Materials Literature
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Developments in polymeric materials in 1992 were characterized by small but important steps achieved as the result of much detailed work. Increasing attention is being paid to the supramolecular structure of the materials with the aim of producing ever smaller well‐defined systems. Examples cited in the review include…
By a newly developed double-stranded mutagenesis technique, histidine (H), glutamate (E), arginine (R) and leucine (L) have been substituted for the lysyl 193 residue (K-193) in isocitrate lyase from Escherichia coli. The substitutions for this residue, which is present in a highly conserved, cationic region, signific…
A complex calorimeter has been developed. This calorimeter, which can be operated both in the ac mode and the relaxation mode using the same sample cell and the same apparatus settings, uses only a small amount (30-50 mg) of sample. An application to measurements in the vicinity of the antiferroelectric phase transiti…
Abstract Gd 2 (SO 4 ) 3 · 8 H 2 O kristallisiert monoklin in der Raumgruppe C2/c mit den Gitterkonstanten a = 13,531(7), b = 6,739(2), c = 18,294(7) Å und β = 102,20(8)°. In der Struktur ist Gd von je 4 Sauerstoffatomen des Hydratwassers und der Sulfationen in Form eines stark verzerrten quadratischen Antiprismas umge…
Time‐dependent deformation behavior was investigated for soda–lime silicate glass with various water contents, using a nanoindentation technique. The complete indentation curve, loading and unloading part, is analyzed. It is shown that this deformation behavior may be represented in terms of a simple mechanical model…
Two GaAs/GaInP superlattices grown on GaAs substrates by low-pressure metalorganic chemical vapor deposition have been studied using high resolution x-ray diffraction measurements and simulations by solving Tagaki–Taupin equations. The strained layers at both interfaces of the GaAs well are identified from the simulat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the interdiffusion between poly(methyl methacrylate) films by marker movementY. Liu, G. Reiter, K. Kunz, and M. StammCite this: Macromolecules 1993, 26, 8, 2134–2136Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published…
Here we demonstrate the evolution of an unusual phase-separated pattern caused by a double quench: a first quench from a one-phase to a two-phase region and a subsequent second quench within the two-phase region. The resulting pattern evolution strongly depends upon the type of a double-quench sequence. A deeper secon…
The orthorhombic crystal structure of 2C 5 H 6 N 3 O 2 + .- Cr 2 O 7 2- (a=22.454 (6), b=15.129 (2), c=5.189 (2) A, Z=4, orthorhombic, P2 1 nb, D x =1.866 g cm -3 ] has been solved using direct methods and refined to wR=0.029 for 2514 reflections. This study provides a step towards a new route to obtain non-linear opt…
Antimicrobial sutures were prepared by the radiation grafting of 2-hydroxyethyl methacrylate (HEMA) monomer on polypropylene monofilament. It was found that the inherent characteristics of monofilaments are considerably influenced by the grafting of poly(HEMA). The grafting decreases the crystalline/amorphous ratio in…
SiO x thin films continue to be developed for polymeric flexible substrates. During the past year significant progress has been made on plasma deposition onto PET, LDPE, BOPP and BON polymer films. In addition, the first two 1.5 meter wide plasma roll coaters were completed and installed. The current state of the roll…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHexagonal-columnar mesophases in substituted phthalocyaninatopolysiloxanesThomas SauerCite this: Macromolecules 1993, 26, 8, 2057–2063Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi/10…
Cables are shielded from electromagnetic interference by wrapping them in conductive tapes such as aluminum polyester laminates, μ‐metals, or metal‐coated non‐wovens. Inherently conducting polymer (ICP) based tapes would be a lightweight option, but these are difficult to produce continuously in large quantities. This…
We introduce the phenomenological equations which describe the diffusion of one species of point defects in silicon single crystals during melt-growth. The chemical potential of point defects frozen into the crystal during CZ crystal growth is estimated, and the formation mechanism of the OSF-ring in CZ crystal is dis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRelative energies and strain energies of proposed structures for octaphosphorusBenjamin M. Gimarc and D. Scott WarrenCite this: Inorg. Chem. 1993, 32, 9, 1850–1856Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 19…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology of blends of .alpha.,.omega.-diaminopolystyrene with .alpha.,.omega.-dicarboxypoly(ethylene oxide)Katsuhiko Iwasaki, Akira Hirao, and Seiichi NakahamaCite this: Macromolecules 1993, 26, 8, 2126–2131Publication Date (Print):April 1, 1993Publication History Publishe…
Polyimide matrix composites possess an excellent balance of physical and thermal properties. However, currently available systems suffer from a number of drawbacks. Much of R & D is aimed at overcoming these drawbacks and developing new and novel polyimide materials. This review paper will examine recent developme…
Sperm whale apomyoglobin was complexed with iron porphine to examine the influence of completely removed heme side chains on the entire molecular structure.Paramagnetic NMR peak from the proximal histidine of the deoxy protein ensured formation of the iron-histidine bond.Porphine pyrrole-proton NMR signals of the cyan…
Experimental results concerning combustion of freely falling particles of copper, tungsten, steel, tantalum and molybdenum are presented in this paper. The experiments were carried out by the setup based on a method of forming and igniting monodisperse metal particles in pulsed discharge, developed at Odessa State Uni…
A free-energy model for mixtures of charged particles interacting through the Yukawa repulsive potential is derived analytically from the Onsager-type exact lower bound for the free energy of the system. It takes the form of a ``nonlinear mixing rule,'' which relates the configurational free energy of the mixture to t…