Materials Literature
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Abstract Polycarbonate tensile bars were aged up to 18 months at 0%, 75%, and 100% relative humidity and temperatures of 65–93°C. In the humid aged samples hydrolysis caused progressive reductions in molecular weight. Below a critical molecular weight ( M w = 33,800, M n = 14,300) tensile strength dropped off rapidly.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentagonal-bipyramidal complexes. Synthesis and characterization of aqua(nitrato)[2,6-diacetylpyridine bis(benzoyl hydrazone)]cobalt(II) nitrate and diaqua[2,6-diacetylpyridine bis(benzoyl hydrazone)]nickel(II) nitrate dihydrateThomas J. Giordano, Gus J. Palenik, Ruth C. Pal…
Abstract— The triplet absorption spectra, lifetimes, extinction coefficients, e TT , and intersystem crossing quantum yields to the lowest triplet T 1 , ø T1 , of thymidine, thymidine monophosphate, uridine and uridine monophosphate, have been determined in various solvents at 300 K. The effect of H‐bonding on ø T1 ,…
Studies of the electrical transport properties---resistivity, Hall effect, and Seebeck coefficient---of the hexagonal tungsten bronze ${\mathrm{Rb}}_{x}\mathrm{W}{\mathrm{O}}_{3}$ for $0.16<~x<~0.33$ are reported for the temperature range from 1.5 to 300 K. In the normal state, these properties show temperature-…
The boson theory is reformulated in a form applicable to the mixed state in the rare-earth compounds, $R{\mathrm{Rh}}_{4}{\mathrm{B}}_{4}$, ${R}_{x}{\mathrm{Mo}}_{6}{\mathrm{S}}_{8}$, and ${R}_{x}{\mathrm{Mo}}_{6}{\mathrm{Se}}_{6}$. The magnetic field induced by the persistent current of vortices, and the spin magneti…
The crystal structures of the title compounds [${\mathrm{C}}_{4}$${\mathrm{H}}_{8}$SO (TMSO), ${\mathrm{C}}_{2}$${\mathrm{H}}_{6}$SO (DMSO)] have been determined. The TMSO salt is orthorhombic [space group $\mathrm{Pbca}$, $a=13.844(10)$, $b=6.418(12)$, and $c=17.480(16)$ \AA{}] while the DMSO salt is monoclinic [spac…
Polyhedral tilt transformations are a subgroup of pure displacive solid-solid phase transitions that occur in many ionic compounds and have all the following characteristics: (1) the transitions occur in compounds with structures composed of corner-linked, rigid polyhedral elements; (2) transitions are between a highe…
Integrated X-ray intensities of Bragg peaks were observed from single crystals of Zr0.866Ca0.134Ol.866 and Zr0.786Y0.214O1.893 in the disordered state. There are displacements of oxygen ions (characterized by Δ/a ~ 0.05) from the ideal positions of the fluorite structure along (100) directions similar to those that oc…
Abstract Behavior of poly(ethylene oxalate) in a temperature range of 148–240°C was studied, and a new method of isolating 1,4‐dioxane‐2,3‐dione from the products of decomposition of poly(ethylene oxalate) was used. The process of decomposition was second order. Equilibrium of poly(ethylene oxalate) and 1,4‐dioxane‐2,…
Abstract Protective clothing against head and flames should be evaluated not only for flame retardance but also for protection against various heat exposure from convection (flames), conduction (molten metal splashes) and radiation sources, depending on the end use, to ensure a realistic assessment of the potential pr…
The concentration of vanadium in the blood and urine of both nonexposed and occupationally exposed workers have been determined by neutron activation analysis. A comparison of the exposure data and the corresponding blood and urine values shows that the urine vanadium concentration adjusted for creatinine concentratio…
Stopping powers derivable from Lindhard’s dielectric theory of stopping for a charged particle in a uniform electron gas are calculated as a continuous function of electron density for a wide variety of projectile energies ranging from 102 to 104 keV/amu. Results are presented for electron densities varying from 1022…
Abstract A chemical group contribution technique, based on the principle of additivity of molar attraction constants for groups in a molecule, has been used for determining the solubility parameters for several polyesters, polyethers and a few other types of polymers. The solubility parameter for a polymer is calculat…
The radio influence voltage (RIV), discharge, and visual detection of gas bubbles from models simulating present standard loading practice appear to be the first tangible basis for reducing the maximum allowable hot-spot temperature in power transformer loading guides.
Hydrogen permeability of high‐density, high‐purity sintered alumina tubes was measures is a function of temperature and pressure using tritium as a tracer. The permeability, ø, at 1200° to 1450°C and hydrogen partial pressure between 2 and 50 kPa is: φ(H atoms cm cm −2 s −1 kPa −0.43 ) = exp(48.95±0.61) exp[−318.2±18.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron Diffraction Investigation of a High-Temperature Form of Poly(vinylidene fluoride)Andrew J. Lovinger and H. D. KeithCite this: Macromolecules 1979, 12, 5, 919–924Publication Date (Print):September 1, 1979Publication History Published online1 May 2002Published inissue…
This paper describes the results of investigation made into the performance of insulators covered with snow or ice. The AC and DC withstand voltages of snow-covered insulators were characterized by the conductivity of water melted from the snow. The AC withstand voltage of ice-coated insulators was characterized by th…
Summary To sub‐divide the large group of kaolinitic soil clays a new empirical index of crystallinity was obtained from the X‐ray diffraction patterns of eight standard kaolins. The index used is the ratio of the intensity above background of the peak at 4.46Å to the intensity above background at about 2.43Å (43.2° 2θ…
ABSTRACT A specially designed small‐scale foaming apparatus was used to determine dynamic and static foaming properties of proteins. Foam was produced by sparging nitrogen at a known rate through a dilute protein solution. The temperature of the protein solution and protein foam was maintained by a water‐jacketed colu…
Plasticizer/polymer interactions have been studied by measuring the intrinsic viscosities of both ethyl cellulose and hydroxypropyl methylcellulose in a series of dialkyl phthalates and in a series of liquid glycols respectively. A correlation was found between the intrinsic viscosity of the polymer/plasticizer soluti…