Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSix-Center Concerted Mechanism for Poly(vinyl chloride) Dehydrochlorination. Requiescat in Pace?William H. Starnes,, Joshua A. Wallach, and Hongyang YaoView Author Information Department of Chemistry and Department of Applied Scienc…
The ac conductivity and dielectric behaviors of sodium borovanadate glasses have been studied over wide ranges of composition and frequency. The dc activation energies calculated from the complex impedance plots decrease linearly with the Na 2 O concentration, indicating that ionic conductivity dominates in these glas…
Abstract Palm‐oil‐in‐water emulsions were prepared with mixtures of Tween 40 and Span 40 in various proportions. Stability and droplet‐size distribution of the emulsions were monitored. Interfacial tensions of the palm oil/water interface were also determined in the presence of these emulsifier mixtures. Emulsifying e…
Model liquid crystalline ionomers have been synthesized that consist of low molecular weight linear chains selectively end-capped at one or both end(s) with an ionic mesogenic group. ω- and α,ω-carboxylato and sulfonato polystyrene chains have been prepared by living anionic polymerization and associated with mesogeni…
The low-temperature mechanical relaxations in poly(oxy-1,4-phenyleneoxy-1,4-phenylenecarbonyl-1,4-phenylene [poly(aryl ether ether ketone, PEEK], poly(thio-1,4-phenylene) [poly(phenylene sulfide), PPS], and poly(oxy-1,4-phenylenesulfonyl-1,4-phenylene), [poly(aryl ether sulfone), PES] are investigated. All three polym…
The oxide growth rate of zirconium alloys, e.g., Zircaloy-2 and Zircaloy-4, has been proposed to be controlled mainly by the transformation of the zirconium oxide from tetragonal to monoclinic structure at some distance from the metal-oxide interface, leading to cracking. This oxide growth rate model is inconsistent w…
Fine powders in CeO2-ZrO2 system have been prepared from the precipitate mixtures of cerium (III) nitrate solution, zirconium oxychloride solution and an excess amount of ammonia under hydrothermal conditions at 180°C, and their changes in crystal phase and surface area by calcination, sinterability, the crystal phase…
Tungsten(VI) oxo alkoxides and tungsten(VI) oxo alkoxide/β-diketonate complexes are volatile precursors for the low-pressure chemical vapour deposition of tungsten oxide electrochromic films, which are characterized by SEM, XPS, XRD and cyclic voltammetry.
This paper presents the result for the local magnetic properties in a three-phase induction motor model core. The relationship between the magnetic field strength vector H and the magnetic flux density vector B, is obtained through measurements with a special sensor, which utilizes the H-coil method and the double nee…
A reliable calculation of neutron-induced activation of materials requires the inclusion of all kinematically allowed reactions and subsequent reaction chains. While neutron-induced reactions have been sufficiently covered in the past, sequential (x,n) reactions with charged particles x, produced in a first-step react…
ADVERTISEMENT RETURN TO ISSUEPREVErratumNEXTHydroperoxycycloartanes from Tillandsia recurvataGabriela M. Carbrera and Alicia M. SeldesCite this: J. Nat. Prod. 1996, 59, 10, 1002Publication Date (Web):October 22, 1996Publication History Published online22 October 1996Published inissue 1 January 1996https://doi.org/10.1…
The outcome of the reaction of metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with oxyanions is dependent both on the nature of the coordinated metal ion and on the reaction temperature. Metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with relatively electronegative chelated metal ions (CuII, NiII and FeIIICl)react…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTα−γ Disorder in Isotactic Polypropylene Crystallized under High PressureStefano V. Meille, Paul J. Phillips, Khaled Mezghani, and Sergio BrücknerView Author Information Dipartimento di Chimica, Politecnico di Milano, via Mancinelli 7, I-20131 Milano, Italy Department of Materia…
The effects of Brønsted acidity on the spatial structure and electronic properties of platinum clusters supported on zeolite Y have been examined with X-ray absorption (XANES and EXAFS) and X-ray photoelectron spectroscopy. The clusters contain 10−25 Pt atoms on average, with a nearest-neighbor distance of 2.70 ± 0.01…
Damping of the exciton absorption band of deaerated ZnO sol is directly related to the amount of silver photochemically deposited on the ZnO surface; recovery of this exciton band is achieved after the solution is exposed to air and silver oxide is formed.
Diffusion coefficients of sodium and zinc ions have been measured in bilayers of commercial, partially neutralized poly(ethylene- co -methacrylic acid). The diffusion behavior shows a break at the melting temperature of the resin, suggesting that chain backbone motion is intimately related to ionic transport. The ioni…
Regioselective Michael addition of nitro and heterocyclic compounds to levoglucosenone, 1, is effectively catalyzed by amines and also by cathodic electrolysis. In comparison to the base-catalyzed reaction, it was found that under electrochemical conditions the reaction proceeds under milder conditions and with higher…
Abstract Rietveld method has been applied to refine the structure of magnesium substituted β -tricalcium phosphate at a magnesium content of about 14 mol%. The results of the refinements, which show a final agreement factor R wp = 0.12, are in agreement with an almost complete substitution in two of the five crystallo…
A combination of quartz crystal microweighing (QCM) and infrared reflection absorption spectroscopy (IRRAS) was used to investigate the formation of ultrathin polysiloxane films on iron oxide surfaces by the adsorption of alkyltrimethoxysilanes in a humid atmosphere. It was shown that in the absence of a catalyst, onl…
Every coated fabric is unique when it comes to flame retardation because there are so many variables that can affect its use and performance. The proper formula must be worked out for each one. In this paper I have attempted to outline the basic principals of flame retardant technology. Every coated fabric will re qui…