Materials Literature
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Abstract A versatile instrument, The Static Propensity Tester, was constructed for the measurement of the rate of electrostatic charge build up and decay on polymer films and fabrics. The tester was used for measuring the rates of both positive and negative potentials in the voltage range of 1000–10,000 volts. From su…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions Of Boron Trichloride With Organic CompoundsW. Gerrard and M. F. LappertCite this: Chem. Rev. 1958, 58, 6, 1081–1111Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.acs.org/doi/10.10…
Time and field dependence of switching current at room temperature was studied for tri-glycine fluoberyllate as well as for tri-glycine sulfate. It is shown that the theory describing polarization reversal in BaTiO3 c-domain crystals based on observed time and field dependence of polarization P=f(E,t) developed by the…
Abstract Starting from the assumption that a polymer molecule in solution will only degrade under the influence of ultrasonic irradiation if both the resulting fragments are greater than P e /2 in size, where P e is the so‐called limiting degree of polymerization, rela tionships are derived giving the rate of degradat…
A new technique for growing single crystals of CdS and ZnS has been devised in which single crystals up to 115 g in weight are obtained. The conversion of sphalerite into wurtzite and vice versa is described. The growth mechanism of the single ZnS crystals is described and compared with that for CdS crystals previousl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effects of Ionizing Radiation on Natural and Synthetic High Polymers.Malcolm DoleCite this: J. Am. Chem. Soc. 1958, 80, 24, 6694Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.acs.org/do…
The equilibrium stability temperatures of various micas were determined and compared at the same water pressure. Dioctahedral minerals are considerably less stable thermally than trioctahedral phases. Substitution in the octahedral layer of Ni (super 2+) for Mg (super 2+) makes very little difference, and Ga (super 3+…
Overstressed U-bends of Types 304 and 347 stainless steels were exposed to water containing chloride ions to determine the susceptibility of these steels to stress corrosion cracking between the temperatures of 165 F and 200 F. The pH was controlled at 6.5 to 7.5 and 10.6 to 11.2 for the tests. At the high pH, cracks…
A method is described for the determination of possible space groups for pseudosymmetric structures, i.e. structures derived from an idealised structure of higher symmetry by small displacements of the atoms from special positions. Conventionally, systematic absences are used to infer the presence of symmetry operator…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperiments with 4-Thiopyrones and with 2,2',6,6'-Tetraphenyl-4,4'-dipyrylene. The Piezochromism of DiflavyleneAlexander Schönberg, Mohamed Elkaschef, Michael Nosseir, and Mahmoud Mohamed SidkyCite this: J. Am. Chem. Soc. 1958, 80, 23, 6312–6315Publication Date (Print):Decem…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Effects of Molecular Weight on the Crystallinity of PolyethyleneL. J. Tung and S. BuckserCite this: J. Phys. Chem. 1958, 62, 12, 1530–1534Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.…
A relaxation method is used to adjust the thicknesses of the films of a multilayer in order to alter its transmission characteristics in a limited spectral region. This method is used to modify the spectral transmission of a short-wavelength pass multilayer and a broad-band dielectric mirror. The computations also fur…
It was known that solubility of irradiated polymers was not free from the effect of cyclization. On the contrary, viscosity before gel point is not affected by it and it is utilized in order to investigate the effects of high energy radiation on polymers. Intrinsic viscosity is discussed first for the case where cross…
Abstract The calcination of calcium hydroxide and of calcium carbonate (precipitated or prepared from calcium oxalate monohydrate) has been studied by determining the changes occurring in the specific surface and lattice structure during each decomposition in vacuo or in air at a series of temperatures up to 900° or 1…
The solubility and solution rates of porous glass and silica gel in nitric acid solutions at 95°, 65°, and 36° C. were determined. The solubility depends on the acid concentration, decreasing with increasing strength of free HNO 3 in accordance with the following equation: log C = ‐aN ‐ b , where C is the silica solub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfrared Spectra and Strain in Cyclic Carbonyl CompoundsH. K. Hall Jr. and R. ZbindenCite this: J. Am. Chem. Soc. 1958, 80, 23, 6428–6432Publication Date (Print):December 1, 1958Publication History Published online1 May 2002Published inissue 1 December 1958https://pubs.acs.o…
Using neutron diffraction data, the crystal structure of gypsum has been refined by Fourier and least squares methods. The hydrogen bond distance was found to be 2.82 A rather than 2.71 A, reported previously. The hydrogen positions are consistent with those obtained from nuclear magnetic resonance. The O–H distance i…
The nonequilibrium limit of random crystallization of linear high polymers is described in this article. Expressions for crystallite size, surface area, crystallinity, and amorphous sequence distribution of crystallizable repeating units in random copolymers after cold crystallization are derived. Melting points and c…
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