Materials Literature
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Small- and wide-angle X-ray investigation of drawing and annealing of polypropylene quenched films in wide ranges of draw ratio (λ = 1-20) and of temperature (20°-150°C) shows the discontinuity of the elementary act of transformation in the microneck of the original lamella of the microspherulitic into the microfibril…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilyl-proton exchange reactionsJohann F. KlebeCite this: Acc. Chem. Res. 1970, 3, 9, 299–305Publication Date (Print):September 1, 1970Publication History Published online1 May 2002Published inissue 1 September 1970https://pubs.acs.org/doi/10.1021/ar50033a003https://doi.org/1…
Electronic transitions in B i–B iv have been studied with the beam-foil technique. Over 100 spectral lines were observed between 450 and 5000 Å. Only half of the lines could be assigned to earlier known boron transitions. Classifications are given for several of the new lines. Mean lives of 33 excited levels in B i–B…
Abstract The rubber phase volume (rubber + occluded polystyrene) can be widely varied in impact polystyrene by controlling the rate of agitation during polymerization. The tensile modulus and magnitude of the rubber phase mechanical loss transitions are related to the degree of polystyrene occlusion. It is shown that…
The lattice parameter of AlAs has been very accurately measured as a function of temperature between 15° and 840°C, and the coefficient of thermal expansion has been determined. The lattice parameter at 0°C is 5.6605±0.0005 Å and the coefficient of thermal expansion is (5.20±0.05) ×10−6/°C. A comparison is made to GaA…
Resistivity and magnetoresistance data obtained from 77 to 700 °K are presented. These data suggest an interpretation based on a strongly spin-polarized conduction band. A model is developed based on this interpretation which can consistently describe the present data and previously published data.
Abstract High‐density commercial polyethylenes have been crystallized under the combined orientation and pressure effects available in the Instron capillary rheometer. The samples so formed were found to have a high degree of crystal perfection and crystal orientation in combination with the unusual property of transm…
Fresh UN powder of a medium particle size (0.3 m2/g) prepared by nitridation of U powder was exposed to O2 at room temperature in a constant volume apparatus. Oxidation was followed by pressure measurement. Under O2 pressures higher than 3 mmHg the powder ignited instantaneously, probably due to local heating in the s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTJOINT COMMITTEE ON POWDER DIFFRACTION STANDARDSCite this: Anal. Chem. 1970, 42, 11, 81APublication Date (Print):September 1, 1970Publication History Published online23 May 2012Published inissue 1 September 1970https://doi.org/10.1021/ac60293a779RIGHTS & PERMISSIONSArticle Vi…
One of the major problems associated with the use of substituted benzylideneaniline type liquid crystals is their relative instability to cleavage or reaction of the anil linkage. Many workers have noted the presence of ubiquitous impurities in these materials which influence the reproducibility of the phase transitio…
Abstract Ionic conduction in polymer films is of two types. Inverse conduction, I , occurs when the resistance runs counter to that of the external solution, and Direct conduction, D , when the resistance follows that of the external solution. The distribution of areas having D properties has been established for film…
Cathodoluminescence (CL) and x-ray emission excited by an electron microprobe in In1−xAlxP at ∼300°K have been monitored simultaneously to yield conduction band structure and alloy composition, respectively. Efficient single-line CL, characteristic of direct bandgap recombination, is observed for x between 0.0 and alm…
Magnetic anisotropy, magnetization, and average magnetic susceptibility have been measured for iron (II) phthalocyanine. The anisotropy was measured from the room temperature to about 90°K, the average susceptibility from 296 to 1.57°K, and the magnetization was measured at 1.57°K for field strengths between 1100 and…
The solutions to four classical problems in dynamic plasticity—the circular plate under uniform pressure, the reinforced circular cylindrical shell under uniform pressure, the free-free beam with a central concentrated force, and the circular cylindrical shell with a ring load—are examined to determine the effect of p…
Measurements are reported of magnetization and the average magnetic susceptibility of manganese (II) phthalocyanine in the range 1.7–300°K, which confirm that the Mn(II) atom is in an S = 3 / 2 spin state, and that weak ferromagnetic interactions are present in the crystal, presumably between adjacent molecules. Singl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic Polyesters with Large Cross-Planar SubstituentsP. W. MorganCite this: Macromolecules 1970, 3, 5, 536–544Publication Date (Print):September 1, 1970Publication History Published online1 May 2002Published inissue 1 September 1970https://pubs.acs.org/doi/10.1021/ma60017…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBinding of copper(II) to potentially tridentate amino acid ligandsEdmond Woodrow Wilson Jr., Mary H. Kasperian, and Robert Bruce MartinCite this: J. Am. Chem. Soc. 1970, 92, 18, 5365–5372Publication Date (Print):September 1, 1970Publication History Published online1 May 2002…
Summary A brief survey is given of the physical properties of the rare earth metals. In doing this their characteristic structural and magnetic behaviour is described first and this is then followed by an examination of the ways in which these features affect the other properties.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOligomeric silsesquioxanes, (HSiO3/2)nCecil L. Frye and Ward T. CollinsCite this: J. Am. Chem. Soc. 1970, 92, 19, 5586–5588Publication Date (Print):September 1, 1970Publication History Published online1 May 2002Published inissue 1 September 1970https://pubs.acs.org/doi/10.10…
Abstract Review of literature, allogenic and authigenic clays, conditions of formation from geologic and geochemical points of view