Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface interaction in solvent-cast polystyrene-poly(methyl methacrylate) diblock copolymersPeter F. Green, Thomas M. Christensen, Thomas P. Russell, and Robert JeromeCite this: Macromolecules 1989, 22, 5, 2189–2194Publication Date (Print):May 1, 1989Publication History Publ…
The ultraviolet absorption spectra for polyimide and several polyimide model compounds have been measured and the spectroscopically parametrized CNDO/S3 model is used to provide a detailed quantitative description of the spectra. Analysis of the optical absorption spectrum yields a value of 30° for the phenylimide tor…
We apply the theory of ferroelectricity in the framework of the polarizability model, which has been presented in a previous paper, to various classes of displacive-type ferroelectrics. We show that the experimental data of temperature-dependent quantities like soft-mode frequencies and dielectric constants can be wel…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase diagrams for binary polymer systems exhibiting both crystallization and limited liquid-liquid miscibilityW. R. BurghardtCite this: Macromolecules 1989, 22, 5, 2482–2486Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1…
The activity of the amino sugar-synthesizing enzyme L-glutamine:D-fructose-6-phosphate aminotransferase (EC 2.6.1.16) in haploid a cells of Saccharomyces cerevisiae increases 1.7-fold after alpha factor addition. The gene (the gene should be called GFA1 for glutamine:fructose-6-phosphate amidotransferase) for the enzy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical spectroscopy of copper(I)-doped sodium-.beta."-aluminaJ. D. Barrie, B. Dunn, Gary Hollingsworth, and Jeffrey I. ZinkCite this: J. Phys. Chem. 1989, 93, 10, 3958–3963Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1…
Abstract Novel electron acceptors bearing a heteroquinonoid system, 5,5′-bis(dicyanomethylene)-5,5′-dihydro-Δ2,2′-bithiophene, its 3,3′-dichloro, 3,3′-dibromo, and 3,3′,4,4′-tetrabromo derivatives, and 5,5″-bis(dicyanomethylene)5,5″-dihydro-Δ2,2′:5′,2″-terthiophene were synthesized by the action of tetracyanoethylene…
In the framework of the Ginzburg-Landau theory, we derive and discuss the relation RH\ensuremath{\cdot}B=4\ensuremath{\pi}(@${F}_{\mathrm{kin}}$+${2F}_{\mathrm{field}}$-(${12F}_{\mathrm{inhom}}$), which should be useful in numerical calculations of magnetic properties of type-II superconductors.
Abstract Mechanical and rheological properties of blends of a thermotropic liquid crystalline polyester with a polycarbonate have been investigated. The blends are fibrillar in character and exhibit great hardness and toughness due to high degree of molecular orientation which develops during the melt blending and pro…
TEM was used to observe nanoscale microstructural changes which occur over a range of PMN-PT compositions. Increasing PT additions to the PMN-PT solid solution modify ferroelectric and structurally ordered domains. The relevance of nanostructural changes to the corresponding dielectric properties are briefly discussed.
A detailed examination is presented of the causes, removal, and use of differential charging in x-ray photoelectron spectroscopy [electron spectroscopy for chemical analysis (ESCA)] and related spectroscopies. Particular attention is devoted to the impact of this phenomenon during the dispersion (or conversely crystal…
Resonance Raman (RR) spectra have been analyzed for porphyrin radical cations prepared electrochemically from the Ni<sup>2+</sup>, Cu<sup>2+</sup>, VO<sup>2+</sup>, and (Cl<sup>-</sup>)Fe<sup>3+</sup>complexes of octaethylporphyrin (OEP) and meso-tetraphenylporphyrin (TPP). Band assignments have been secured via polar…
In this paper we report on the existence, distribution, crystallographic orientation, size, and morphology of graphite crystallites within diamond films prepared by microwave plasma assisted chemical vapor deposition. Transmission electron microscopy and Raman spectroscopy techniques were used to characterize graphite…
Crystallized as-grown Bi(Pb)-Sr-Ca-Cu-O thin films are formed by the laser ablation method at a substrate temperature as low as 480 °C under N2O gas flow. Moreover, the as-grown thin film, which has a crystal structure consisting of four or five CuO2 layers between adjacent Bi2O2 layers, can be formed by the combinati…
Phase transitions of L - and D -enantiomers of 4-(1-methylheptyloxycalbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate (MHPOBC) were studied by the DSC method. Two new phases have been observed between the smectic A phase and the smectic C * phase and between the smectic C * phase and the third stable state ( S Y * phas…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation P. A. Steinmann, H. E. Hintermann; A review of the mechanical tests for assessment of thin‐film a…
The magnetic properties of single crystals of the chain compound formed by manganese(I1) hexafluoroacetylacetonate and the nitronyl nitroxide radical NIT-i-Pr (NIT-i-Pr = 2-isopropyl-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazolyl-l-o3x-yolx ide), Mn(hfa~)~NIT-i-Phra,v e been investigated at low temperature to character…
Abstract The effect of deformation history on the morphology and properties of liquid crystalline polymers (LCP) blended with polycarbonate resin was assessed. The addition of an immiscible LCP phase was found to improve the melt processability of the host thermoplastic polymer. In addition, by employing a suitable de…
The preparation and mesomorphic properties of a series of bis-(4-alkyl- or 4-alkoxy-benzoyloxy)-trans-1,4-dioxanes 1, trans-1,4-dithianes 2 and trans-1,4-cyclohexanes 3 are reported and compared to the corresponding hydroquinone bis-esters 4. The 1,4-dithianes 2 do not show liquid crystalline properties and the 1,4-di…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and liquid-crystalline properties of (acetyl)(ethyl)celluloseJian Xin Guo and Derek G. GrayCite this: Macromolecules 1989, 22, 5, 2082–2086Publication Date (Print):May 1, 1989Publication History Published online1 May 2002Published inissue 1 May 1989https://pubs.a…