Materials Literature
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A nonequilibrium structure consisting of fine quasicrystalline (icosahedral) grains surrounded by fcc-Al phase was found to form in rapidly solidified Al–Mn–Ce alloys. The formation of the nonequilibrium structure is limited to a composition range of 4 to 6 at% Mn and 2 to 3%Ce which is located around the phase bounda…
A novel class of macromonomer, in which the macromolecular part is a hyperbranched dendritic polyether prepared by the ‘convergent-growth’ approach, is synthesized and characterized. Free-radical copolymerization with styrene at various feed ratios gives a series of unique copolymers.
In general investigation of factional properties of fabrics, we demonstrate the influence of experimental variables on some new frictional parameters. Subjectively, fabrics with similar (or different) coefficients of friction yield different (or similar) tactile sensations of smoothness. Objectively, an examination of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on poly(o-methoxyaniline)Mool C. Gupta and Suresh S. UmareCite this: Macromolecules 1992, 25, 1, 138–142Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10.1021/ma00027a023h…
Stable colloidal dispersions of silver were prepared by ultrasonic irradiations of aqueous AgClO4 or AgNO3 solutions in the presence of surfactants.
The electromagnetic interference shielding effectiveness and return loss of short carbon-filled polychloroprene rubber composites of varying sample thickness and fiber aspect ratio were studied in the frequency range of 8 to 12 GHz (X-band). It was observed that composites prepared by the cement-mixed method with high…
Abstract Urea, various glycols and mixtures of these were tested as plasticizers for gelatinized cornstarch. Mixtures of cornstarch, urea and/or triethylene glycol, glycerol or propylene glycol were extruded into ribbons. Mechanical and structural properties of the ribbons were evaluated by tensile testing, DSC and NM…
The gradual shift from biostable prostheses to degradable, temporary implants represents one of the most significant trends in biomaterials research. In view of this trend, medical applications of degradable implant materials were reviewed with special emphasis on orthopedic polymeric implants. Among the polymeric imp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and properties of polyoxometalates based inorganic-organic polymersP. JudeinsteinCite this: Chem. Mater. 1992, 4, 1, 4–7Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January 1992https://pubs.acs.org/doi/10…
We have designed and built an imaging filter which can be attached to most stan- dard TEMs, and is capable of operating at primary energies of up to 400 keV. The filter uses a 90m agnetic sector prism, a piezoelectrically controlled energy-selecting slit, and 6 quadrupole and 5 sextupole lenses. It fully corrects seco…
The structure of mullite was refined by the Rietveld method, and a new method for the estimation of chemical composition of mullite was proposed. Mullites were synthesized by firing the starting materials prepared by sol–gel and spray pyrolysis methods at various temperatures. Linear correlations were recongnized betw…
Abstract Physical properties of blown films (25‐60‐μm thickness) from compounded mixtures of linear low‐density polyethylene (LLDPE) and starch were investigated. As starch content increased, tensile strength, percent elongation, and light transmittance decreased and film thickness increased. Among the tested films, s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe ordered bicontinuous double-diamond morphology in diblock copolymer/homopolymer blendsKaren I. Winey, Edwin L. Thomas, and Lewis J. FettersCite this: Macromolecules 1992, 25, 1, 422–428Publication Date (Print):January 1, 1992Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSilicon carbonitride from polymeric precursors: thermal cross-linking and pyrolysis of oligosilazane model compoundsN. S. Choong Kwet Yive, R. J. P. Corriu, D. Leclercq, P. H. Mutin, and A. ViouxCite this: Chem. Mater. 1992, 4, 1, 141–146Publication Date (Print):January 1, 1…
A detailed study of protonic conductivity in Nd-doped BaCeO3 is made using water-uptake and galvanic-cell measurements to supplement the conductivity results. Samples were pretreated at 900°C at different PH2O atmospheres and the conductivity measured with a frozen-in proton concentration. Isotope effect (D2O versus H…
The phase evolution, under thermal treatment, of the 12-molybdo(tungsto)phosphoric acids and their related 1-vanado-substituted compounds has been studied by in situ X-ray diffraction methods. The anhydrous acid temperature range is clearly observed for the 12-molybdo(tungsto)phosphoric acid parents via formation of a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic modeling of epoxy-amine kinetics. 1. Model compound studyJovan Mijovic, Arnon Fishbain, and Jony WijayaCite this: Macromolecules 1992, 25, 2, 979–985Publication Date (Print):January 1, 1992Publication History Published online1 May 2002Published inissue 1 January…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotocatalytic oxidation of organic compounds by polyoxometalates of molybdenum and tungsten. Catalyst regeneration by dioxygenA. Hiskia and E. PapaconstantinouCite this: Inorg. Chem. 1992, 31, 2, 163–167Publication Date (Print):January 1, 1992Publication History Published o…
Nanocrystalline (nc) metals show significant differences in their thermodynamic properties, such as specific heat at constant pressure and thermal expansion, in comparison to polycrystalline metals. These properties are explained in terms of a macroscopic analysis. Based on a quasiharmonic approximation, the thermodyn…
Properties of synchrotron radiation optical elements of a diffraction beamline synchrotron data measurement accuracy and the mapping of charge densities with synchrotron radiation anomalous scattering time resolved studies and the response of crystals to external perturbations multi-wavelength methods high resolution…