Materials Literature
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Linear very high molecular weight polyamides, such as nylons 6, 7 and 66, have been prepared via the rapid ring-opening polymerization (ROP) of their respective lactams catalyzed by super nonionic poly(aminophosphazene) and protophosphatrane bases. The super nonionic poly(aminophosphazene) bases appear to mimic cataly…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorThermotropic and Lyotropic Mesophase Behavior of Some Novel Phthalocyanine-Centered Poly(oxyethylene)sGuy J. Clarkson, Bashir M. Hassan, Darren R. Maloney, and Neil B. McKeownView Author Information Department of Chemistry, University o…
A new mixed valence copper complex Cu(II)(Me(5)dien)Cl(2)(Cu(I)Cl) (2) was obtained from the reaction of CuCl with Cu(II)(Me(5)dien)Cl(2) (1) in acetonitrile. The structures of 1 and 2 have been determined by single-crystal X-ray diffraction analyses. Compound 1 crystallizes in the monoclinic space group P2(1)/n with…
This study examines the structure of planar polyelectrolyte brushes and the disjoining pressure between such brushes in a poor solvent. The self-consistent field theory is used in this work in contrast with the earlier studies that used a step-density model. We predict that upon the reduction in solvent quality the br…
This study analyzes computer models of the microporous material imogolite. The purpose of this work is to validate computational methods developed for extracting pore size, pore volume, and surface area measurement of molecular level computer models. We accomplished this by comparing model properties with experimental…
Interest continues to be high in the effects of irradiation on the microstructure and microchemistry of Zircaloy and on the resultant effects on performance of Zircaloy components in-reactor. In this study, we have investigated the behavior of material prepared to have excellent resistance to nodular corrosion in a BW…
This chapter discusses the anomalous yield behavior of compounds with L12 structure. It is generally accepted that the anomalous increase of the yield and flow stresses with increasing temperature, observed in a number of L12 intermetallic compounds, is related to the thermally assisted immobilization of super disloca…
The authors present Monte Carlo (MC) simulation results for the intensity and angular distribution of scattered radiation from cylindrical absorbers. For coherent scattering they have taken into account the effects of interference by using new molecular form factor data for the AAPM plastic materials and water. The fo…
We present analytical expressions for the frequency response of avalanche photodetectors (APDs) with separate absorption and multiplication regions (SAM). The effect of the electric field profile in the multiplication layer on frequency response is considered for the first time. Previous theories have assumed that the…
Abstract
The angiogenic agent erucamide (cis-13-docosenamide), incorporated into a polymeric biomaterial (Elvax 40P, a copolymer of ethylene and vinyl acetate), was used to determine whether angiogenesis can be increased in the regenerating skeletal muscle, and whether the enhanced revascularization improves the new muscle for…
The time-resolved emission spectra and lifetimes of a series of lanthanide acylpyrazolones complexes were measured under 266 nm laser excitation. The phosphorescence spectra of the triplet states of the Gd(III) complexes were observed at room temperature. The relative efficiencies of intramolecular energy transfer fro…
This paper presents a neural network model for predicting the yarn irregularity, based on inputs of fiber property measurements with the AFIS instrument. By using a back-propagation neural network algorithm, alternative models were fitted and compared. The resulting predictions of yarn irregularity are superior to the…
The crystallization of InSe from bulk amorphous indium−selenium alloys was studied as a function of composition. The composition dependence of the nucleation energy of InSe from amorphous alloys was determined using a Kissinger analysis of differential scanning calorimetry data. A minimum in the nucleation energy was…
Mg-Al layered double hydroxides have been synthesized and 1,5-naphthalene disulfonate dianions have been intercalated; the organic molecules were carbonized within the layered framework. For comparison, a reference carbon was prepared from the sodium salt of the 1,5-naphthalene disulfonic acid precursor using conventi…
The thermoreversible gelation of agarose has been investigated in four different aqueous binary solvents: water/dimethyl sulfoxide, water/ N, N -dimethylformamide, water/ N -methylformamide, and water/formamide. The thermal behavior through the gelation/melting temperatures and the gelation/melting enthalpies has been…
A model system of short polystyrene−polyisoprene diblock copolymers mixed with the corresponding strongly segregated long diblock copolymers is studied by small-angle X-ray scattering, electron microscopy, and self-consistent mean-field calculations of the ordered microphases. It is found that most of the small dibloc…
In-situ extended X-ray absorption fine structure (EXAFS), 1 H and Xe nuclear magnetic resonance (NMR), H 2 chemisorption, X-ray powder diffraction (XPD), and high-resolution electron microscopy (HREM) techniques were used to understand, as precisely as possible, carefully prepared Pt/Y zeolite samples at industrially…
A direct relationship between a generalized Fukui function and charge redistribution between states of different multiplicities is exploited to rationalize the stability of half-filled shells. This rationalization is in agreement with the idea introduced by Boyd (Boyd, R. J. Nature 1984, 310, 480) that Hund's rule is…
New segmented polyurethanes (SPUs) based on stearyl and phosphatidylcholine analogues were synthesized. The soft segments used in this study were the poly(butadiene) (PBD) glycol, the hard segments of these SPUs were composed of 4,4‘-methylenediphenyl diisocyanate (MDI), 2-[bis(2-hydroxyethyl)methylammonio]ethyl stear…