Materials Literature
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Abstract The pyrolytic processes of polycarbosilane (PCS) to silicon carbide and of polycarbosilazane (PCSZ) to silicon carbonitride were studied by gas analysis, electron spin resonance (ESR), and X-ray diffraction. On the progress of conversion from organic polymers to ceramics above 800 K, decomposition gases like…
The dehydration behavior of an analcime formed by ion exchange from leucite (X-type analcime, or secondary analcime) is contrasted with the behavior of an analcime formed by hydrothermal recrystallization from structurally dissimilar materials (hydrothermal analcime, or H-type analcime). The kinetics of dehydration of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIncorporation of Isoprene in Isobutylene/Isoprene Copolymers: NMR Identification of Branching in Butyl RubberJeffery L. White, Tim D. Shaffer, Charles J. Ruff, and John P. CrossCite this: Macromolecules 1995, 28, 9, 3290–3300Publication Date (Print):April 1, 1995Publication…
Use of low‐quality fuels in gas turbines can lead to vana‐dium hot corrosion of stabilized‐zirconia turbine blade coatings. The stabilizing oxide reacts with V 2 O 5 in the melt, forming a vanadate, thus removing the stabilizer from the zirconia. To better understand the vanadation reaction of one such oxide, CeO 2 ,…
Abstract The interaction of chlorine with the hydrogenated diamond surface has been investigated by diffuse reflectance Fourier‐transform Infrared (FTIR) spectroscopy, temperature‐programmed desorption (TPD) spectroscopy, and X‐ray photoelectron spectroscopy (XPS). The hydrogenated diamond surface is chlorinated by th…
Homopolymers of β-butyrolactone, L-lactide, δ-valerolactone, and methyl methacrylate, as well as their block copolymers, were prepared with simple initiator systems based on alkali metal alkoxides and alkali metal supramolecular complexes. The goal was to synthesize polymeric materials with potential biodegradability.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNMR Study of Poly(ethylene oxide) Complexes with LiCF3SO3M. E. Ries, M. G. Brereton, J. M. Cruickshank, P. G. Klein, and I. M. WardCite this: Macromolecules 1995, 28, 9, 3282–3289Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCosolvent Effects on Thermally-Induced Transitions of a Block Copolymer: Poly(ethylene oxide)-Poly(propylene oxide) in Aqueous SolutionsYudu Cheng and Carmel JolicoeurCite this: Macromolecules 1995, 28, 8, 2665–2672Publication Date (Print):April 1, 1995Publication History Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProduction of Oxaporphyrin and Biliverdin Derivatives by Coupled Oxidation of Cobalt(II) OctaethylporphyrinAlan L. Balch, Marinella Mazzanti, Tamara N. St. Claire, and Marilyn M. OlmsteadCite this: Inorg. Chem. 1995, 34, 8, 2194–2200Publication Date (Print):April 1, 1995Publ…
Abstract The effect of synthesis conditions on the electrical conductivity and the morphology of a chemically oxidized polypyrrole was investigated. It was found that the electrical conductivity of polypyrrole was strongly dependent on the pyrrole/FeCl 3 ratio, which controls the redox potential of the reaction medium…
The temperature dependence of the deuteron NMR line shape was studied in pentylcyanobiphenyl (5CB) and octylcyanobiphenyl (8CB) liquid crystals confined in porous silica aerogel matrices with two different pore size distributions. The average pore sizes 〈${\mathit{R}}_{\mathit{c}}$〉 of the two aerogel matrices were 0.…
A notation is introduced and used to transform a conventional specification of the non-bonded force and virial algorithm in the case of periodic boundary conditions into an alternative specification. The implementation of the transformed specification is simpler and typically a factor of 1.5 faster than a conventional…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational Control of Intramolecular Hydrogen Bonding in Heme Models: Maximal CoII-O2 Binding in a C-Clamp PorphyrinC. K. Chang, Ying Liang, Gladys Aviles, and Shie-Ming PengCite this: J. Am. Chem. Soc. 1995, 117, 14, 4191–4192Publication Date (Print):April 1, 1995Public…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRaman Spectra of Poly(2,3-R,R-thieno[3,4-b]pyrazine). A New Low-Band-Gap PolymerJ. Kastner, H. Kuzmany, D. Vegh, M. Landl, L. Cuff, and M. KerteszCite this: Macromolecules 1995, 28, 8, 2922–2929Publication Date (Print):April 1, 1995Publication History Published online1 May 2…
Polyoxometalates have been shown to inhibit the replication of retro-, toga-, paramyxo- and herpesviruses. The primary mechanism of the anti-human immunodeficiency virus type 1 (HIV-1) action of polyoxometalates seems to be inhibition of binding of virus to cells and inhibition of syncytium formation. Since myxoviruse…
The fracture toughness of 3 mol% Y 2 O 3 ‐ZrO 2 (3Y‐PSZ) composites containing 10–30 vol% Al 2 O 3 with different particle sizes was investigated. It was found that Al 2 O 3 dispersion of up to 30 vol% increased the fracture toughness by 17% to 30%, and the toughness increase was more remarkable in the composite dispe…
A new method of area-detector peak integration based on the statistical analysis of pixel intensities is described. The presence of the peak in the integration box causes the skewness of the pixel intensity distribution to increase compared to the skewness of the noise distribution. After the pixel intensities have be…
A detailed analysis of the dynamic properties of liquid lithium at three distinct thermodynamic points has been performed by computer simulation. The reliability of the adopted potential model is supported by a comparison with neutron- and x-ray scattering data. Several dynamical properties (both single-particle and c…
Abstract A modified acetone process for the preparation of aqueous polyurethane (PU) dispersion is investigated. PU dispersions were prepared by polyaddition of isophorone diisocyanate (IPDI) to poly(tetramethylene ether glycol) (PTMG) and dimethylolpropionic acid (DMPA), followed by neutralization of pendant COOH gro…
The electronic density of states, eigenstates, length dependence, and Fermi-energy dependence of the dc conductance in the two-dimensional Penrose lattice are calculated by using an exact diagonalization, Landauer formula and the forced oscillator method in finite size, zero-temperature systems with and without random…