Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChiral micellar porphyrin fibers with 2-aminoglycosamide head groupsJuergen Hinrich Fuhrhop, Corinna Demoulin, Christoph Boettcher, Juergen Koening, and Ulrich SiggelCite this: J. Am. Chem. Soc. 1992, 114, 11, 4159–4165Publication Date (Print):May 1, 1992Publication History…
Abstract New aromatic polyimides containing triphenylamine unit were prepared by two different methods, i.e., a conventional two‐step method starting from 4,4′‐diaminotriphenylamine and aromatic tetracarboxylic dianhydrides and the one‐step thioanhydride method starting from the aromatic diamine and aromatic tetracarb…
Article On Ferromagnetic Ordering and Lattice Diffusion - A Simple Model / Uber ferromagnetische Ordnung und Gitterdiffusion Ein einfaches Modell was published on May 1, 1992 in the journal International Journal of Materials Research (volume 83, issue 5).
A thermochemical etching procedure, comprising a short chemical etch followed by a low‐temperature thermal anneal (typically 10 min at ≲70% of the sintering temperature), has proved successful for the preparation of alumina, aluminum nitride, and nickel zinc ferrite ceramics for micro‐structural studies. Good‐quality…
Abstract Chemical recycling of a polyurethane elastomer and a flexible foam based on methylenebis(phenyl isocyanate) (MDI) and a polyetherpolyol was performed by ammonolytic cleavage of urethane and urea bonds under supercritical conditions. Resulting products were the polyols, the amines corresponding to the isocyana…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCopper coordination chemistry of novel octadentate, tetranucleating, bis(diazine) ligands. Structural and magnetic properties of tetranuclear complexes involving a rectangular array of copper(II) centersSantokh S. Tandon, Sanat K. Mandal, Laurence K. Thompson, and Rosemary C…
The use of empirical and deterministic models for predicting damage functions for localized corrosion are reviewed and compared. In general, empirical models are successful because the distribution functions employed display great mathematical flexibility. However, they require a very significant database to achieve r…
Abstract Silica, alumina, silica‐aluminas and zeolites were screened as catalysts for polyolefins degradation. The degradations were carried out at temperatures from 200°C till to 600°C under vacuum. The degradation products were analyzed using gas chromatography‐mass spectrometry (GC‐MS). The comparison between these…
A new class of structurally complex materials whose constituent molecules are composed of three rod-like units, each attached to a central disc-like unit via a flexible spacer have been synthesized and their phase behaviour investigated. They are found to exhibit a rich and unusual liquid-crystalline polymorphism.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies of the alternating copolymerization of vinyl ethers with chlorotrifluoroethyleneB. Boutevin, F. Cersosimo, and B. YoussefCite this: Macromolecules 1992, 25, 11, 2842–2846Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published iniss…
Microstructure, phase stability, and mechanical properties of CeO 2 ‐partially‐stabilized zirconia (12 mol% Ce‐TZP) containing 10 wt% Al 2 O 3 and 1.5 wt% MnO were studied in relation to the base Ce‐TZP and the Ce‐TZP/Al 2 O 3 composite without MnO. The MnO reacted with both CeO 2 and Al 2 O 3 to form a new phase of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvaluation of segmental interaction by small-angle x-ray scattering based on the random-phase approximation for asymmetric, polydisperse triblock copolymersShinichi Sakurai, Keiji Mori, Atsuo Okawara, Kohtaro Kimishima, and Takeji HashimotoCite this: Macromolecules 1992, 25,…
Two test specimens of skin were cut from the lateral aspect of each hind limb of 9 rats. Specimens were contiguous, thereby providing matched pairs. One specimen was immediately placed in liquid nitrogen for 5 minutes, then stored at -70 C and tested within 3 to 4 weeks. Within 5 minutes of harvest, the second specime…
Summary Two test specimens of skin were cut from the lateral aspect of each hind limb of 9 rats. Specimens were contiguous, thereby providing matched pairs. One specimen was immediately placed in liquid nitrogen for 5 minutes, then stored at −70 C and tested within 3 to 4 weeks. Within 5 minutes of harvest, the second…
Electrochemical impedance spectroscopy (EIS) was applied over a wide frequency range to characterize the corrosion protection behavior by two types of zinc-rich paints (ZRP) (zinc-rich epoxy polyamide and zinc-rich ethyl silicate) on steels. Information concerning the properties of ZRP coatings has been evaluated from…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonlinear optical properties of poly(p-phenylenebenzobisoxazole)Samson A. Jenekhe, John A. Osaheni, Jeffrey S. Meth, and Herman VanherzeeleCite this: Chem. Mater. 1992, 4, 3, 683–687Publication Date (Print):May 1, 1992Publication History Published online1 May 2002Published i…
Thermus thermophilus ribonuclease H was overexpressed and purified from Escherichia coli. The determination of the complete amino acid sequence allowed modification of that predicted from the DNA sequence, and the enzyme was shown to be composed of 166 amino acid residues with a molecular weight of 18,279. The isoelec…
The major issues dealt with in this article are the possibility and principles of measuring multiple fabric properties with a single testing process, the fabric extraction method, which has been applied to handle measurement and evaluation. A theoretical model proposed by Alley is presented with some modifications to…
Adsorption of globular proteins at an air-water interface from an infinite stagnant medium was modeled as one-dimensional diffusion in a potential field. The interaction potential experienced by an adsorbing molecule consisted of contributions from electrostatic interactions, work done against the surface pressure to…
A new model is proposed for transition metals to obtain effective interionic pair potentials. The local form factor combines the empty-core model, which accounts for the nearly free electron band, and a contribution giving all the features associated with the d band obtained by an inverse scattering approach. The effe…