Materials Literature
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Abstract High molecular weight polymers have become well established as packaging or container materials. Unlike metallic and ceramic barriers, however, polymer films are known for their semipermeable nature; that is, they permit small gaseous and vapor molecules to migrate through their atomic/molecular structures. S…
Abstract 1. A silane coupling agent (Si-69) reduces the viscosity and increases the scorch lime in silica- and clay-filled EPDM. The cure lime of silica-filled mixes remained unchanged and that of clay-filled mixes increased on addition of Si-69. 2. In the presence of Si-69, the silica-EPDM system exhibits higher poly…
In this lecture, the author reviews the history of thought on multiple bonds between metals and then gives detailed attention to some of the recent developments having to do specifically with multiple M-M bonds.
High‐purity lithium oxide was synthesized by thermal decomposition of the peroxide at temperatures up to 1070 K under dynamic vacuum. Analyses of typical preparations gave carbonate 0.01 to 0.02%, hydroxide 0.0 to 0.2%, sodium 0.002%, manganese 0.0004%, and lithium oxide 99.8 to 100.0%. The corrected melting point was…
The low-temperature heat capacity of antiferromagnetic ternary iron silicides ${M}_{2}{\mathrm{Fe}}_{3}{\mathrm{Si}}_{5}$ ($M=\mathrm{Sm}, \mathrm{Gd}\ensuremath{-}\mathrm{Yb}$) has been measured from 0.5 to 30 K. Antiferromagnetic ordering temperatures range from 1.06 to 10 K for these materials including multiple ma…
Superconducting ${T}_{c}$ can be increased by a low concentration, less than 1%, of irradiation-induced defects in the layered charge-density-wave (CDW) compounds $2H\ensuremath{-}\mathrm{Nb}{\mathrm{Se}}_{2}$, $2H\ensuremath{-}\mathrm{Ta}{\mathrm{S}}_{2}$, and $2H\ensuremath{-}\mathrm{Ta}{\mathrm{Se}}_{2}$. This is d…
qualitatively account for the role of these low-energy, doubly occupied MO's.Later on, we shall propose a quantitative approach of the spin polarization in coupled systems.We can already notice that, in this respect, the situation encountered with the end-on azido bridge is quite peculiar.The quasi- absence of overlap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple-state emission and intramolecular electron-transfer quenching in rhenium(I) bipyridine based chromophore-quencher complexesT. David Westmoreland, Hubert Le Bozec, Royce W. Murray, and Thomas J. MeyerCite this: J. Am. Chem. Soc. 1983, 105, 18, 5952–5954Publication Da…
Formation of HD from D2 has been demonstrated with nitrogenase preparations from Azotobacter vinelandii, Clostridium pasteurianum, Klebsiella pneumoniae, and Azospirillum sp. We conclude that the formation of HD from D2 is a general property of nitrogenases. However, the nitrogenases differ in their Ki values for D2 (…
A comprehensive analysis of elastic light scattering in cholesteric liquid-crystal systems, based upon the Mueller matrix approach, is given. Emphasis is placed upon analyzing the polarization state of the scattered light for arbitrarily polarized incident radiation. The theory is applied to the ordered cholesteric bl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of molecular weight on polymer blend phase separation kineticsRichard Gelles and Curtis W. FrankCite this: Macromolecules 1983, 16, 9, 1448–1456Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983ht…
The relationship between eddy current losses and magnetization dynamics is investigated on general bases, starting directly from Maxwell equations. The intrinsically stochastic character of the magnetization process is conveniently dealt with by describing the magnetization rate İ(r,t) as a random sequence of element…
A program incorporating the previously described double dipole model of the macrocyclic ring current in the porphyrin and chlorin ring is presented which allows the geometry of the aggregated species in solution to be obtained from observed NMR aggregation shifts. The model is capable of handling dimeric or oligomeric…
The solid solution range of melt‐grown mullite was examined by crystal‐chemical methods. The maximum Al 2 O 3 content as determined by EDX was ∼83.6 wt%, 75 mol%, or the nominal composition 3Al 2 O 3 .SiO 2 . For samples of overall composition 81 to 83 wt% Al 2 O 3 , extra lines indicating crystallographic superstruct…
Experimental studies of the blue phase of cholesteric liquid crystals have revealed two cubic phases (BPI and BPII) and a possible amorphous “fog” phase (BPIII). In addition, a number of theoretical models have been proposed which arrive at these structures from the point of view of a Landau theory, a lattice of discl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure in block polymer solutions. 5. Equilibrium and nonequilibrium aspects of microdomain formationMitsuhiro Shibayama, Takeji Hashimoto, and Hiromichi KawaiCite this: Macromolecules 1983, 16, 9, 1434–1443Publication Date (Print):September 1, 1983Publication His…
Eight strains of obligately anaerobic, mesophilic, cellulolytic bacteria were isolated from mud of freshwater environments. The isolates (C strains) were rod-shaped, gram negative, and formed terminal spherical to oval spores that swelled the sporangium. The guanine plus cytosine content of the DNA of the C strains ra…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT18[Hexa(2,6)pyridinocoronand-6]: "Sexipyridine"George R. Newkome and H. W. LeeCite this: J. Am. Chem. Soc. 1983, 105, 18, 5956–5957Publication Date (Print):September 1, 1983Publication History Published online1 May 2002Published inissue 1 September 1983https://pubs.acs.org/d…
Experimental analysis was carried out to study the rheological properties of foam. Foam was generated by simultaneously injecting air and an aqueous solution of the foaming agent through a coiled tubing foam generator. Foam was injected at the bottom of an annulus with 4.0-in. (i.d.) casing diameter and 1.5-in. (o.d.)…
We consider a one-dimensional electron gas with a half-filled band in which the electrons are coupled to both intersite and intrasite lattice distortions. In the region of parameter space in which both types of distortion develop nonzero expectation values, a new class of soliton which spontaneously breaks the charge…