Materials Literature
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Pressure-induced structural transformation in ${\mathrm{SiO}}_{2}$ glass is investigated with molecular dynamics. At high densities, the height of the first sharp diffraction peak is considerably diminished, its position changes from 1.6 to 2.2 A${\mathrm{\r{}}}^{\mathrm{\ensuremath{-}}1}$, and a new peak appears at 2…
Here we demonstrate the first evidence that phase separation in polymer solutions could be essentially different from that in binary liquid systems. This difference is likely to originate from the strong asymmetry in molecular dynamics between the two separated phases. When the rheological time of the polymer-rich pha…
Abstract The in situ epoxidation of natural rubber latex was successfully performed in chain‐scissoring conditions. The chain‐scissoring process could be carried out simultaneously or successively to the epoxidation, to a determined extent. The rate and the degree of epoxidation depend on temperature, pH, and H 2 O 2…
He growth during an experiment were adequate except near the triple point.
Abstract This paper presents the influence of glass fibres on crystallization kinetics and on matrix morphology for poly(ethylene terephthalate) (PET)/glass fibre composites. The following parameters are also considered: fusion‐crystallization conditions, thermal stability and the addition of nucleating agents in the…
Composites combine the properties of two or more components. Conceptual tools are developed which guide the selection of components for making composites which maximise one or more aspect of thermo-mechanical performance.
The results reported indicate that the properties of polyurethanes elastomers can be tailored to serve a wide variety of applications, for low temperature uses as well. The glass transition temperatures of the soft segments (T gs ) which control the low temperature properties of polyurethane elastomers, ranged from -7…
A general model and analytical results have been derived to obtain laser-induced temperature rise in substrates with periodic multilayer structures. The substrate can be equivalent to a homogeneous substrate with anisotropic thermal conductivity, if the dimension of the periodic structure is much smaller than the lase…
By using Auger electron spectroscopy (AES) to obtain chemical information from the fractured surfaces of rapidly quenched and sintered NdFeB magnets, it is found that the Nd-rich phases in the grain boundaries are different in these two kinds of magnets. In rapidly quenched NdFeB magnets, the Nd-rich phase is mainly N…
It is argued that the sintering and densification of Si3N4 based ceramics, using transition metal or rare earth metal oxide additives, can be described as an electronic mechanism involving a transfer of electrons into the Si3N4–SiO2 valence band: this is consistent with a recently proposed model of bonding at metal/ce…
The effects of HDDR (hydrogenation decomposition desorption recombination) phenomena on the magnetic properties of SmFe11Ti, SmFe10MM', NdFe11Ti, and Nd1+δFe10MM' (δ=0, 0.3, M=Ti, V, Mo, M'=V, Mo) compounds with a ThMn12-type structure were investigated. Alloy powders of SmFe10V2, SmFe10TiV, and NdFe10MM' (M=Ti, V, Mo…
Silicon carbonitride monoliths derived from polymer powder compacts via polymer pyrolysis represent a new class of structural ceramic materials due to the complete coalescence of the powder particles during polymer decomposition and the formation of a uniform ceramic matrix free from any grain boundaries or secondary…
Abstract The feasibility of combining selective reduction of nitric oxide by ammonia, or nitric oxide oxidation by methanol, with partial flue gas condensation has been studied in the laboratory. It was demonstrated that both combinations may result in high removal efficiencies for nitric oxide and sulfur dioxide. Hig…
Abstract The interaction of poly(ethylene glycol) with some salts of alkali‐earth metals (Mg(ClO 4 ) 2 , BaCl 2 , SrCl 2 , SrBr 2 and CaCl 2 ) in methanolic solutions was investigated by electroconductivity, viscometry, X‐ray diffractometry and NMR. It was established that the conformation of macromolecules is strongl…
Statistical-thermodynamic calculations have been combined with the results of high-temperature Knudsen-effusion studies of the vaporization of Si2Te3 to calculate the thermodynamic properties of SiTe(g) from T→0 to T=2000 K. The dissociation enthalpy D○m(SiTe, T→0) is (448±8) kJ⋅mol−1; its value is discussed vis-a-vis…
Abstract A protoporphyrin IX derivative having a phospholipid residue (lipid-porphyrin) was synthesized. The lipid-porphyrin itself formed an oval multilamellar vesicle in an aqueous medium. The spectral features of the lipid-porphyrin vesicle indicated a stacked configuration of the porphyrin moiety.
Article The crystal structure of wolframite type tungstates at high pressure was published on November 1, 1993 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 207, issue 1-2).
Analysis of net and bottle samples from the southern Gulf of Mexico allowed documentation of the morphological variation exhibited by 201 chains of the planktonic diatom Chaetoceros diversus Cleve. Considerable variation existed in the length (i.e. number of cells) and curvature of chains, dimensions of individual cel…
The texture and microstructure of rolled and annealed pure Ta was investigated by means of quantitative texture analysis and metallography. The rolling textures were discussed using simulations according to Relaxed Constraints Taylor Theory. The annealed samples revealed recovery and continuous recrystallization for w…
Abstract Isotropic and oriented thin films of rigid‐rod, rigid‐rod pseudo‐ladder, and ladder polymers were ion‐bombarded with 84 Kr + to a dose of 4 × 10 16 ions/cm 2 . The bombardment was conducted at two conditions: one at 190 keV energy with 0.12 μA/cm 2 current density and the other at 200 keV energy with 2.0 μA/c…