Materials Literature
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Recent void shrinkage models are reviewed and refined. The role of surface selfdiffusion is discussed for modelling void shrinkage by selfdiffusion along the void surface and bond interface. The refinement of the existing models makes it possible to discuss the effect of void crushing by power law creep, the validity…
A glutamic acid-specific protease has been purified to homogeneity from Bacillus licheniformis ATCC 14580 utilizing Phe-Leu-D-Glu-OMe-Sepharose affinity chromatography and crystallized. The molecular weight of the protease was estimated to be approximately 25,000 by SDS-polyacrylamide gel electrophoresis. This proteas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal synthesis and structural characterization of four layered vanadyl(IV) phosphate hydrates A(VO)2(PO4)2.cntdot.4H2O (A = Co, Ca, Sr, Pb)H. Y. Kang, W. C. Lee, S. L. Wang, and K. H. LiiCite this: Inorg. Chem. 1992, 31, 23, 4743–4748Publication Date (Print):November…
Strains of two types of methylotrophic bacteria, Paracoccus denitrificans and Methylobacterium extorquens, synthesized the copolyester poly(3-hydroxybutyrate-co-3-hydroxyvalerate) when methanol and n-amyl alcohol were added together to nitrogen-limited medium. The composition of the copolyester differed considerably b…
In order to investigate thermodynamic properties and microscopic structure around the crystal-smectic transition, we present constant-pressure molecular-dynamics simulations for soft parallel spherocylinders as a model for liquid crystals. The method of Andersen [J. Chem. Phys. 72, 2384 (1980)] as well as the method o…
Generally applicable techniques for surface analysis are described for prepared coating surfaces, with the recommendation that they be utilized prior to any fouling‐release field trials. The effectiveness of these techniques to predict nontoxic fouling‐release is supported by citation of results from the performance o…
Following the recent resolution of the longstanding problem of reconciling constant frequency nuclear-spin lattice relaxation (SLR) activation energies and d.c. conductivity activity energies in ion conducting glasses, we point out a new problem which seems not to have been discussed previously. We report conductivity…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and processing of heterocyclic polymers as electronic, optoelectronic, and nonlinear optical materials. 1. New conjugated rigid-rod benzobisthiazole polymersJohn A. Osaheni and Samson A. JenekheCite this: Chem. Mater. 1992, 4, 6, 1282–1290Publication Date (Print):N…
FT-Raman spectra of some polyiodides and of a series of D · I 2 charge-transfer complexes (where D is a molecule containing the thione or selone groups as donors), all characterized by x-ray diffraction, are reported. For the adducts with the thione compounds, which can be considered weak or medium-weak complexes, an…
We present a very strong evidence for a first-order melting transition in the hard-disk system by exploiting the finite-size scaling of the bulk free-energy barrier. We use isobaric Monte Carlo simulations to allow fluctuations in the volume of the system, which lead, in the presence of a first-order transition, to a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow molar mass liquid-crystalline glasses: preparation and properties of the .alpha.-(4-cyanobiphenyl-4'-oxy)-.omega.-(1-pyreniminebenzylidene-4'-oxy)alkanesG. S. Attard, C. T. Imrie, and F. E. KaraszCite this: Chem. Mater. 1992, 4, 6, 1246–1253Publication Date (Print):Novem…
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…