Materials Literature
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Abstract The polyimides based on 3,3′,4,4′‐biphenyltetracarboxylic dianhydride (BPDA) described in Part I of this series were dissolved in p ‐chlorophenol and spun into fibers using a coagulating bath of ethanol. The fibers as spun had in general low tenacities and low moduli, but a heat treatment at 300–500°C under t…
Abstract The application of UHV surface analytical methods to the study of electrodes and surface layers may be affected by changes introduced by contact with the laboratory atmosphere. Therefore, a specimen preparation and transfer in a closed system with its specifications is described. Three examples of its applica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpin states in iron(III) phthalocyanines studied by Moessbauer, magnetic susceptibility, and ESR measurementsBrendan J. Kennedy, Keith S. Murray, Peter R. Zwack, Heinrich Homborg, and Winfried KalzCite this: Inorg. Chem. 1986, 25, 15, 2539–2545Publication Date (Print):July 1…
Abstract Blends of isotactic polypropylene and polyethylene or polyamides often display highly unusual crystalline morphologies in which the chain axes of the helical and linear polymers are at large angles to each other. These crystalline morphologies are explained on the basis of a specific epitaxial relationship th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPronounced proton and phosphorus-31 NMR spectral changes on meso-tetrakis(N-methylpyridinium-4-yl)porphyrin binding to poly[d(G-C)].cntdot.poly[d(G-C)] and to three tetradecaoligodeoxyribonucleotides: evidence for symmetric, selective binding to 5'CG3' sequencesLuigi G. Marz…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTVapor pressures of poly(dimethylsiloxane) oligomersOra L. FlaningamCite this: J. Chem. Eng. Data 1986, 31, 3, 266–272Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://doi.org/10.1021/je00045a002RIGHTS & PE…
The expansion factors for the mean-square end-to-end distance and radius of gyration are studied for the helical worm-like (HW) chain with the excluded-volume effects incorporated in the Yamakawa–Stockmayer scheme. In this scheme, approximate closed expressions for them are expressed in terms of the excluded-volume pa…
We review the crystallography, band structure, and optical, electrical, and magnetic properties of diluted magnetic semiconductors (DMS), with emphasis on ternary alloys of the type AII1−xMnxBVI (e.g., Hg1−xMnxTe). Considerable attention in the review is given to spectacular novel effects which arise from the selectiv…
Because the atmospheric corrosion products that form on the surface of Al, Zn, and AlZn hot-dip coatings on sheet steel are difficult to characterize, they have not been extensively studied In the past. In this study, the composition and structure of products formed in industrial and marine environments were identifie…
Ceramics of undoped SrTiO3 and BaTiO3 (at T > Tc) show a pronounced Maxwell-Wagner relaxation at ultra low frequencies. This indicates thin nonconducting barrier layers at the grain boundaries and some residual conductivity in the grain. Degradation of the ceramic starts when the electrical field, which develops at th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of hydrogen ion activity and general acid-base catalysis on the rate of decomposition of hydrogen peroxide by a novel nonaggregating water-soluble iron(III) tetraphenylporphyrin derivativeMatthias F. Zipplies, William A. Lee, and Thomas C. BruiceCite this: J. Am. C…
The defect structure in 3 mol% Y‐TZP was studied by correlated internal friction, dielectric loss, and ionic conductivity experiments. A prominent mechanical and dielectric loss peak occurs in the temperature range between 380 and 550 K that depends on the frequency of measurement. The relaxation parameters were deter…
Abstract Model butanediol–MDI–polypropylene oxide polymers have been synthesized to explore the structure–property relationships in urethane/polyether polymers. The results of mechanical, thermal, and spectroscopic analyses agree remarkably well. The phase mixing in these polymers decreases with increasing hard‐segmen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFirst structural characterization of a boron-centered radical: x-ray crystal structure of [Li(12-crown-4)2]+ [BMes3]-.bul.Marilyn M. Olmstead and Philip P. PowerCite this: J. Am. Chem. Soc. 1986, 108, 14, 4235–4236Publication Date (Print):July 1, 1986Publication History Publ…
Electrical conduction phenomena in polyimide (Kapton) films were studied with particular attention devoted to the separation of interface and bulk phenomena. The measurements were carried out with a variety of methods in the temperature range of 50 to 270 °C at electrical fields of 104 to 6×105 V/cm and at time interv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoordination of lanthanides by two polyamino polycarboxylic macrocycles: formation of highly stable lanthanide complexesM. F. Loncin, J. F. Desreux, and E. MercinyCite this: Inorg. Chem. 1986, 25, 15, 2646–2648Publication Date (Print):July 1, 1986Publication History Publishe…
Abstract Various acidic compounds were tested as potential initiators of the cationic polymerization of L,L ‐dilactide. Regardless of solvent and temperature only trifluoromethanesulfonic acid and methyl triflate proved to be useful initiators. With methyl triflate as initiator L,L ‐dilactide polymerizes faster than d…
peer reviewed
Layering transitions of colloidal crystals confined between two smooth glass surfaces have been studied by transmission diffraction of light as well as direct-lattice imaging with an optical microscope. The polystyrene spheres we studied have diameter \ensuremath{\Phi}=0.305 \ensuremath{\mu}m and a surface charge of \…
We have measured, as a function of temperature and frequency, the velocity and attenuation of ultrasound near the glass transition of glycerol. The data are compared with that from frequency-dependent specific-heat measurements recently performed on the same sample. When the difference between adiabatic and isothermal…