Materials Literature
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The frequency dependence of the specific heat of glycerol at the glass transition has been measured. A time-temperature equivalence is found - the mean relaxation time having an activation temperature of 2.1.104 K. In the high frequency limit C - C∞ decays as a power law with exponent 0.28
The study of the recently introduced model of a particle in a periodic potential interacting with an external environment has been pursued, and two main new results are reported: (i) The Hamiltonian is exactly soluble for a particular value of the friction coefficient, \ensuremath{\eta}=\ensuremath{\Elzxh}\ensuremath{…
Using a transfer matrix technique and finite size scaling, the authors calculate the exponent nu t of two-dimensional polymers at the theta point. They find nu t =0.55+or-0.01 by two slightly different calculations on the square lattice. This value is compared with those which had been previously proposed in the liter…
Simultaneous electrochemical and ellipsometric studies of the anodic film growth on iron in have revealed that passivation occurs in two stages. During the first stage, which lasts for about 2s, the anodic current is consumed only for film growth, whereas in the second stage release of iron cations into the electrolyt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral complexes polymerize methacrylate esters to give helical polymers that mutarotate by uncoilingDonald J. Cram and Dotsevi Y. SogahCite this: J. Am. Chem. Soc. 1985, 107, 26, 8301–8302Publication Date (Print):December 1, 1985Publication History Published online1 May 200…
Abstract The tensile behavior of polypropylene (PP) filled with calcium carbonate particles has been studied using a tensile test. In particular, the effect of strain rate, filler content, and filler size upon the elastic modulus, yield stress, and strain of surface‐modified and unmodified particles‐filled PP were inv…
Polypyrrole obtained by chemical oxidation of pyrrole in ethanol–water solution containing FeCl3 can be reduced chemically in Na+Naph−/THF solution and then reoxidized with FeCl3, SnCl4, and SbCl5. 57Fe and 119Sn Mössbauer spectra of the reaction products show only one type of iron and tin with Mössbauer parameters ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCesium-promoted silver(111): model studies of selective ethylene oxidation catalystsCharles T. CampbellCite this: J. Phys. Chem. 1985, 89, 26, 5789–5795Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985htt…
Abstract The morphology and mechanical properties of binary blends of nylon 6 (N6), as the major component, and ethylene‐methacrylic acid copolymers (E/MAA), as the minor component, have been analyzed. It was found that the methacrylic acid content of the copolymer used as the second component has a profound effect up…
Closely spaced, 0.2-1 micrometer, Au microelectrodes on Si3N4 can be functionalized with polyvinylferrocene, PVFc(+)/(o), or with an N, N'- dibenzyl-4,4'-bipyridinium-based polymer, (BPQ(2+)/(+)n, derived from hydrolysis of N, N'-bis((P-trimethoxysilyl) benzyl)-4-4'bipyridinium, I. Two- or eight-microelectrodes arrays…
Absorption spectra and light-induced absorbance changes of crystals from Rhodopseudomonas viridis reaction centers are recorded. A theoretical analysis of the absorption and circular dichroism spectra is presented, yielding a consistent picture of spectroscopic and structural information.
The latest in a series on crystallographic computing, this collection of 33 papers covers the full spectrum of computer applications in crystallography, including the use of micro-, mini-, and mainframe computers. Special emphasis is given to single crystal and powder data collection, including position sensitive dete…
Abstract The lattice thermal conductivity of ZnS :Fe 2+ and CdTe: Fe 2+ is analysed on the basis of Callaway's formalism with an emphasis on resonant scattering of phonons from the magnetic levels of the Fe 2+ ions. The resonant scattering of E‐mode phonons corresponding to the T 1 → T 3 transition and T 2 ‐mode phono…
Abstract A 50 mm twin screw extruder was used to study the melting profiles of various PVC formulations. Melt temperature and degree of flux are measured axially along various mixing paddle arrangements. The viscous work is correlated with the rheology of the PVC mass and effective shear rate of the intermeshing co‐ro…
Powder metallurgy dispersions of uranium silicides in an aluminum matrix have been developed by the international Reduced Enrichment for Research and Test Reactors program as a new generation of proliferation-resistant fuels. A major issue of concern is the compatibility of the fuel with the matrix material and the di…
As a consequence of their structure, modal formulations for diffraction gratings may satisfy reciprocity and conservation of energy criteria exactly, independently of the errors incurred when using truncated field expansions. We consider completeness relations, which provide a means of assessing truncation errors in m…
The dynamic and equilibrium swelling behavior of polystyrene microparticles crosslinked with divinyl benzene was investigated in methyl ethyl ketone and cyclohexane. The dynamic studies gave new information about the mechanism of penetrant transport in this polymer. The equilibrium studies were used to determine impor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization of 2-(trimethylsilyl)pyrrolesThomas J. Barton and Gregory P. HussmannCite this: J. Org. Chem. 1985, 50, 26, 5881–5882Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985https://pubs.acs.or…
Abstract The inclusion of Re in Pt‐Re‐Al 2 O 3 reforming catalysts to improve the lifetime is known, but how rhenium functions and how it is disposed in the catalyst remain unclear. These fundamental questions have been attempted in this study by the use of proton‐induced X‐ray emission and Rutherford backscattering s…
The visual and electrical effects of arced SF6 gas on epoxy spacers with various fillers are examined. Field experience and laboratory investigations into the dielectric degradation of epoxy spacers and maintenance techniques for identifying serious loss of dielectric withstand are discussed. Rehabilitation of damaged…