Materials Literature
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Trace amounts of poly[(R)-3-hydroxybutanoate] were isolated from competent Escherichia coli, spinach, bovine serum albumin, beef heart mitochondria, and aortal tissues, all sources in which it is not accumulated as storage material. Its identity was in all cases proved by 1H-NMR spectroscopy. In some runs, the poly[(R…
A simple procedure was devised for the preparation of a standard KCl powder to be used for the experimental determination of the instrumental profile in the Bragg–Brentano geometry. The standard was tested on several diffractometers, and narrow Bragg reflections in the range 28°–132° were recorded adopting various exp…
Abstract A sepiolite from Vallecas (Spain) was treated with solutions of HC1 (1.25, 2.5, 5.0, 10.0 and 20.0 wt%) at 25°C for 2, 6, 24 and 48 h, respectively. The resulting solids were characterized by XRD, FT-IR and thermal analyses, along with SEM, TEM and nitrogen adsorption isotherms at 77 K. The free silica was di…
Abstract A new model of silica's aggregation in rubber, the Hexagon-linking Model, is proposed and tested in this study, using transmitting, scanning and analytical electron microscopy. When wetted in rubber, silica tends to accumulate, by way of hexagonal rings, differently from carbon black; the “wetted” states can…
Abstract The preparation and isolation in the solid state of five aryl 1,2,3,5‐dithia‐ and diselenadiazolyls is reported. The structure of the dimer of 4‐ClC 6 H 4 CN 2 S 2 in the solid state was obtained: monoclinic, C2/c with Z = 8, a = 20.982(10), b = 10.058(3), c = 15.867(6) Å, β = 93.34(4)°, R = 0.066, R w = 0.…
Single- and three-phase broad-beam x-ray attenuation data have been obtained using lead, steel, plate glass, gypsum wallboard, lead acrylic, and wood. Tube voltages of 50, 70, 100, 125, and 150 kVp were employed and the resulting curves were compared to transmission data found in the literature. To simplify computatio…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation K. Hongladarom, V. Secakusuma, W. R. Burghardt; Relation between molecular orientation and rheolo…
Abstract SBR compounds containing ground vulcanizates of known composition and cure state were prepared and the cure behavior studied. Decreases in scorch times and maximum rheometer torques were observed when ground vulcanizates were added to the SBR compounds. Two primary phenomena are proposed to explain these find…
We report the results of a theoretical study of the interaction between aluminum and poly(p-phenylenevinylene) and derivatives of poly(p-phenylenevinylene). This allows us to investigate the initial stages of formation of the metal/conjugated polymer interface. Applying the semiempirical Austin model 1 method, we find…
The Jiles-Atherton (J-A) model is applied to the problem of describing the dynamics of a nonlinear circuit driven by a square wave voltage source and comprising a linear resistor and capacitor in series with a nonlinear inductor, whose core displays saturation and hysteresis. The presence of hysteresis is shown to inc…
Corrosion behavior of grade 550 (X-80) pipeline steel with coating disbondments was studied in a range of bicarbonate (HCO3−) solutions using a potentiodynamic polarization technique. Corrosion morphology of the steel was examined using optical and scanning electron microscopy. The shape of the polarization curves and…
Genetic engineering offers the potential for creating new proteins with novel materials properties. The aim of this study is to develop strategies for incorporating the non-natural amino acid p-fluorophenylalanine (pfF), which is known to be utilized by the Escherichia coli protein synthesis apparatus, into repetitive…
Migration of a small drop of liquid, initially at rest on a level, solid surface, can be induced by means of thermocapillary forces. If a temperature gradient is imposed across the solid, it has the effect of diminishing the surface tension on the warmer side of the droplet. Consequently, migration manifests itself as…
b 29 Si and 27 Al MAS‐NMR were performed on NaOH‐activated blast‐furnace slag to better characterize the amorphous and poorly crystalline phases which occur in this system. The unreacted glass has a mainly dimeric silicate structure represented by a broad 29 Si peak (FWHM = 15 ppm) centered at –74.5 ppm [ Q 1 ], with…
The conversion of phosphazene high polymers to useful materials depends on the development of methods to cross-link the macromolecular chains. A number of cross-linking routes have been used, including chemical, photochemical, and high energy radiation techniques. The relationship of the cross-linking processes to ele…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA New Synthetic Method of Preparing Iodohydrin and Bromohydrin Derivatives through in situ Generation of Hypohalous Acids from H5IO6 and NaBrO3 in the Presence of NaHSO3Haruyoshi Masuda, Kiyoshi Takase, Masahiro Nishio, Akira Hasegawa, Yutaka Nishiyama, and Yasutaka IshiiCit…
Abstract Pipes of an unstabilized medium‐density polyethylene have been pressure tested with internal stagnant water and moderately circulating air as the external medium at temperatures ranging from 70 to 105°C and changes in molecular structure and crystallinity have been studied. The stage III (fracture induced by…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrototypes for the Polaronic Ferromagnet. Synthesis and Characterization of High-Spin Organic PolymersMichael M. Murray, Piotr Kaszynski, David A. Kaisaki, Wonghil Chang, and Dennis A. DoughertyCite this: J. Am. Chem. Soc. 1994, 116, 18, 8152–8161Publication Date (Print):Sep…
A study is reported of the in situ growth of three distinct phases of LiCoO2 by laser ablation deposition on heated substrates in an oxygen background. Films were characterized by x-ray diffraction from which crystal structure, crystal orientation, lattice constants, and phase information were obtained. Electron micro…
The relative phase shift of light transmitted through a liquid crystal television (LCTV) panel as a function of the applied voltage on the LCTV can be obtained by writing a Ronchi grating pattern to the LCTV and measuring the intensities in the diffraction pattern at the Fourier plane combined with the amplitude modul…