Materials Literature
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Abstract The polymerization of propylene oxide (PO) was studied with an initiator prepared by the reaction of ( R )‐(−)‐3,3‐dimethyl‐1,2‐butanediol ( 1 ) with aluminium hydride. When mixed with zinc chloride in a 1:1 mole ratio, the initiator was found to be highly reactive and also stereoelective in the polymerizatio…
Effect of uniformity on the resistivity was investigated for SiC‐ZrB 2 ceramic composites. Dispersion of ZrB 2 particles was numerically characterized by image analysis. Spatial fluctuation of composition greatly affected the resistivity of composites. The effective medium theory was extended to treat composites with…
Light and electron microscope observations have been made of Opephora olsenii collected from brackish water sites mainly on the Swedish west coast, where it is one of the dominant species in the epipsammic microflora. O.olsenii differs from other taxa allocated to Opephora in having interlocking spines originating fro…
Abstract Aiming to prove that commercial, 50°CPVC consists of a dual population of chains, has led us to the investigation of the thermal stability of low conversion (0,1–2%) PVC. Bulk polymers prepared at very low conversion levels were shown to be different to high conversion material. The former are more syndiotact…
Galvanized substrate morphology, oxide layer chemistry, bond failure modes, failure loci, and bondline corrosion have been investigated for adhesive bonds to galvanized steel. Significant differences in surface morphology were observed between the relatively smooth surfaces of “hot-dipped” substrates and the considera…
The inception voltage Vi for 1 pC partial discharges has been measured for vacuum molded needle-plane samples of low density polyethylene. The principal parameters studied are needle radius R (3≦R≦100 μm), ambient gas (air, N2, Ar, SF6), and frequency of the applied ac Voltage (60 Hz, 1 kHz). Experimental results duri…
Photosensitive polyimides have been investigated as substitutes for a standard aqueous base-etchable polyimide. The application uses a ceramic base module on which two layers of metal circuits are separated by a polyimide dielectric. Using a photosensitive polyimide reduces the number of steps and shortens the process…
Abstract The temperature dependence of 35 Cl NQR frequencies of [(CH 3 ) 2 NH 2 ] 2 SnCl 6 was precisely determined between 78 and ca. 250 K. by means of an FT NQR spectrometer. The high‐frequency line of the two 35 Cl NQR signals having the intensity ratio of 2:1 already reported was observed to be split below 102 K.…
Several 13.2 kV, 21,000 HP synchronous motors failed as a result of interturn insulation breakdown. Investigation of motor failures indicated that the cause was related to high magnitude, steep fronted surge waves (References 1 and 2). Partial discharge (corona) related failures were discounted without any actual meas…
The pressure dependence of the Raman-active vibrational modes in ${\mathrm{TlReO}}_{4}$ has been investigated up to 16 GPa, using the diamond-anvil cell. The abrupt changes in the Raman spectra indicate that three pressure-induced phase transitions occur at 0.5, 1.9, and 9.7 GPa. The first two transitions are not acco…
Abstract An experimental study of agglomeration tendency and the compounding of calcium carbonates of varying particle size into polypropylene and polystyrene melts in an internal mixer and in a two roll mill is described. The tendency of particles to agglomerate was studied using the sedimentation volume method. Aggl…
It is imperative that operating personnel and regulatory agencies have secure, advance, and accurate knowledge of the true surface properties of materials to be contacted with flowing blood. The actual devices must be characterized in their sterile, immediate pre-exposure states. Although very sensitive electronic ins…
We study experimentally the patterns behind a moving cholesteric--smectic-A interface. There are three interface types, each of which corresponds to one of the three basic topologically possible configurations.
The amplification of light signals by the mechanism of stimulated Raman scattering is discussed, with specific reference to certain heavy-metal germanate and arsenate glasses with Raman-gain-coefficients G of up to 20 times that of fused silica. Calculations are presented of the intrinsic scattering losses from Raylei…
Proteins may be rigid or flexible to various degrees as required for optimum function. Flexibility at the level of amino acid side-chains occurs universally and is important for binding and catalysis. Flexibility of large parts of a protein which rearrange or move are particularly interesting and will be discussed her…
Abstract The effect of varying interaction parameters on the phase diagrams of ternary polymer blends was explored by simulating spinodals through use of the Flory‐Huggins lattice theory. Results indicate that miscibility is favored for the case of ternary mixtures of marginally miscible or marginally immiscible pairs…
Abstract The crystal structures of oxidized and photoreduced decatungstates are compared. Three specimens of decatungstate complexes were prepared in mixed solvents of H2O–CH3CN and were characterized by X-ray diffraction. Unit cell parameters are as follows: (C6H16N)4[W10O32]·2CH3CN; DECA Mr=2841.4, monoclinic, P21⁄n…
Abstract The Powder Diffraction File (PDF) is a collection of single phase X-ray powder patterns, maintained and distributed by the JCPDS-International Centre for Diffraction Data. Over the past 10 years there has been increasing use of the PDF in computer readable form, but the limited amount of disk space available…
A model for protein adsorption kinetics has been presented. This model includes diffusion-limited adsorption, adsorption and desorption rate constants kon and koff, which are dependent on the surface concentration, and an interaction term for the mutual influence of the adsorbed protein molecules. It has been shown th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, electrochemistry, and ligand-addition reactions of gallium(III) porphyrinsK. M. Kadish, J. L. Cornillon, A. Coutsolelos, and R. GuilardCite this: Inorg. Chem. 1987, 26, 25, 4167–4173Publication Date (Print):December 1, 1987Publication History Published online1 May…