Materials Literature
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Abstract 1. Acid-base interactions determine adsorption and bonding of polymers to fillers. 2. Quantitative predictability of the enthalpy of such bonding is attainable from the Drago C and E equation once the C and E constants are determined for polymers and fillers. 3. Infrared and calorimetric methods are discussed…
We report the successful application of the freeze fracture technique for obtaining transmission-electron-microscope pictures of a thermotropic cholesteric material and its blue phase. It is shown that under rapid quenching these phases supercool and conserve their structure at liquid-${\mathrm{N}}_{2}$ temperature. T…
The saturation magnetization and the magnetocrystalline anisotropy were measured on single crystals in the solid solution series SrZn2-xCoxFe16O27(SrZn2-xCox-W) at 298 K and 6 K. Lattice constants and Curie-temperatures are also given as a function of the composition. The magnetocrystalline anisotropy changes from uni…
Radioactivity in fusion reactors can be effectively controlled by materials selection. The detailed relationship between the use of a material for construction of a magnetic fusion reactor and the material's characteristics important to waste disposal, safety, and system maintainability has been studied. The quantitat…
Abstract A comprehensive mathematical model for the finishing stages of polyethylene terephthalate (PET) synthesis is developed. The model takes into account the variables which have significant influences on polymerization but have not been hitherto taken into account, e.g., changing interfacial concentration and the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrically conducting polymers: arsenic pentafluoride-doped poly(phenylenevinylene) and its analogsK. D. Gourley, C. P. Lillya, J. R. Reynolds, and James C. W. ChienCite this: Macromolecules 1984, 17, 5, 1025–1033Publication Date (Print):May 1, 1984Publication History Publ…
Abstract The thermodynamic significance of the single‐ion activity is limited to its use, through a self‐consistent set of conventions, to predict accurately the activities of electrolytes. Despite this fact, single‐ion activities appear to be of increasing importance in the study of soil‐plant relationships and in th…
The consequences of the avalanche‐breakdown model during the growth of anodic tantalum oxide in electrolytes are discussed. Typical values of the injected current density at the electrolyte‐oxide interface, the impact ionization coefficient, and the electric field during anodization have been determined from the anodi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural chemistry of pentacoordinated silicon. Molecular structures of the pentafluorosilicate anion and the diphenyltrifluorosilicate anionDietmar Schomburg and Roland KrebsCite this: Inorg. Chem. 1984, 23, 10, 1378–1381Publication Date (Print):May 1, 1984Publication His…
Laboratory experiments show that the ion-molecule chemistry of phosphorus is significantly different from that of nitrogen in dense interstellar clouds. The PH<SUB>3</SUB> molecule is not readily formed by gas-phase, ion-molecule reactions in these regions. Laboratory results used in a simple kinetic model indicate th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComputer simulation of kinetics of gelation by addition polymerization in a solventRama Bansil, H. J. Herrmann, and D. StaufferCite this: Macromolecules 1984, 17, 5, 998–1004Publication Date (Print):May 1, 1984Publication History Published online1 May 2002Published inissue 1…
Abstract Interesting polyimide materials, possessing good mechanical and thermal properties, are obtained by homopolymerization or reaction of 4,′4‐bis(maleimidodiphenylmethane) with a diamine. Fourier transform infrared spectroscopy has been used to characterize the crosslinking of such materials using maleimide and…
Abstract Studies in the epoxidation of natural rubber latices are described. Investigated epoxidation routes include the use of bromohydrin intermediates, hydrogen‐peroxide‐catalyzed systems, and preformed peracetic acid. The latter reagent allows almost quantitative epoxidation of natural rubber up to high modificati…
Random fluctuations of the passive current for Fe‐Cr alloys of various Cr content were examined, in borate buffer and in the same solution with 0.1 M NaCl added. Frequency spectra of these fluctuations were recorded before and during pit initiation. No detectable fluctuations were observed in the absence of chlorides,…
TiO 2 is observed as a second phase in SrTiO 3 having Sr/Ti ≤ 0.995 (≥0.5 mol% excess TiO 2 ). The effect of excess TiO 2 on the equilibrium electrical conductivity at 1000°C is consistent with a solubility of <0.1 mol% TiO 2 with the formation of unassociated oxygen vacancies. More Ti0 2 is retained in solid solut…
Abstract The dynamic moduli of isotactic polypropylene (PP) filled with ultrafine SiO 2 and micron sized glass particles are measured in the temperature range 30–130°C at frequency 10 Hz. The storage moduli of PP composites, E′ c , increase with filler content and decreasing filler size in the whole range of temperatu…
The expression of fumarate reductase in Escherichia coli has been amplified over 30-fold by utilizing a recombinant plasmid, pFR63 , carrying the fumarate reductase operon. More than 50% of the inner-membrane protein could be accounted for by the enzyme, whereas the total amount of protein associated with the membrane…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence from picosecond transient absorption and kinetic studies of charge-transfer states in copper(II) porphyrinsDongho Kim, Dewey Holten, and Martin GoutermanCite this: J. Am. Chem. Soc. 1984, 106, 10, 2793–2798Publication Date (Print):May 1, 1984Publication History Publ…
Compositions in the series Na 1+x Zr 2 P3‐ x Si x O 12 and Na 1+4z Zr 2 ‐ z P 3 O 12 , where x = 0≤x≤1 and z=0≤z≤1/2, have thermal expansions that can be controlled (by selecting the composition) to values in the range <10×10 ‐7 in a temperature regime of a few hundred degrees. The lowest a values were obtained for…
A method of forming a laser damage resistant wide-spectrum antireflective coating on fused silica and other glasses has been developed. The single-layer graded-index coating is deposited from a specific polymer solution which is converted to a porous SiO2 film. The size of the pores in the film is first reduced by hea…