Materials Literature
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Abstract This study explored the effects of chemical composition, extent of polyesterification and possible side‐reactions upon the rheological behavior of a variety of oil‐modified, glyceryl phthalate alkyds in both melt and in dilute solutions with several solvents. Correlative data were obtained on molecular weight…
Abstract Thirteen aliphatic and aromatic polyhydrazides have been converted as bulk polymer by a unique polymer by a unique polymer post reaction into high molecular weight poly(1,3,4‐oxadiazoles). This reaction proceeds by thermal cyclodehydration at 170–280°C. with elimination of water. The resulting poly(1,3,4‐oxad…
Summary: A membrane surrounding poly-β-hydroxybutyrate (PHB) granules isolated from both Bacillus cereus and B. megaterium has been demonstrated by the carbon-replica technique and electron microscopy. Some general features and properties of both the membrane and PHB granules are discussed.
The effect of various transition metal modifiers on the magnetic properties of iron-rhodium alloys was studied. The exchange inversion temperature Ts, residual magnetization, and maximum magnetization are dependent on the nature of the modifier and on the degree of substitution. As little as 2 at. % of Co, Ni, Cu, Nb,…
Abstract Sorption and fixation of microquantities of Cs by six minerals, as affected by the saturating cations, were studied. Micas and vermiculite sorbed more Cs in the presence of Ca and similar divalent cations than in the presence of K and similar monovalent cations. Montmorillonite and kaolinite, on the other han…
The properly cleaved silicon surface exhibits highly reproducible photoelectric properties, and is known from electron diffraction results to be of high structural perfection. The surface-atom rearrangement that occurs upon heating the cleaved (111) surface to 1000°K in vacuum causes marked changes in the electrical p…
The quantitative cleavage method for determining specific surface energies of solids is subject to several possible sources of error. Some of these are investigated analytically in this study, and a general expression for the surface energy is derived from beam theory for a linearly elastic material. The exact equatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Properties of Alkyl Amides. II. Liquid Dielectric Constant and LossS. J. Bass, W. I. Nathan, R. M. Meighan, and R. H. ColeCite this: J. Phys. Chem. 1964, 68, 3, 509–515Publication Date (Print):March 1, 1964Publication History Published online1 May 2002Published in…
The magnetic structures in FeCr2S4 and FeCr2O4 have been investigated by the powder neutron diffraction technique. From room temperature diffraction patterns, it is established that both compounds are normal spinels with sulfur and oxygen parameters u=0.384 and 0.386, respectively. The FeCr2S4 specimen exhibits a Néel…
The properties and composition of glasses suitable for crystallization of BaTiO 3 are described. The crystallization of certain glasses results in a nearly complete recovery of BaTiO 3 , besides the feldspar BaAl 2 SiO 3 as a minor phase. The mechanism of crystallization was investigated by thermal analysis, viscosity…
Ferromagnetism has been found in several divalent europium compounds. Some of these materials are particularly simple in both crystal and magnetic structure and are ideal for experimental and theoretical study. The materials we have investigated can be divided into three groups, europium chalcogenides, europium haloge…
Summary The Q/I relations of labile soil K relate its availability or intensity (I) to the amount (Q) present. The activity ratio a K /√(a Ca ±Mg) has already been proposed as a measure of the intensity factor (part I). The ability of a soil to maintain the activity ratio against depletion by plant roots is governed p…
Magnetic and electric properties of some single crystals of complex composition of perovskite-type structure were investigated and coexistence of ferroelectric and antiferromagnetic properties was shown in them. It was found that single crystals YMnO3 and YbMnO3 of the new class of ferroelectrics, discovered by Bertau…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect Titration of Epoxy Compounds and Aziridines.R. R. JayCite this: Anal. Chem. 1964, 36, 3, 667–668Publication Date (Print):March 1, 1964Publication History Published online1 May 2002Published inissue 1 March 1964https://pubs.acs.org/doi/10.1021/ac60209a037https://doi.or…
The ionic conductivity of cubic solid solutions in the system CaO ‐Y 2 O 3 ‐ZrO 2 was examined. Particular Y 2 O 3 ‐ZrO 2 binary compositions were more conductive at elevated temperatures (>600°C) than either CaO‐ZrO 2 binary or CaO‐Y 2 O 3 ‐ZrO 2 ternary compositions. The higher ionic conductivity appears to be re…
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