, agitation and fabric structure on the removal from cotton of octadecane, tripalmitin, stearyl alcohol and stearic acid labelled with carbon‐14 have been studied. The following mechanisms appear to be operative in the removal of these materials: (1) the roll…
Abstract A study has been made of the mechanics of mixing of carbon black in rubber by determining the influence of agglomerates in the mix on the final properties of the vulcanizate. It is suggested that the mixing starts with the forming of soft agglomerates which contain polymer and black in about the proportion of…
A differential thermal analysis technique was used to study the carbothermic reduction of aluminum oxide at reduced pressures in the temperature range 1700–2200 °K. The reduction was found to proceed through the intermediate oxycarbide Al 4 O 4 C, identified by previous workers, to the aluminum carbide. The Al 4 O 4 C…
The condensed‐state reaction between single crystals of Al 2 O 3 and MgO was conducted in air at 1560°C. Spinel formed as two product layers which were shown to agree with the proposed mechanism. The crystallographic orientation of the parent crystals had no effect on the rate of spinel growth. The orientation of the…
By A. J. Ellis. The solubility of calcite in natural hydrothermal solutions was found to be significantly higher than in salt solutions of comparable ionic strength. Complexing of calcium with silica is suspected.