Materials Literature
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The properties of the nematic-isotropic interface of some members of the homologous series of 4-cyano-4\ensuremath{'}-($n$-alkyl)biphenyl liquid crystals [$n$-pentyl (5CB), $n$-hexyl (6CB), $n$-heptyl (7CB), and $n$-octyl (8CB)] are studied by optical reflectometry. The thickness of the interface is obtained by measur…
Sulfolobus solfataricus is a thermophilic archaebacterium able to grow at 87 degrees C and pH 3.5 on glucose as sole carbon source. The organism metabolizes glucose by two main routes. The first route involves an ATP-dependent phosphorylation to give glucose 6-phosphate, which readily isomerizes to fructose 6-phosphat…
Abstract An experimental study of the development of phase morphology in incompatible polymer melt blends of polyethylene/polystyrene (PE/PS), polyethylene/polycarbonate (PE/PC), and polyethylene/nylon‐6 (PE/N6) is presented. Different temperatures (180°C, 240°C) of mixing and polyethylene molecular‐ weight levels wer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of cis- and trans-1,3,5,7-tetranitro-1,3,5,7-tetraazadecalinRodney L. WillerCite this: J. Org. Chem. 1984, 49, 26, 5150–5154Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 December 1984https://pubs.acs.org/…
Abstract A new molecular mechanism for the healing phenomenon in semicrystalline linear polycondensates (healing resulting from chemical reactions between macromolecules located in the interfacial surface) is demonstrated. Strips of commercial poly(ethylene terephthalate) are annealed at 258°C in order to avoid melt s…
Abstract The process developed in the UK to produce magnesium hydroxide from seawater is described, together with the heat treatment that the hydroxide receives to produce the active oxide. Some of the characteristics required of the dolomite used in the process are also discussed. Impurities introduced by the seawate…
The consequences of differences in the intramolecular force constants and the ionic entropies between the oxidized and reduced states of aquo redox couples upon their electrochemical kinetics are examined as a function of the driving force. A generalized harmonic oscillator model is utilized that involves estimating t…
Schon Tageslicht bewirkt die Umlagerung des Dihydroazulens 1 in das 8—Vinylheptafulven 2; thermisch läuft die Reaktion in umgekehrter Richtung ab. Das Verhalten von 1 wird stark von den Resten R bestimmt. Der Reaktionscyclus könnte Anwendung bei der Informationsspeicherung finden.
The rates of reaction of 3CaO. Al 2 O 3 , in sulfate‐containing solutions of three compositions were investigated. It was observed that the rates of calcium and sulfate uptake decreased with increasing calcium hydroxide concentration. In a further experiment using a calcium sulfate solution, which also contained NaOH,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of composition and cross-link functionality on the elastomeric properties of bimodal networksM. Y. Tang and James E. MarkCite this: Macromolecules 1984, 17, 12, 2616–2619Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published i…
This paper presents a new analysis of the jet stripping process, as used to control coating thicknesses in the paper, photographic and galvanizing industries, and demonstrates that the inclusion of a surface shear stress term, acting in conjunction with the pressure gradient on the coating, gives theoretical predictio…
Radiation-induced optical absorption bands in pure synthetic silica-core fibers were studied. The effect of Cl contamination on the absorption change of the irradiated fibers in relation to the radiation resistance was examined, and it was deduced that low-Cl fibers have good radiation resistance even when they have a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleSurface modification of poly(tetrafluoroethylene) with benzoin dianionChristine A. Costello and Thomas J. McCarthyCite this: Macromolecules 1984, 17, 12, 2940–2942Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 December…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of (RS)- and (R)-α-methylene-γ-methyl-γ-butyrolactoneJ. Suenaga, D. M. Sutherlin, and John K. StilleCite this: Macromolecules 1984, 17, 12, 2913–2916Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 Dece…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of ABA triblock copolymers of iε-caprolactone and DL-lactideC. X. Song and X. D. FengCite this: Macromolecules 1984, 17, 12, 2764–2767Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 December 1984https://pub…
The electrical conductivity of several sintered yttria ceramics with different levels of lower valent cation impurities was studied as a function of the partial pressure of water vapor (3 to 1600 Pa) at 500° to 1300°C in oxygen or air. At the higher temperatures yttria is a P ‐type conductor, but at the lowest tempera…
Glass formation limits were determined for the lanthanum borate glasses. Stable immiscibility prevents the formation of clear glasses over the range 0 to 20 mol% La 2 O 3 , but excellent quality glasses could be formed between 20 and 28 mol% La 2 O 3 . Data are reported for the density, refractive index, thermal expan…
An alternative description of zirconolite, zirkelite, pyrochlore and polymignyte as modular structures is proposed. This approach not only emphasizes their crystallographic similarities but is also readily extended to include defects which were observed by high resolution electron microscopy. Each module consists of t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRuthenium tetraoxide staining of polymers: new preparative methods for electron microscopyJohn S. TrentCite this: Macromolecules 1984, 17, 12, 2930–2931Publication Date (Print):December 1, 1984Publication History Published online1 May 2002Published inissue 1 December 1984htt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of chloro(phthalocyaninato)gallium(III), Ga(Pc)Cl, and chloro(phthalocyaninato)aluminum(III), Al(Pc)ClKenneth J. WynneCite this: Inorg. Chem. 1984, 23, 26, 4658–4663Publication Date (Print):December 1, 1984Publication History Published online1…