Materials Literature
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Polyurethanes offer the greatest versatility in compositions and properties of any family of polymers. For implantable medical devices, a few specific elastomeric polyurethane compositions have demonstrated a combination of toughness, durability, biocompatibility and biostability not achieved by any other available ma…
Continuing efforts in vascular prosthetic design are focused on understanding the characteristics required for function of small internal diameter and low-flow prostheses. The pioneers of vascular surgery developed large diameter textile prostheses for successful reconstruction of the aortoiliac vessels, but fabric gr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe formation, characterization, and reactivity of the oxene adduct of [tetrakis(2,6-dichlorophenyl)porphinato]iron(III) perchlorate in acetonitrile. Model for the reactive intermediate of cytochrome P-450Hiroshi. Sugimoto, Hui Chan. Tung, and Donald T. SawyerCite this: J. A…
Abstract The present paper introduces a new fundamental approach to the modeling of diffusion‐controlled free‐radical polymerization reactions. Our analysis follows the original work of Chiu, Carratt, and Soong (CCS), according to which the termination and propagation rate constants are expressed in terms of both a pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA convenient synthesis of alkali metal selenides and diselenides in tetrahydrofuran and the reactivity differences exhibited by these salts toward organic bromides. Effect of ultrasoundDennis P. Thompson and Philip BoudjoukCite this: J. Org. Chem. 1988, 53, 9, 2109–2112Publi…
In recent theoretical work we have shown that the sintering of a composite is strongly affected by the shear deformation of the continuous phase. This phenomenon was studied experimentally in a model system consisting of a TiO 2 matrix dispersed with nondensifying agglomerates of Al 2 O 3 . The results of this study a…
An explicit expression for the sedimentation velocity at low particle Reynolds number in a concentrated suspension is derived and evaluated for two different approximations to the hydrodynamic interactions: a strict pairwise additive approximation and a far-field, or Rotne–Prager, approximation. It is shown that the s…
The ultrastructure and biochemical composition of cytoplasmic particles that form in chicken embryo fibroblasts during stress have been analyzed. We showed previously that these particles contained the small stress protein, sp 24, and antibodies specific to sp 24 were used here to identify the stress granule. In thin…
Synopsis A rapid method has been developed in order to compare the photostability of several sunscreen agents incorporated in the same type of emulsion. Thin films of the different preparations were spread on quartz plates and irradiated with a solar simulator. Differences in energy distribution according to wavelengt…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation of thin polymeric films on electrode surfaces by electropolymerization of o-aminophenolSatoshi Kunimura, Takeo Ohsaka, and Noboru OyamaCite this: Macromolecules 1988, 21, 4, 894–900Publication Date (Print):April 1, 1988Publication History Published online1 May 20…
Abstract The crystal structure of polythiophene is analyzed by the Rietveld whole‐fitting method on the X‐ray diffraction powder profile. Experimental data allow only a bidimensional characterization of the structure in the plane orthogonal to the chain axis with a pgg symmetry ( a = 7,79; b = 5,53 Å). Best fitting is…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOn the crosslinking mechanism of benzophenone-containing polyimidesAnshyang A. Lin, Vinod R. Sastri, Giuliana Tesoro, Arnost Reiser, and Raymond EachusCite this: Macromolecules 1988, 21, 4, 1165–1169Publication Date (Print):April 1, 1988Publication History Published online1…
Dynamic light scattering and photon correlation spectroscopy are able to resolve large ranges of coherence times, and hence of scattering particle size or constant of diffusion, in a single measurement if a modern multiple-tau correlator is used. However, particular problems like bias and unsatisfactory statistical ac…
A new principle for analyzing the kinetic energy as well as the angular distribution of charged particles has been discovered. A new display type analyzer was constructed according to theory. It consists of an inner hemispherical grid and an outer hemispherical electrode which has a radius two times larger than that o…
High-resolution synchrotron-radiation powder data for quartz and Mg2GeO4, an olivine homologue, were obtained with a 365 mm long parallel-slit collimator with 0.05° aperture. The crystal structures were refined using a pseudo-Voigt profile fitting function and POWLS. Fourier maps were calculated from the measured stru…
The transfer function of a transformer winding is deconvoluted in the frequency domain from the digitally recorded neutral current and high voltage applied during impulse tests. The integrity of the winding insulation is determined by comparing the transfer function obtained at full and reduced test voltage. Differenc…
Results are presented for the measured single‐crystal elastic constants of yttria‐stabilized zirconia, for yttria contents of 1.7 to 20 mol%. The results cover a range of materials which vary from a mixture of monoclinic, tetragonal, and cubic to those which are fully cubic. These single‐crystal measurements are used…
The kinetics of molecular-beam epitaxy are examined by means of Monte Carlo simulations in combination with a new approach for monitoring surface growth, i.e., by calculating the evolution of the surface step density. The evolution of the step density is shown to have a remarkable correspondence to that of the measure…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWet oxidation catalyzed by ruthenium supported on cerium(IV) oxidesSeiichiro Imamura, Ikumi Fukuda, and Shingo IshidaCite this: Ind. Eng. Chem. Res. 1988, 27, 4, 718–721Publication Date (Print):April 1, 1988Publication History Published online1 May 2002Published inissue 1 Ap…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemical reactions of imidazole with metallic silver studied by the use of SERS and XPS techniquesGi. Xue, Quinpin. Dai, and Shuangen. JiangCite this: J. Am. Chem. Soc. 1988, 110, 8, 2393–2395Publication Date (Print):April 1, 1988Publication History Published online1 May 200…