Materials Literature
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Abstract To identify the far-infrared (FIR) absorption bands related to K cations in micas, spectra of muscovite, phlogopite, and biotite were compared with the spectra of pyrophyllite and talc, which have no compensating cations, and to the spectra of micas in which K is substituted by mono- and divalent cations. Dic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of discrete polyenes and norbornene-polyene block copolymers using Mo(CH-t-Bu)(NAr)(O-t-Bu)2 as the initiatorL. Y. Park, R. R. Schrock, S. G. Stieglitz, and W. E. CroweCite this: Macromolecules 1991, 24, 12, 3489–3495Publication Date (Print):June 1, 1991Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDesign and synthesis of thermally labile polymers for microelectronics: poly(vinyl tert-butyl carbonate sulfone)Ying Jiang and Jean M. J. FrechetCite this: Macromolecules 1991, 24, 12, 3528–3532Publication Date (Print):June 1, 1991Publication History Published online1 May 20…
Fourier transform infrared (FT-IR) emission spectroscopy has been used to study both molybdenum oxide and supported molybdenum oxide catalysts. An infrared emission cell was specially designed to treat the samples in vacuo or in various gases over a wide temperature range (25–700°C). The experimental conditions includ…
We have conducted polarized Raman and infrared-reflectance measurements on CuO single crystals. Group theory predicts nine optical vibrations, of which three (${\mathit{A}}_{\mathit{g}}$+2${\mathit{B}}_{\mathit{g}}$) are Raman active and six (3${\mathit{A}}_{\mathit{u}}$+3${\mathit{B}}_{\mathit{u}}$) are infrared acti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of ultrathin films of aromatic polyamides and aromatic poly(amide-imides) by vapor deposition polymerizationYoshikazu Takahashi, Masayuki Iijima, Yoshiyuki Oishi, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1991, 24, 12, 3543–3546Publication Date (…
Abstract In recent years, efforts aimed at producing high‐strength polymers have intensified noticeably. In addition to additive‐based reinforcement, self‐reinforcement without additives represents a way to increase material strength. In this study, the effects of self‐reinforced polyethylene during extrusion with a c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical Young's moduli of poly(p-phenylenebenzobisthiazole) and poly(p-phenylenebenzobisoxazole)Kohji Tashiro and Masamichi KobayashiCite this: Macromolecules 1991, 24, 12, 3706–3708Publication Date (Print):June 1, 1991Publication History Published online1 May 2002Publis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure-volume-temperature properties and equations of state in polymer blends: characteristic parameters in polystyrene/poly(vinyl methyl ether) mixturesT. Ougizawa, G. T. Dee, and D. J. WalshCite this: Macromolecules 1991, 24, 13, 3834–3837Publication Date (Print):June 1,…
Abstract The association behavior of protoporphyrin IX was investigated at different pH by absorption spectroscopy and gel chromatography. Protoporphyrin IX existed as monomer in acidic water, as aggregate in neutral water, and as dimer in basic water. Poly(N-vinylpyrrolidone) tended to suppress dimerization and aggre…
In this paper, we systematically develop a hierarchy of constitutive equations at various levels of abstraction for describing the dynamics of incompressible liquid-crystalline systems. We also introduce a corresponding hierarchy of generalized bracket formulations. The simplest brackets, in terms of the direction vec…
AIN powder was synthesized from aluminum polynuclear complexes. Basic aluminum chloride and basic aluminum lactate were used as the aluminum polynuclear complexes. These starting materials and glucose were dissolved in water and mixed homogeneously. AIN powder was obtained by calcining after drying and precalcining at…
L'etude structurale des complexes du cuivre montre qu'il n'y a pas de difference geometrique importante dans les cages Cu 2 (COO) 4 entre les cuivre acetate et cuivre formiate. Les populations electroniques des groupes carboxylate des coordinats pontants sont correlees avec les valeurs −25 des carboxylate des complexe…
Abstract Oedometer swelling and compaction tests up to a maximum pressure of 32 bars were made on the Wyoming montmorillonite SWy-1 with a range of mixed (Na,K) exchange ion compositions. The permeabilities and water diffusivities of the compacted clays were calculated using soil physics theory. Significant inhibition…
The effect of surface charge on the impulse flashover of short spacers in SF/sub 6/ was investigated. A split-electrode arrangement allowed scanning of the entire space surface by a capacitive probe. With a heterocharge distribution which facilitates both inception and propagation of the discharge, the flashover level…
Abstract Lower Palaeozoic shales and slates in the External Domain of the southern Canadian Appalachians are composed predominantly of illite and chlorite with minor occurrences of I-S mixed-layer minerals (restricted to samples with illite crystallinity, IC > 0·62°Δ2 Θ ) and paragonite (restricted to samples with…
The influence of defects on the apparent phase transition temperature has been studied over a large range of defect concentrations. An interval was found for low concentrations (around 1 mol%) in which the transition temperature depends only weakly on the number of defects and where defect tails occur. This interval i…
N-Acetylneuraminate lyase produced by Escherichia coli was purified and crystallized from a genetically engineered strain (E. coli SF8/pNAL1). The enzyme showed apparent molecular masses of 105,000 Da on gel filtration and 35,000 Da on SDS/PAGE, suggesting that the enzyme is a trimer. The apparent optimum pH and tempe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComparative study of polyoxometalates and semiconductor metal oxides as catalysts. Photochemical oxidative degradation of thioethersR. Carlisle Chambers and Craig L. HillCite this: Inorg. Chem. 1991, 30, 13, 2776–2781Publication Date (Print):June 1, 1991Publication History P…
Yttria‐doped tetragonal zirconia containing 2 and 3 mol% Y 2 O 3 (Y‐TZP), and CeO 2 ‐doped Y‐TZP containing 0 to 12 mol% CeO 2 were sintered at 1350°C in a tetragonal single‐phase field for 2 h in air, and the degradation behavior at low temperature in air and in hot water was observed. X‐ray photoelectron spectroscop…