Materials Literature
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Abstract Crystal growth rates of spherulites of β‐phase poly(propylene)s and of an ethylene/propene block copolymer, crystallized from the melt, have been investigated in the temperature range of 122 to 146°C. On the basis of the regime theory, a transition between regime II and III is found at Δ T ≈ 37–43,5 K. The nu…
Abstract A study has been made comparing the utility of fractal and Euclidean geometry in the characterization of carbon-black aggregates. The fractal models used were the perimeter-area relationship, P∼A D p /2 , and the mass fractal, M∼R D m . Values of the perimeter fractal, D p , and the mass fractal, D m , were d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBond strengths of transition-metal dimers: titanium-vanadium( TiV), vanadium dimer, titanium-cobalt (TiCo), and vanadium-nickel (VNi)Eileen M. Spain and Michael D. MorseCite this: J. Phys. Chem. 1992, 96, 6, 2479–2486Publication Date (Print):March 1, 1992Publication History…
Abstract The rate coefficients of thermal decomposition of peroxyacetic nitric anhydride (PAN) and peroxymethacrylic nitric anhydride (MPAN) were measured over the temperature range 302–323 K. The resulting Arrhenius expressions were k = 10 17.4±0.4 exp(−28.5 ± 0.5/ RT ) for PAN, and k = 10 16.2±0.7 exp(−26.8 ± 1.0/ R…
Abstract Amorphous poly(vinylpyrrolidone) (PVP) varying in molecular weight (MW) (10 000, 24 000, and 40 000) was used to study the effect of molecular weight on the glass transition temperature ( T g ). T g was measured by differential scanning calorimetry (DSC). Blends with several diluents (water, butylamine, glyci…
The microstructural changes produced by large (38 to 53 μ m), single‐crystal ZrO 2 inclusions (0, 0.09, 0.30 volume fractions, based on solid volume) within an Al 2 O 3 powder matrix were detailed as a function of constrained densification. Composite powder compacts were produced by pressure filtration for conditions…
The electrochemical impregnation of porous nickel sintered plates has been investigated to gain a better understanding of the structure, texture, and composition of the deposited active material. It was found that the nature of this material depends on the temperature of the impregnation bath. Below 60°C, an α‐type ni…
Amorphous carbon thin films were prepared at 30, 200, and 450 °C by magnetron sputtering of a graphite target. The surface structure and chemical bonding (sp2/sp3) of the carbon films were characterized by scanning tunneling microscopy (STM) and Raman spectroscopy. STM images show that graphite microcrystallites of 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and magnetic studies of a syn-anti carboxylate-bridged helix-like chain copper(II) complexEnrique Colacio, Jose Manuel Dominguez-Vera, Jean Pierre Costes, Raikko Kivekas, Jean Pierre Laurent, Jose Ruiz, and Markku SundbergCite this: Inorg. Chem. 1992, 31, 5, 774–7…
An overview of the studies of vibronic transitions in the rare earth ions is given with special attention to the intraconfigurational transitions. First the general theory is shortly reviewed, later that of the rare-earth vibronic transitions. The vibronic spectroscopy of Gd3+ is extensively dealt with, because it is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and UV-visible properties of soluble α-thiophene oligomers. Monomer to octamerJames M. Tour and Ruilian WuCite this: Macromolecules 1992, 25, 7, 1901–1907Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1…
A cell suspension culture of tobacco (Nicotiana tabacum L.) was used as a model to study injury to cells during biolistic transformation. Lawns of cells were bombarded with tungsten particles that were coated with a plasmid containing the beta-glucuronidase and the neomycin phosphotransferase II genes. When a gunpowde…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemicrystalline morphology of poly(aryl ether ether ketone)/poly(ether imide) blendsSteven D. Hudson, Don D. Davis, and Andrew J. LovingerCite this: Macromolecules 1992, 25, 6, 1759–1765Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of poly(butylene terephthalate) and its blends with polyarylateJ. Runt, D. M. Miley, X. Zhang, K. P. Gallagher, K. McFeaters, and J. FishburnCite this: Macromolecules 1992, 25, 7, 1929–1934Publication Date (Print):March 1, 1992Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the crystal phase and crystallization rate of bacterial poly(3-hydroxybutyrate-co-3-hydroxyvalerate)Mariastella Scandola, Giuseppina Ceccorulli, Maria Pizzoli, and Massimo GazzanoCite this: Macromolecules 1992, 25, 5, 1405–1410Publication Date (Print):March 1, 1992P…
Dendrite growth velocities have been measured as a function of undercooling in droplets of dilute alloys of B in Ni undercooled by up to 306 K using an electromagnetic levitation technique. At a critical undercooling, depending strongly on the B concentration, a steep rise of the dendrite growth velocity is observed.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMultiple ordered phases in a block copolymer meltK. Almdal, K. A. Koppi, F. S. Bates, and K. MortensenCite this: Macromolecules 1992, 25, 6, 1743–1751Publication Date (Print):March 1, 1992Publication History Published online1 May 2002Published inissue 1 March 1992https://pub…
Deuterium permeation studies for polycrystalline tungsten foil have been conducted to provide data for estimating tritium transport and trapping in tungsten-clad divertors proposed for advanced fusion-reactor concepts. Based on a detailed transmission electron microscopy (TEM) microstructural characterization of the s…
A mixed potential model (MPM) has been developed for calculating electrochemical potential (ECP) data for boiling water reactor (BWR) in-vessel components and recirculation piping using compositional data obtained from radiolysis water chemistry models. The calculated core component ECPs for the Duane-Arnold BWR are i…
The surface chemistry, oxidation, and disolution kinetics of titanium were measured to establish the mechanisms of passive dissolution in physiological environments. Titanium thin films were immersed in 8.0 mM ethylenediamine-tetraacetic acid in simulated interstitial electrolyte (EDTA/SIE) and maintained at 37 degree…