Materials Literature
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Abstract During the course of an investigation of polyamide series it became necessary to obtain more ample knowledge of the structure of a polyamide with odd number of CH 2 groups. As an example of this series the crystal structure of polyheptamethylene pimelamide (nylon 77) has been determined by X‐ray analysis acco…
Tensile strength and tearing strength are discussed separately. A relation between cloth tensile strength, yarn strength and the parameters of cloth construction and yarn construction is suggested. Tearing strength is shown to be dependent mainly on the spacing and strength of the threads being torn and the force requ…
Abstract The dissolution of monocalcium phosphate monohydrate (MCP) in water was followed over a 17‐day period; and the resulting solution was compared with solubility isotherms of the system CaO‐P 2 O 5 ‐H 2 O at 25°C. Shaking excess MCP with water at room temperature resulted in rapid dissolution during the first fe…
Highly conducting ion exchange polymers can be employed as solid electrolytes in batteries. Their resistivities are intermediate between aqueous electrolytes and the usual inorganic solid electrolytes. Cells containing pairs of metal electrodes behave reversibly. Their emf's form an additive series for the examples te…
THE THERMAL DECOI'OSITI0N OF NESQUEHONITE MgCO3 THE THERMAL DECOI'OSITI0N OF NESQUEHONITE MgCO3 3H20 AND MAGNESIUM AMMONIUM CARBONATE 4H2O BY R. M. DELL* AND S. W. WELLERt Houdry Process Corporation, Marcus Hook, Pa., U.S.A. Received 25th February, 1959 A study has been made of the thermal decomposition
Determination of the phase relationships on the join by the quench method has enabled the previously designated "gamma zinc phosphate" to be identified as a solid solution of zinc orthophosphate in magnesium orthophosphate. takes 95 mole % into solid solution at 1000°C. takes a small amount of into solid solution (abo…
The nickel – nickel oxide electrode forms the positive plate in the charged nickel–cadmium battery. After "charging" the electrode to a chemical state represented by the non-structural formula NiO x , where x can vary from about 1.4 to 1.8 depending on the current density and temperature, loss of oxygen and a fall of…
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J. A. Kitchener and C. F. Cooper, Q. Rev. Chem. Soc., 1959, 13, 71 DOI: 10.1039/QR9591300071
L. E. Orgel, J. Chem. Soc., 1959, 3815 DOI: 10.1039/JR9590003815
D. H. Richards and M. Szwarc, Trans. Faraday Soc., 1959, 55, 1644 DOI: 10.1039/TF9595501644
Abstract A torsion pendulum has been used to measure the internal friction of polytetrafluoroethylene. The crystallinity of the specimens varied form 48 to 92%, and the measurements were made over a wide temperature range. The site of each relaxation was assigned by observing the variation of relaxation strength and p…
Alloying of titanium with small amounts of noble metals markedly improves its corrosion resistance in reducing‐type acids without any impairment of its high resistance to oxidizing media. The mixed potentials of titanium noble metal alloys are more noble than the critical potential for passivity of titanium in the sam…
Surface‐tension data are reported for liquid Al 2 O 3 , B 2 O 3 , GeO 2 , P 2 O 5 , and SiO 2 . Abnormal positive temperature coefficients for B 2 O 3 , GeO 2 , and SiO 2 are shown to be due mainly to changes in the liquid structure (dissociation) with temperature.
N. S. Gill and R. S. Nyholm, J. Chem. Soc., 1959, 3997 DOI: 10.1039/JR9590003997
Abstract A theoretical treatment is given which predicts the behavior of a foamed elastic material on the basis of a model consisting of a network of thin threads. Two cases are considered: ( 1 ) small strains, and ( 2 ) finite compressions, when the major part of the deformation of the threads is attributed to buckli…
C. G. Barraclough, J. Lewis and R. S. Nyholm, J. Chem. Soc., 1959, 3552 DOI: 10.1039/JR9590003552
Reflectances of non-opaque aluminium films were measured from the substrate side as a function of angle of incidence. For the p-polarization there is a maximum reflectance near the critical angle for the substrate; for a certain range of Al thicknesses this is followed by a sudden drop which can be to zero reflectance…
The kinetics of the etching of silicon in the system HF , HNO 3 , and H 2 O was studied as a function of the composition of the etchant at 25°C. A triaxial plot of the etch rate vs. composition of the etchant shows two extreme modes of behavior. In the region of high nitric acid compositions, etch rates are functions…
In the research reported here an attempt has been made to discover by experiment what physical assumptions and approximations are appropriate in the theory of cavitation microstreaming, especially for cavitation bubbles located near solid boundaries. A systematic investigation of the phenomenon has been made and its d…