Materials Literature
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Residual thermal stresses are present in cross-plied graphite-epoxy composites due to the anisotropic thermal and mechanical properties of the individual layers. Experimental measurements and analytical calculations of the thermal stress induced in two different cross-plied composites during fabrication are presented…
For K2MoO4, K2WO4, Rb2MoO4, and Rb2WO4, the transition temps. are 305 and 440 Deg; 370 and 435 Deg; 230 and 550 Deg; and 295, 390, and 465 Deg, resp. Their isomorphism, and calcd. cell consts. of the occurring phases are given. [on SciFinder (R)]
Abstract The crystal structure of nylon 3 was studied, and four crystalline modifications were observed. Modification I, as determined from the x‐ray diffraction pattern of drawn fibers, is similar to the α crystal structure of nylon 6. The unit cell is monoclinic; a = 9.33 Å, b = 4.78 Å, (fiber identity period), c =…
A relation is discussed from which a Grüneisen parameter γG can be calculated if the thermal conductivity κ with respect to pressure p and the bulk modulus B are known. The relation, γG(κ) = B (∂ lnκ / ∂p)T − 13, is analogous to the widely known expression, γG(s) = B∂(∂ lns / ∂p)T + 13, which is used to obtain a Grüne…
The spectroscopic features of crystals of the scheelite-structure lithium yttrium fluoride (LiYF4) doped with Nd3+ and Yb3+ have been measured at 300°K. The energy-transfer properties of Nd3+→Yb3+ in this host have been studied and compared with other materials possessing the scheelite structure.
Phase relations in the BaSi 2 O 5 −BaAl 2 Si 2 O 8 −SiO 2 portion of the system BaO‐Al 2 O 3 −SiO 2 were reinvestigated by the standard quenching method. In contrast to the results of earlier studies, this portion is revealed as a simple ternary system; its features include a ternary eutectic at 1122°±7°C and a compos…
Vacancy damage produced by heavy ion, and neutron irradiation, of tungsten, at ambient temperatures, has been examined by both field ion and electron microscopy. Field ion microscopy revealed defects in the form of single vacancies, irregularly shaped voids (compact clusters) containing up to 300 vacancies, ‘dispersed…
The dielectric relaxation of amorphous bulk poly(2, 6-dimethyl phenylene oxide) (PPO) has been measured between −160° and 260°C over a frequency range extending from 0.1 to 10 kHz. Two broad loss peaks of comparable intensities are observed-a high-temperature α relaxation identified with the glass transition and a low…
A theory of dielectric relaxation is presented which is based on using an interpolation function to represent a classical correlation function which is analytic at the origin and becomes exponential at sufficiently long times. The Fourier transform of this interpolation function is a relatively simple analytical funct…
SUMMARY Relationships between crystal chemistry and genetic conditions are presented for a series of dioctahedral micaceous minerals. Using a ferruginicity index, three groups of micaceous minerals are distinguished: Al‐micas, Fe‐illites, and glauconites. The degree of Al‐for‐Si substitution in the tetrahedral sheets…
Ceramic platelets and oriented single crystals of PbTiO3 have been investigated by Raman and infrared spectroscopy. The symmetries of the zone-center optical phonons are described and their temperature dependences from 20–760°K are studied, demonstrating that the doubly degenerate modes are relatively the “softest.” I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSuperexchange interaction in anhydrous copper(II) formateMotomichi Inoue and Masaji KuboCite this: Inorg. Chem. 1970, 9, 10, 2310–2314Publication Date (Print):October 1, 1970Publication History Published online1 May 2002Published inissue 1 October 1970https://pubs.acs.org/do…
Abstract Diffusion coefficients of H in Pd and Pd/Ag-alloys were determined at low hydrogen concentration and at temperatures between 0 and 60 °C by a new electrochemical pulse method making use of time-lag-techniques. The preexponential factor D 0 decreases slightly with rising silver content (x=weight % Ag/100) : lo…
Abstract The transformation of microspherulitic quenched and annealed polyethylene film into highly oriented drawn material with the characteristic fiber structure was investigated by small‐angle and wide‐angle x‐ray measurements and by a study of the thermograms after the fuming nitric acid treatment. With the detail…
Abstract Glycopeptides from carp swim bladder, guinea pig skin, and human skin collagens were prepared by sequential collagenase-trypsin digestion. Gel filtration on Sephadex G-25 permitted the isolation of a low molecular weight fraction containing most of the hydroxylysyl glycosides present in the parent collagen. A…
Abstract The curing reaction of polyester fumarate with styrene was investigated with a differential scanning calorimeter (DSC) operated isothermally. The change in rate of cure was followed over the whole range of conversion. The rate of cure is accelerated by the gel effect to about ten to fifty times the rate of mo…
Annealing treatments at elevated temperatures have been characterized by a specific infrared absorption assigned to the regularly folded chain segments in poly(ethylene terephthalate). The higher the annealing temperature, the more regular is the chain folding introduced into the fiber. When a fiber is free to contrac…
The 51V NMR of the diamagnetic V5+ and paramagnetic V4+ ions has been studied in the semiconducting V2O5–P2O5 glass system. From computer-simulation studies of the 51V NMR experimental spectra due to the V5+ sites, it has been determined that the spectra obtained at the higher spectrometer frequencies can be described…
Polytetrafluoroethylene (PTFE) has been γ-irradiated in the presence of gaseous radical scavengers. Irradiations in a vacuum resulted in small yields of low-molecular-weight fluorocarbons. The presence of methane during irradiation led to G(CH3F) = 0.06. Although hydrogen is a major product from the radiolysis of ethy…
A rise in specimen temperature due to electron irradiation was directly measured by using a microthermocouple composed of evaporated gold and palladium films. The temperature rise with an increase in electron current density was explained referring to the thermal conduction and thermal radiation effects. The experimen…