Materials Literature
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Abstract The thermal and electron impact induced degradation reactions of poly(ε‐caprolactone) {poly[oxy(1‐oxohexamethylene)]} were investigated in a mass spectrometer. It can be shown that the favorated thermal degradation reaction is the cleavage of the ester bond and formation of ω‐hydroxyl and ketene endgroups (Eq…
The data extracted from numerous irradiation tests were used to derive amoeba endurance parameters for UO2.The data do not yet allow an unambiguous definition of the controlling mechanism, which may be due to either gaseous or solid-state diffusion processes. Adequate data on the amoeba effect are available for design…
Abstract A differential scanning calorimeter (DSC) was used to study the melting behavior of drawn nylon 6 yarns which were prevented from shrinking during heating. The DSC curves exhibit a single melting peak at a higher temperature instead of the double peaks which, as reported previously, were observed in the uncon…
Abstract The glass transition, crystallization, and α–β transition of the Tussah silk fibroin were studied by means of DSC (differential scanning calorimetry) and infrared spectroscopy. The endothermic shift due to the glass transition was observed at 162°C. The endothermic peak at 220°C was attributed to the α–β conf…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of the skutterudite-related phases CoGe1.5S1.5 and CoGe1.5Se1.5R. Korenstein, S. Soled, A. Wold, and G. CollinCite this: Inorg. Chem. 1977, 16, 9, 2344–2346Publication Date (Print):September 1, 1977Publication History Published online1 May 20…
The crystal structure of a bismuth titanate, Bi7Ti4NbO21, was determined on the basis of super-high- resolution images, taken by a recently constructed 1000 kV electron microscope, in which each cation site was approximately defined. It was found that the crystal has a mixed-layer structure, i.e. Bi4Ti3O12 and Bi3TiNb…
Collagen fibrils provide a biological example of smectic A liquid crystals. They demonstrate spiralling of their constituent chiral molecules, about the normal to their layers, when they undergo a transition to smectic C. Under tension, perpendicular to the planes of the layers, their molecules are tilted and some of…
A dynamic central peak of width \ensuremath{\sim}50 MHz has been observed in the depolarized-light-scattering spectrum of K${\mathrm{H}}_{2}$P${\mathrm{O}}_{4}$. It is seen only in the ferroelectric phase within \ensuremath{\sim}0.1\ifmmode^\circ\else\textdegree\fi{}K of the transition, where its intensity exceeds tha…
Experiment and theory have shown that the orientational free energy of nematic liquid crystals contains both a translational entropy term and an orientational energy term, which are of the same order of magnitude. It has been proposed recently that the energy term is due to the total attractive interaction energy, whi…
The current density distribution in a conductor of finite size is affected by the presence of eddy currents in the conductor. This phenomenon, generally known as skin effect, causes ohmic losses in the conductors and alters their magnetic induction. This paper presents an analysis of skin effect phenomena using the tr…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePolymer Chain Stiffness Parameter, σ, and Cross-Sectional Area per ChainRaymond F. Boyer and Robert L. MillerCite this: Macromolecules 1977, 10, 5, 1167–1169Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Published inissue 1 September 1977…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and relation between magnetic and structural properties of a series of monomeric and dimeric nickel(II) complexes. Crystal and molecular structures of [Ni(biq)Cl2]2, Ni(biq)Br2, [Ni(dmp)Cl2]2, [Ni(dmp)Br2]2 and Ni(bc)I2Ray J. Butcher and Ekk. SinnCite this: Inorg.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational analysis of protected norvaline oligopeptides by high resolution proton magnetic resonanceE. S. Pysh and C. TonioloCite this: J. Am. Chem. Soc. 1977, 99, 19, 6211–6219Publication Date (Print):September 1, 1977Publication History Published online1 May 2002Publi…
Abstract The morphology of a chemically crosslinked urethane elastomer is correlated with its time‐dependent mechanical properties. Evaluation of this amorphous elastomer by electron microscopy and small‐angle x‐ray scattering reveals that incompatible chain segments cluster into separate microphases having a periodic…
Abstract The techniques of Auger electron spectroscopy (AES) and x‐ray photoelectron spectroscopy (XPS) have been used to study the locus of failure of epoxy resin joints. The effects of a long water immersion and the application of a silane‐based primer have also been studied. Results indicated that for dry joints fr…
Homothallic strains of Saccharomyes cerevisiae are able to switch efficiently from one mating genotype to another. From a single haploid spore arise both a and mating type cells, which then self-mate to produce a colony consisting almost exclusively of nonmating a/ diploid cells. We have isolated a mutant homothallic…
Summary Paired soils of high and low organic matter content from the East Anglian silts were used to determine the role of different organic constituents and complexed metal ions in relation to aggregate stability. Although leaching with periodate and borate caused some loss of stability for most of the soils, the cha…
Azotobacter beijerinckii synthesized up to 70% of its dry weight as poly-β-hydroxybutyrate when grown in batch or oxygen-limited chemostat cultures on a glucose/ammonium salts medium. In a series of steady states during transition from oxygen to ammonium limitation and at different dilution rates in the chemostat, the…
The miscibility gap of the α phase in Fe-Cr-Co permanent magnet alloys is constructed using mechanical hardness and Curie temperature measurements. It is found that the miscibility gap of the Fe-Cr binary system develops into Fe-Cr-Co ternary system, and that the addition of cobalt raises the decomposition temperature…
Ultrasonic data for the velocities of the low- and high-pressure polymorphs of stannate and titanate compounds undergoing the spinel → rocksalt + rutile (Mg2SnO4, Co2SnO4) and spinel → rocksalt + ilmenite (Mg2TiO4, Co2TiO4) phase transformations have been determined as a function of pressure to 7.5 kbar at room temper…