Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetalloporphyrin .pi.-cation radicals: intrinsically ruffled or planar core conformations? Molecular structure mesitylporphinatocopper(II) hexachloroantimonateHungsun Song, Christopher A. Reed, and W. Robert ScheidtCite this: J. Am. Chem. Soc. 1989, 111, 17, 6865–6866Publica…
Synthesis and accumulation of poly(β-hydroxy-alkanoate) in Rhizobium leguminosarum, R. leguminosarum biovar. trifolii, Rhizobium ‘galega’, Rhizobium ‘hedysarum’ and R. meliloti were studied. Poly(β-hydroxybutyrate) is accumulated up to 55% of the cell dry weight. At 30–50% air saturation R. meliloti accumulates 50% of…
Stoichiometric polycrystalline magnesium aluminate spinel has been irradiated at 25° and 650°C with 2.4‐MeV Mg + ions to a fluence of 1.4 × 10 21 ions/m 2 (∼35 dpa (displacement per atom) peak damage level). Microindentation hardness measurements and transmission electron microscopy combined with energy dispersive X‐r…
Abstract Results of an investigation of isothermal crystallization and thermal behavior of poly(ethylene oxide)/poly(ethyl methacrylate) (PEO/PEMA) blends are reported. The blend composition and the crystallization temperature strongly influence the crystallization process from the melt and the melting temperature of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganolithic macromolecular materials derived from vinyl-functionalized spherosilicates: novel potentially microporous solidsPradyot A. AgaskarCite this: J. Am. Chem. Soc. 1989, 111, 17, 6858–6859Publication Date (Print):August 1, 1989Publication History Published online1 Ma…
A method of optimizing the thermally averaged structure of a defect in a crystal at a finite temperature is presented. The basic idea is to augment the interatomic forces that apply at OK with temperature-dependent contributions that arise from the minimization of the free energy at a finite temperature. The structure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilization, solutions, and processing of aromatic heterocyclic rigid rod polymers in aprotic organic solvents: poly(p-phenylene-2,6-benzobisthiazolediyl) (PBT)Samson A. Jenekhe, Paul O. Johnson, and Ashwini K. AgrawalCite this: Macromolecules 1989, 22, 8, 3216–3222Public…
A possible mechanism for regulating the lateral growth of collagen fibrils in vivo is considered. A growth inhibitor associated with a particular part of the long semiflexible collagen molecule restricts that part of the molecule to the surface of the growing assembly. Lateral accretion ceases when these inhibitors fo…
The presence of a compatibilizing agent permits the blending of otherwise incompatible polymers to yield polyblends or alloys with unique properties, generally not attainable from the individual components. Block and graft copolymers possessing segments with chemical structures or solubility parameters which are simil…
In this paper, a simple model for the charge transfer in thin-film, ac-driven electroluminescent structures of doped ZnS type is proposed. We first review the minimal assumptions needed to account for the carrier emission under high-field conditions and its subsequent feedback on the field strength; it opens the way t…
An infrared reflection technique, devised to study the structure of very thin films on substrates of high refractive index, yields an optical spectrum amplification of three orders of magnitude. With the aid of an infrared polarizer, an unanticipated peak at 1240 cm−1 in the internal reflection spectrum of thin (5–100…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(anhydrides). 3. Poly(anhydrides) based on aliphatic-aromatic diacidsAbraham J. Domb, Carlos F. Gallardo, and Robert LangerCite this: Macromolecules 1989, 22, 8, 3200–3204Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published iniss…
The isolation of an acidic protein, pI 4.5, that is abundant in turkey gizzard is described. Its apparent molecular weight measured by electrophoretic procedures is 24,000. This protein is phosphorylated by the catalytic subunit of the cAMP-dependent protein kinase and one phosphorylation site is indicated. From seque…
The electronic properties of diamond with particular emphasis on current research into the production of semiconducting films by chemical vapour deposition are reviewed. It is stressed that no method of producing n-type diamond having a conductivity appropriate to device applications has been developed to date. An ana…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSonoluminescence from nonaqueous liquids: emission from small moleculesEdward B. Flint and Kenneth S. SuslickCite this: J. Am. Chem. Soc. 1989, 111, 18, 6987–6992Publication Date (Print):August 1, 1989Publication History Published online1 May 2002Published inissue 1 August 1…
Lead magnesium sniobate, Pb(Mg 1/3 Nb 2/3 )O 3 (PMN), was prepared by a sol‐gel technique using alkoxide precursors. The hydrolysis‐condensation mechanism leads to a translucent gel which is dried under hypercritical conditions to avoid collapse of the porous texture. After drying, the aerogel exhibits a B‐deficient p…
Abstract Treating the gold—cesium as an ionic melt around 50 at% of Cs, Blum's generalized equations of asymmetric electrolytes are used to compute the partial structure factors and the total structure factors. The partial and total pair correlation function and coordination numbers are calculated from the computed st…
Abstract Raman spectra of Mg(ClO 4 ) 2 NaNCSH 2 O mixtures were analysed as a function of the concentration ratio of the components at ambient and elevated temperatures. The strong perturbation of the thiocyanate spectrum observed in the regions of the ν 1 and ν 3 vibrations is interpreted in terms of complex format…
Abstract Polycondensation of diols with phosphonic bis(dialkylamide)s leads to high‐molecular‐weight polyphosphites ( M̄ n up to 4 · 10 4 ). Model reactions of 1‐butanol, 2‐butanol and phenol with phosphonic bis(diethylamide) ( 1 ) were studied and it was established, that these reactions exhibit characteristic induct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe application of equation-of-state theories to narrow molecular-weight distribution mixtures of polystyrene and poly(vinyl methyl ether)D. J. Walsh, G. T. Dee, J. L. Halary, J. M. Ubiche, M. Millequant, J. Lesec, and L. MonnerieCite this: Macromolecules 1989, 22, 8, 3395–3…