Materials Literature
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The solubilities of calcium hemicarboaluminate, calcium monocarboaluminate and calcium tricarboaluminate have been determined and the equilibrium phase diagram for the CaO-Al 2 O 3 -CaCO 3 -H 2 O closed system at 25°C has been calculated. Six isothermally invariant points have been located involving six stable hydrate…
A self-doped conducting polymer having alkanesulphonic acid groups on polythiophene has been directly synthesized from sodium 3-(3-thienyl)propanesulphonate 3 by chemical polymerization with FeCl3 in an aqueous medium; the resulting acid form of this polymer after work-up shows highly self-doped behaviour both in wate…
Glyoxal condensed with 1,4-diformyl-2,3,5,6-tetrahydroxypiperazie in the presence of sulfuric and nitric acids to give the title compound.We wish to repon 4.10-diniuo-2,6,8,12-letraoxa-4,lO-diazatetracyclo[5.5.0.~~~O~~'~ldodecan (2) as the fxst example of a dioxaazepane and the densest dinitramine (including dinitrami…
The kinetics of first-order diamagnetic phase transitions into a Condon domain phase, which may occur in normal metals under a strong magnetic field, is considered. Expressions for profile, velocity, and width of the interface between the homogeneous and diamagnetic domain phase are obtained. Critical sizes of cluster…
Uranium dioxide fuels irradiated in a commercial BWR during 1 to 4 cycles (burn-up: 6–28 GWd/t) have been annealed in an out-of-pile condition and the release rate of 85Kr was measured continuously. The annealing temperature ranged 1,500–1,800°C. The effects of temperature and burn-up have been studied on burst releas…
AC and impulse voltages were applied to needle electrode specimens modeling the interface of the semiconducting layer and insulation of XLPE (cross-linked polyethylene) cables. TEM (transmission electron microscope) photographs of minute trees (>
The structure and behaviour of Ru3(CO)12 supported on inorganic oxides such as V2O5, SiO2, TiO2, Al2O3, K-Al2O3, MgO and MnO2 have been studied by means of EXAFS, IR and TPD. Ru3(CO)12 was physisorbed on V2O5, SiO2, and TiO2, whereas [Ru3(CO)10(µ-H)(µ-O)] and [HRu3(CO)11]– were formed on Al2O3 and the basic supports M…
Abstract The ring‐opening polymerization of D, L ‐dilactide and an equimolar dilactide‐diglycolide mixture has been investigated. Conversion and molecular weight in the lactide bulk polymerization are determined not only by the kinetics of the primary ring‐opening reaction, but also by the concentration and extent of…
The catalytic behaviour of H5PV2Mo10O40 heteropoly acid in the oxidation of n-butane to maleic anhydride is analysed in relation to that of its partially salified Cs salt and their FTIR spectra, UV–VIS diffuse reflectance spectra, thermogravimetry and reducibility tests as well as solid state 51V NMR and EPR character…
The development of the various partial-discharge test methods as applied to cables, capacitors transformers, and rotating machines is examined in an historical context. Special emphasis is placed on various discharge pulse analysis techniques, although it is pointed out that integrated charge measurements should recei…
A graphite/polymer composite material was directly coupled with: 2014 aluminum (bare and hard-anodized), pure grade titanium, 316 stainless steel and monel. Samples were then immersed in natural seawater. The titanium couple was inactive. Stain less steel and monel changed behavior from noncorroding to crevice and pit…
Iron porphyrins that are modified on both faces by chiral binaphthalenes catalysed asymmetric oxidation of sulphides in fair to good enantiomeric excesses and excellent turnover numbers of the catalysts in the presence of 1-methylimidazole.
Abstract Polyurethane (PU) films were prepared by solution casting using a three‐component system consisting of a low molecular weight fraction of softwood kraft lignin (KL), polyethylene glycol (PEG) of various molecular weights, and crude diphenylmethane diisocyanate (MDI) as starting materials. All films were prepa…
Abstract Clay minerals provide information on the burial and thermal history of sedimentary rocks that is useful in the exploration, evaluation, and production of hydrocarbons. In particular, changes in clay minerals may be used as geothermometers that record temperatures corresponding to various stages of hydrocarbon…
The structure of the passive film that protects iron and iron/chromium alloys from corrosion has been investigated in situ in an aqueous environment using X-ray absorption spectroscopy, with fluorescence yield detection. From an analysis of the EXAFS and XANES it has been shown that the film formed on iron consists of…
We have studied the behavior of a cholesteric liquid crystal sandwiched between two plates, with homeotropic anchoring, in the presence of an electric field. By changing two control parameters, namely the sample thickness and the electric field magnitude, we were able to characterize different types of solutions : a n…
Poly (L-lactic acid) microcapsules were prepared using an emulsification and organic solvent evaporation technique (w/o system) with phenobarbitone as a reference core. Three polymers of different molecular weight (61,300; 43,200, 2400), were used to prepare different core loaded microcapsules. Microcapsule size incre…
The food industry is interested in polyelectrolytic coagulants of natural origin for the clarification of food beverages and the recovery of colloidal and dispersed particles from processing waste streams. This paper discusses potential industrial applications of recent findings on polymer complex formation obtained w…
Abstract The structure of rigid-chain polyesters and polyamides which possess flexible side chains consisting of methylene or 1,4,7-trioxaoctyl oxide units have been investigated by means of X-ray scattering. The X-ray studies were performed on fibres and monodomains. Additional information was gained from calorimetri…
Unusual regioselectivity towards internal allylic double bonds in preference to terminal allylic double bonds is displayed using the newly synthesized vanadium-pillared montmorillonite catalyst.