Materials Literature
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L'oxydation sous air a haute temperature des alliages base titane α de type IMI 834 et TIMETAL 1100 conduit a la formation de couches oxydees non protectrices. Par ailleurs, la solubilisation d'oxygene dans l'alliage fragilise ce dernier en diminuant sa ductilite. Une amelioration de la tenue a l'oxydation et une prev…
This paper is the first part of a series reporting on the recent development of a yarn modification process to produce torque-balanced singles spun yarns. Taking advantage of the core-sheath structure of unconventionally spun yarns, we have developed a yarn modification process and applied it to singles yarns spun by…
The kinetics of thermal decomposition of epoxy resin are investigated under various heating rates (2, 5, 10, and 20 K/min) and oxygen concentrations (5, 10, and 20%) in the nitrogen-oxygen atmosphere by means of thermogravimetric measurements. Results show that, unlike only one stage of reaction in the inert atmospher…
A new computer model is developed to predict the tensile behavior of nonwoven fabrics from the stress-strain behavior of their constituent fibers and distributions of fiber orientation angles. The finite element method is used to calculate the numerical solution of stress and strain distribution in different regions o…
Two new puriniums, heteromines D (4) and E (5), and three new pyrimidines, heteromines F (6), G (7), and H (8), were isolated from the aerial parts of Heterostemma brownii Hay. Their structures were determined as 7,9-dimethyl-2-(N,N-dimethylamino)guaninium chloride, 7,9-dimethyl-2-(N-methylamino)guaninium chloride, 6-…
Abstract A new class of biodegradable copolyesters was prepared by polycondensation of sebacoyl chloride with mixtures of silylated isosorbide and silylated O , O ′‐bis(2‐hydroxyethyl)hydroquinone in bulk. A class of poly(ester‐anhydride)s was synthesized from sebacoyl chloride and mixtures of silylated O , O ′‐bis(2‐…
Raman and infrared spectra of a bisphenol-A-containing azoaromatic polyether, a bisphenol-A-containing azoxyaromatic polyether and a bisphenol-A-containing 2-hydroxyazoaromatic polyether were analyzed. Vibrational spectra were also collected for the corresponding model compounds 4,4′-(4-tert-butylphenoxy)azobenzene, 4…
Strengths and Weibull moduli for alumina/yttrium aluminum garnet eutectic (AYE) filaments and for Si‐C‐O (Nicalon TM ) filaments were calculated using measured and average filament diameters. The strengths agreed closely. Thus an average filament diameter could be used instead of the measured filament diameter in calc…
Abstract Self‐doped polyaniline modified electrodes were successfully fabricated by copolymerization of aniline and m ‐aminobenzoic acid in 0.5 mol L −1 sulfuric acid. The electrochemical characteristics of this resulting polymer were investigated. The polymer displayed electrochemical activity with the formal potenti…
A novel polymeric organosilicon gel with the composition [MeSi(NCN)1.5]n synthesized by the reaction of MeSiCl3 with Me3Si–N=C=N–SiMe3 is reported. The reaction is performed without any solvent and with catalytic amounts of pyridine and provides highly cross-linked poly(methylsilsesquicarbodi-imide) in the form of a s…
In the TiO 2 ‐SiO 2 system, anatase solid solutions (ss) containing up to similar/congruent ∼15 mol% SiO 2 are formed in the as‐prepared state by the hydrazine method. The lattice parameters a and c decrease linearly from 0.3785 to 0.3776 nm and from 0.9514 to 0.9494 nm, respectively, with increased SiO 2 content. At…
We report on an experimental and numerical study of tilted dendrites observed in thin-film directional solidification of a ${\mathrm{CBr}}_{4}{--8\mathrm{}\mathrm{mol}\mathrm{}%\mathrm{}\mathrm{C}}_{2}{\mathrm{Cl}}_{6}$ alloy for an arbitrary orientation of the crystal with respect to the plane of the sample and the p…
Using the bond-valence model, a relationship is developed between the thermal expansion of a chemical bond, its amplitude of thermal vibration and its force constant. An empirical expression found between bond valence and the force constants derived from vibrational spectroscopy allows all of these quantities to be pr…
Isothermal crystallization kinetics in the miscible mixtures of poly(ε-caprolactone) (PCL) and poly(styrene- co -acrylonitrile) (SAN) have been investigated as a function of the composition and the crystallization temperature by optical microscopy. The radial growth rates of the spherulites have been described by a ki…
Two novel metal alkoxide-derived routes were developed for the synthesis of nanocrystalline CdSe layers with quantum dot sizes between 1 and 4 nm. The first route, where cadmium ethoxy−acetate is reacted with bis(trimethylsilyl)selenium in the presence of aminopropyltriethoxysilane (AMEO), yields highly concentrated a…
The adsorption of mussel adhesive protein (MAP) from the marine mussel Mytilus edulis has been investigated on polystyrene (PS) and poly(octadecyl methacrylate) (POMA) surfaces using angle dependent X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). AFM images previously published in the dehydra…
We report the optical properties of nanosized (≈4 nm) platinum particles synthesized in water-in-oil (w/o) microemulsions. The particles present a maximum at 220−256 nm, being highly position dependent upon the reaction medium. The aging of solutions causes cluster formation, whose absorption spectrum is rather differ…
The structures and intramolecular dynamics of [Ln(EGTA)(H 2 O)] - (Ln = La 3+, Ce 3+, Pr 3+, Nd 3+, Sm 3+, Eu 3+, Gd 3+, Tb 3+, Dy 3+, Ho 3+, Er 3+, Tm 3+, Yb 3+, Lu 3+ and EGTA 4 - = 3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazatetradecanedioate(4−)) in aqueous solution have been investigated by variable temperature 1…
Definite increases in the Curie point (T C ) of undoped and lanthanum‐ (La‐) doped (<0.5 at.%) barium titanate (BaTiO 3 ) ceramics sintered at elevated temperatures in the range of 1300°‐1450°C were observed. Both undoped and 0.3 at.% La‐doped BaTiO 3 (chosen as a typical doping concentration to yield semiconductin…
Abstract Motion of the guest molecules in kaolinite/dimethyl sulfoxide (DMSO) intercalation compounds Al 2 Si 2 O 5 (OH) 4 ∙(CH 3 ) 2 SO has been studied by means of solid-state nuclear magnetic resonance (NMR) in the temperature range between 300 and 380 K, which is just below the evolution temperature. The 13 C magi…