Materials Literature
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The capillary flow porometry(CFP)technique, known as the bubble point method, has been applied to measure the entire pore size distribution (PSD)of nonwoven geotextiles. The classical technique is based on the differential analysis of two test runs: a wet run, during which the specimen is saturated by a wetting fluid,…
Abstract Twelve bacterial isolates, four of them assigned to the genus Acinetobacter , were taken from sewage of a treatment plant with Enhanced Biological Phosphorus Removal (EBPR) and screened for phosphorus uptake, polyphosphate (polyP) accumulation and adsorption under limited carbon and nitrogen conditions. In ad…
The catalytic effect of dielectric packings inside the discharge gap on the yield of ozone generation was studied under silent discharge conditions. Porous silica of developed internal surface and quartz glass grains were used as the packings. In the presence of coarser grains of both materials, higher ozone concentra…
The new material is composed of alternating bonded layers of high strength aluminum sheets and unidirectional hybrid FRP layers. A hybrid FRP layer is also composed of a CFRP layer sandwiched in between two KFRP layers. The CFRP layers prevent kink band formation in the KFRP layers. The KFRP layers prevent growth of m…
The polyethylene powders studied were synthesized by both slurry and gas-phase processes at temperatures ranging between 30 and 85 °C. Fibers were drawn from these nascent powders under identical processing conditions. The maximum achievable draw ratio was found to be strongly dependent on synthesis conditions. Highes…
We discuss macroemulsions stabilized by silver interfacial colloidal films and the effect of dithizone on them. These emulsions are characterized by a very sharp size distribution. We find that dithizone, which is known for its strong interaction with silver, strongly affects the state of flocculation of the colloid.…
The charge transfer (CT) excited states of Ru(II)OEP(Py) 2 and Ru(II)TPP(Py) 2 (TPP = tetraphenylporphyrin, OEP = octaethylporphyrin, and Py = pyridine) have been investigated by nanosecond time-resolved resonance Raman (TR 3 ) spectroscopy. The spectra reveal unexpected differences between the two species. The TR 3 s…
The tetranuclear copper(II) complex [{Cu(O2CMe)(OMe)}4] has been found to contain an unusual open cubane Cu4O4 framework defined by two interpenetrating copper and oxygen planes rather than two tetrahedra; it also shows strong antiferromagnetic coupling.
Abstract Ordered polymeric networks are produced via the photopolymerization of liquid‐crystalline (LC) diacrylates. When these diacrylates are derived from aromatic rings, the networks show UV‐light instability. In order to overcome this problem, the cyclohexane analogues of two of these LC diacrylates were synthesiz…
Thiophene-fused DCNQI compounds yield conducting CuI complexes built up of a unique three-dimensional supramolecular coordination structure in which the zigzag ladder CuI polymers are bridged by the π-stacked acceptors as a bidentate ligand.
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAbsence of Noncyclic Imide Formation in PMDA−ODA PolyimideJ. M. Konieczny and S. L. WunderView Author Information Department of Chemistry, 016-00, Temple University, Philadelphia, Pennsylvania 19122 Cite this: Macromolecules 1996, 29, 23, 7613–7615Publication Date (Web):Novembe…
Structures of new low-spin oxo-bridged complexes of bis[(diphenylboryl)dimethylglyoximato]iron, Fe((DMG)BPh 2 ) 2, are reported. The pentacoordinate complex, 1 = [Fe((DMG)BPh 2 ) 2 ] 2 O, contains a bent Fe−O−Fe bridge (166.0°) with the irons each displaced 0.3 Å out of the N 4 planes toward the oxo ligand. The Fe−μ-O…
For the introduction of vinyl groups at the Si atom of the siloxanic chain, copolymerization of octamethylcyclotetrasioloxane (D4) with 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane (V4) was performed. Vionit CS-34 C, a styrene-divinylbenzene copolymer with SO3H groups, was used as catalyst. To estimate the…
The objective of this paper is to present recent modifications to the Bodner-Partom viscoplastic equations for improved prediction of strain rate and temperature effects on the plastic flow behavior of metals. The thermal softening and strain hardening characteristics widely differ from metal to metal. For example, ex…
The steric effect on the first order hyperpolarizability of the β-nitrostyrene derivatives has been investigated by comparing the β values and the dihedral angles between the aryl and nitroalkenyl groups. In general the β value increased with the electron-donating ability of the substituent. The larger β value for 3,4…
A study of the base-catalyzed alkylation of p-tert -butylcalix[5]arene ( 1 ) with 2-(chloromethyl)pyridine hydrochloride (PicCl·HCl) in DMF has led to the isolation and identification of the 7 possible pyridinyl homologues of 1 in the cone conformation. Reactions of 1 with limiting amounts of alkylating agent (2 to 4…
Ethylene-propylene elastomers (EPR and EPDM), which generate free radicals at considerable rate during gamma irradiation, show the competition between crosslinking and degradation of these materials in the temperature range from 130 °C to 150 °C. The overall effect of simultaneous processes on the studied polymers is…
The rate of zinc vaporization from galvanized scrap was measured using a thermogravimetric apparatus along with chemical analysis. It is found that the rate of zinc vaporization is very fast in nitrogen and carbon monoxide atmospheres at temperatures higher then 950°C. At lower temperature rate decreases with decreasi…
Cellular interaction and platelet adsorption were investigated on poly(ethylene oxide) (PEO) immobilized silicone rubber membrane (SR) which has polyacrylic acid grafts on the surfaces. Polyacrylic acid (PAA) had been introduced to the SR surface after Ar plasma treatment of SR surfaces to introduce peroxide groups. S…
Creep behavior has been investigated with high purity platinum (99.999 mass%) at high temperatures from 1373K up to 1773K. Stress and temperature dependence of the creep rate has been discussed in detail by using microscopic observations and X-Ray diffraction measurements. Platinum shows the power-law creep with the s…