Materials Literature
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Abstract Thin films of poly( p ‐phenylene biphenyltetracarboximide) (BPDA‐PDA), prepared by thermal imidization of the precursor poly(amic acid) on substrates, have been investigated by optical waveguide, ultraviolet‐visible (UV‐VIS), infrared (IR), and dielectric spectroscopies. The polyimide films exhibit an extraor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility of bacterial poly(3-hydroxybutyrate) with cellulose estersMariastella Scandola, Giuseppina Ceccorulli, and Maria PizzoliCite this: Macromolecules 1992, 25, 24, 6441–6446Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeposition of metal overlayers at end-group-functionalized thiolate monolayers adsorbed at gold. 1. Surface and interfacial chemical characterization of deposited copper overlayers at carboxylic acid-terminated structuresEarl L. Smith, Carla A. Alves, James W. Anderegg, Marc…
Achiral polysiloxanes with para-alkoxybenzoic acid side chains can bind many molecules of an optically active trans-stilbazole with hydrogen bonds. The resulting, self-assembling system 1 has ferroelectric properties which can be regulated by the number of stilbazole units per polymer molecule and the length of the (C…
The many-body potential of Ackland et al. is currently being used to investigate the production of displacement damage cascades in irradiated copper, using the molecular dynamics computer program MOLDY. The effect of adopting this potential on both the static and the dynamic properties of irradiation-induced defects i…
An experimental protocol is described for simultaneous measurements of liquid wetting and retention characteristics in woven fabrics. Dynamic measurements of the liquid-fabric interaction between the lower edge of a vertically hung fabric and a liquid are done with an electronic microbalance. A decoupling method is pr…
A synthetic procedure leading to derivatives of tetrathiafulvalene (TTF) incorporating crown ether ligands has been developed. The properties of such redox-active ionophores were studied by cyclic voltammetry (CV), plasma desorption mass spectrometry (PDMS), and <sup>1</sup>H-NMR.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHomopolymer distributions in ordered block copolymersA. M. Mayes, T. P. Russell, S. K. Satija, and C. F. MajkrzakCite this: Macromolecules 1992, 25, 24, 6523–6531Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 Novemb…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of PEEK sulfonation in concentrated sulfuric acidNobuhiro Shibuya and Roger S. PorterCite this: Macromolecules 1992, 25, 24, 6495–6499Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTValence band spectra of aluminum oxides, hydroxides, and oxyhydroxides interpreted by X.alpha. calculationsSajan. Thomas and Peter M. A. SherwoodCite this: Anal. Chem. 1992, 64, 21, 2488–2495Publication Date (Print):November 1, 1992Publication History Published online1 May 2…
c-axis-oriented ZnO films were prepared in O2 atmosphere by chemical vapor deposition using zinc acetylacetonate for source material. A minimum value of resistivity, 2.44 Ω cm, was obtained at a film formation temperature of 550 °C. The resistivity of the films was measured at low temperatures (87–297 K). For temperat…
An objective methodology is developed for evaluating toughness curves ( T ‐curves) of ceramics using indentation flaws. Two experimental routes are considered: (i) conventional measurement of inert strength as a function of indentation load; (ii) in situ measurement of crack size as a function of applied stress. Centr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of titania aerogelsL. K. Campbell, B. K. Na, and E. I. KoCite this: Chem. Mater. 1992, 4, 6, 1329–1333Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs.acs.org/d…
The mechanism of the dc electrical conduction and breakdown of perovskite-type titanates was investigated by impedance analysis. Based on an acceptor doped SrTiO3 model material, samples of different microstructures-ceramics, single crystals, and thin films-were employed. This approach allows us to distinguish conduct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of donor-acceptor substituted stilbenes. A time-resolved fluorescence study using selectively bridged dimethylamino cyano model compoundsRene Lapouyade, Konstantin Czeschka, Wilfried Majenz, Wolfgang Rettig, Eric Gilabert, and Claude RulliereCite this: J. Phys.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic interactions in model polyolefin blends obtained by small-angle neutron scatteringN. P. Balsara, L. J. Fetters, N. Hadjichristidis, D. J. Lohse, C. C. Han, W. W. Graessley, and R. KrishnamoortiCite this: Macromolecules 1992, 25, 23, 6137–6147Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and catalytic activity of alumina supported platinum-cobalt bimetallic catalysts. 3. Effect of treatment on the interface layerZoltan Zsoldos and Laszlo GucziCite this: J. Phys. Chem. 1992, 96, 23, 9393–9400Publication Date (Print):November 1, 1992Publication Histo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature chemistry of the conversion of siloxanes to silicon carbideGary T. Burns, Richard B. Taylor, Youren Xu, Avigdor Zangvil, and Gregg A. ZankCite this: Chem. Mater. 1992, 4, 6, 1313–1323Publication Date (Print):November 1, 1992Publication History Published onli…
The thermal conductivity of a 40 vol% silicon carbide‐particulate‐reinforced aluminum matrix composite was determined as a function of silicon carbide mean particle size ranging from 0.7 to 28 μm. A size dependence was found consisting of a decrease in thermal conductivity with decreasing SiC particle size. This effec…
To explain the observed deviation from the Rapini-Papoular surface energy of nematic-liquid-crystals, we propose a model of the form Tr[(${\mathit{Q}}_{\mathit{i}\mathit{j}}$-${\mathit{Q}}_{0\mathit{i}\mathit{j}}$${)}^{2}$] (${\mathit{Q}}_{\mathit{i}\mathit{j}}$ is the quadrupolar order parameter of the nematic-liquid…