Materials Literature
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The morphology of some very small Stephanodiscus and Cyclostephanos species from Canada, USA and Europe has been studied by light and electron microscopy. The possible influence of the environment on the variation of those characters often used in the diagnosis of species is discussed and an attempt is made to improve…
Abstract Research on high‐temperature organic polymers was initiated in the late 1950s primarily to meet the needs of the aerospace and electronics industry. Since then, many different heat‐resistant polymer systems have been reported, of which several are now commercially available. These polymers are used in many di…
The heat capacities of liquid and crystalline Au-Pb-Sb alloys in the glass-forming composition range were measured with droplet emulsion and bulk samples. Based on the measured Cp data, the entropy, enthalpy, and Gibbs free-energy differences between the eutectic solid mixture and undercooled liquid were determined as…
As part of a phase II clinical trial, 14 patients with presumed intracranial neoplastic disease underwent magnetic resonance (MR) imaging before and after intravenous injection of gadolinium 1,4,7-tris(carboxymethyl)-10-(2'-hydroxypropyl)-1,4,7,10-tetraazacycl ododecane (HP-DO3A). This neutral (nonionic) gadolinium ch…
Poly(N-acetylethylenimine) (polyoxazoline) (POZO) with a terminal triethoxysilyl group was successfully synthesized by the ring-opening polymerization of 2-methyl-2-oxazoline followed by termination with 3-aminopropyltriethoxysilane. Triethoxysilyl-terminated telechelic POZO was prepared by using a bifunctional initia…
We present results of resonant-photoemission and high-resolution x-ray-photoemission-spectroscopy (XPS) studies on single-crystalline CuO, which confirms most of the earlier data obtained from polycrystalline samples. However, some minor differences with earlier results were also observed, which are concentrated on a…
Ultrafine Si 3 N 4 and Si 3 N 4 + SiC mixed powders were synthesized through thermal plasma chemical vapor deposition (CVD) using a hybrid plasma which was characterized by the superposition of a radio‐frequency plasma and an arc jet. The reactant, SiCl 4 , was injected into an arc jet and completely decomposed in a h…
Abstract Nine rigid rod ester monomers endcapped with maleimide, nadimide, and methylnadimide groups were prepared and studied by DSC and hot stage polarized light microscopy. All of the monomers showed thermotropic nematic liquid crystalline phases and could be thermally crosslinked in the nematic phase. The nematic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResolution of a long-standing problem in elemental sulfur chemistry: a theoretical study of tetrasulfurGeoffrey E. Quelch, Henry F. Schaefer III, and Colin J. MarsdenCite this: J. Am. Chem. Soc. 1990, 112, 24, 8719–8733Publication Date (Print):November 1, 1990Publication His…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute solution properties of semiflexible poly(substituted methylenes): intrinsic viscosity of poly(diisopropyl fumarate) in benzeneAkikazu Matsumoto, Tetsuya Tarui, and Takayuki OtsuCite this: Macromolecules 1990, 23, 24, 5102–5105Publication Date (Print):November 1, 1990P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMixed aggregates: crystal structures of a lithium ketone enolate/lithium amide and of a sodium ester enolate/sodium amidePaul G. Williard and Mark J. HintzeCite this: J. Am. Chem. Soc. 1990, 112, 23, 8602–8604Publication Date (Print):November 1, 1990Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of six lead(II) dialkoxides, x-ray crystal structures of [Pb(.mu.,.eta.1-OCH2CH2OMe)2].infin. and [Pb3(.mu.-O-tert-Bu)6], and hydrolysis studiesSubhash C. Goel, Michael Y. Chiang, and William E. BuhroCite this: Inorg. Chem. 1990, 29, 23, 4640–4646Publication Date…
Abstract A new highly phenylated heterocyclic diamine, 3,4‐bis(4‐aminophenyl)‐2,5‐diphenylfuran, was synthesized in three steps from 4–‐nitrodeoxybenzoin. The low temperature solution polycondensation of the diamine with various aromatic diacid chlorides afforded tetraphenylfuran‐containing aromatic polyamides with in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface tension of poly[(3,3,4,4,5,5,6,6,6-nonafluorohexyl)methylsiloxane]Hideki Kobayashi and Michael J. OwenCite this: Macromolecules 1990, 23, 23, 4929–4933Publication Date (Print):November 1, 1990Publication History Published online1 May 2002Published inissue 1 November…
Abstract Samples of new and weathered utility lumber pressure-treated with chromated copper arsenate (CCA) were tested for leaching of copper, chromium and arsenic by submersion in leaching baths of various pH levels. Accumulation of metals was monitored in leachate at pH 3.5, 4.5, 5.5, 7.0 and 8.5 over a period of 40…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDNA-metal binding by antitumor-active metallocene dichlorides from inductively coupled plasma spectroscopy analysis: titanocene dichloride forms DNA-Cp2Ti or DNA-CpTi adducts depending on pHMark L. McLaughlin, John M. Cronan Jr., Tamara R. Schaller, and Ronald D. SnellingCit…
A technique for measuring stress (positive and negative) with a lateral spatial extent of approximately 2 μm is introduced. The technique, implemented using a Raman microprobe, is demonstrated with measurements of the frequency shift of the sharp, R‐luminescence lines (2Ā and Ē to 4 A 2 radiative transitions) in, and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermally stimulated current and dielectric studies of poly(aryl ether ketone ketone)Bryan B. Sauer, Peter Avakian, Howard W. Starkweather Jr., and Ben S. HsiaoCite this: Macromolecules 1990, 23, 24, 5119–5126Publication Date (Print):November 1, 1990Publication History Publi…
Abstract A series of rigid rod amide monomers based on 2,2′‐disubstituted‐4,4′‐diaminobiphenyl were prepared and characterized by DSC and hot stage polarized light microscopy. The monomers were endcapped with maleimide, nadimide, and methylnadimide functionalities. With one exception, all of the materials could be the…
Through close control over green‐state powder processing, pure alumina ceramics of 0.5‐μm grain size were obtained by sintering at 1250°C. The static grain growth of this material was modest at temperatures below 1300°C. However, dynamic grain growth occurred rapidly during superplastic deformation. Therefore, althoug…