Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of the "chiral wall" porphyrin: a chemically robust ligand for metal-catalyzed asymmetric epoxidationsSean O'Malley and Thomas KodadekCite this: J. Am. Chem. Soc. 1989, 111, 25, 9116–9117Publication Date (Print):December 1, 1989Publication Hist…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface studies of polymer blends. 2. An ESCA and IR study of poly(methyl methacrylate)/poly(vinyl chloride) homopolymer blendsJames J. Schmidt, Joseph A. Gardella Jr., and Lawrence Salvati Jr.Cite this: Macromolecules 1989, 22, 12, 4489–4495Publication Date (Print):December…
Isolated “molecular wires” are produced in the channels of zeolites by polymerizing pyrrole with embedded FeIII or CuII ions, according to spectroscopic, stoichiometric, and kinetic investigations. The doped zeolites (zeolite Y and mordenite) display no “bulk” conductivity, but they should be useful for studying the p…
Topics covered in this book include: Sintering of silicon carbide with rare earth oxide additions; Hiping of alumina; and Liquid phase sintering of tungsten.
A cDNA clone for the catalytic subunit of murine cAMP-dependent protein kinase was placed into two expression vectors, pLWS-3 and pLSW-4. For pLWS-3, the entire coding region of the catalytic subunit was inserted into the NdeI site of pT7-7 under the control of the T7 promoter. pLWS-4 contains a polycistronic transcri…
Abstract The hydrolytic stability of a new commercial polycarbonate (Calibre 300, Dow Chemical USA) was investigated and compared with that of other commercial polycarbonates. The tests were conducted between 56% and 95% relative humidity (R. H.) at 100°C. Also performed were water immersion tests at 80 and 100°C. The…
Abstract The luminescence decay times of Tl + ‐type ions in MgS, CaS, SrS, and BaS are measured as a function of temperature from 4.2 to 150 K. By applying a three‐level model, the energy difference Δ E between the lower excited states 3 T 1u ( 3 P 1 ) and 3 A 1u ( 3 P 0 ) and the transition probabilities from the two…
Abstract Polymer blends of PEEK with PES were prepared by the solution blending method. Copolymers composed of PEEK and PES components were synthesized from these oligomers. The formation conditions exerted an influence over the molecular aggregation and the crystallization behaviors of the blend films and block copol…
Three experiments were carried out using the rhizobox system to determine the distribution of heavy metals (Cu, Zn, Mn, and Fe) across the rhizosphere of barley (Hordeum vulgare L., var. Dorirumugi). The movement of 65Zn, 54Mn, and 59Fe within the rhizosphere was also investigated. The solubility of heavy metals was e…
The possible mechanisms of particle aggregation and reduction in liquid limit of the Cochin marine clay on drying are investigated. Mineralogical analysis showed the absence of halloysite in the marine specimen. Experimental results also ruled out the possibility of cementitious material being responsible for particle…
We have measured the temperature-dependent electrical conductivity of ${\mathrm{Cu}}_{2}$O at pressures up to 500 kbar and of CuO up to 700 kbar. The high-pressure phase of ${\mathrm{Cu}}_{2}$O has a resistive thermal activation energy of a few meV and localization behavior below 7 K. No phase transitions were observe…
GeAsSeTe, GeSeTeTl, and GeSeTe glass fibers with a core-cladding structure were prepared by one of two methods: crucible drawing or preform drawing. The diameter of the core was 340 microm and that of the cladding was 440 microm. The transmission loss spectra of the fibers were measured by the cut-back method. The cru…
Abstract Hornblende of the Carrol Knob mafic complex (southern Blue Ridge Mountains, North Carolina) has weathered under humid, temperate conditions. Hornblende weathering appears to have been a dissolution-reprecipitation reaction, in which hornblende dissolved stoichiometrically, and the ferruginous and aluminous we…
N. J. Anderson, A Whole-Basin Diatom Accumulation Rate for a Small Eutrophic Lake in Northern Ireland and its Palaeoecological Implications, Journal of Ecology, Vol. 77, No. 4 (Dec., 1989), pp. 926-946
Delaminations are a principal quality problem in the manufacture of multilayer ceramic capacitors (MLC's). They are defined as a separation of the electrode and dielectric layers and can result in electrical shorts and/or life failures. Delaminations originate from many sources in MLC manufacture, but we have identifi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoinduced destabilization of bilayer vesiclesDavid A. Frankel, Henry Lamparski, Ulrich Liman, and David F. O'BrienCite this: J. Am. Chem. Soc. 1989, 111, 26, 9262–9263Publication Date (Print):December 1, 1989Publication History Published online1 May 2002Published inissue…
Abstract The thermal oxidation of polyamide 6 and 6,6 gives rise to azomethine groups (Schiff's bases) as a result of the reaction of aldehyde and ketocarbonyl groups with amino end groups. During the course of degradation, these azomethine groups react with each other in an aldol‐type condensation to produce conjugat…
Abstract The nomenclature of CaZrTi 2 O 7 minerals has become very confused, such that zirconolite, zirkelite and polymignite each have acquired multiple meanings and represent five different crystal structures. To resolve these inconsistencies, the IMA approved resolutions as follows. Zirconolite is the non- crystall…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of metal-chalcogen bonds by the reaction of metal-alkyls with silyl chalcogenidesS. M. Stuczynski, J. G. Brennan, and M. L. SteigerwaldCite this: Inorg. Chem. 1989, 28, 25, 4431–4432Publication Date (Print):December 1, 1989Publication History Published online1 May…
A general chemisorption model is proposed that yields a rate expression consistent with the quantitative structure-activity relationship (OSAR) developed by Hansch. Even complex inhibition mechanisms may be amenable to this treatment. For example, t-cinnamaldehyde (TCA) and many of its derivatives undergo slow polymer…