Materials Literature
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Abstract A new telechelic polyisobutylene diol, HOCH 2 PIBCH 2 OH, carrying two terminal primary hydroxyl end groups has been prepared from α,ω‐di(isobutenyl)polyisobutylene, CH 2 C(CH 3 )‐ CH 2 PIBCH 2 C(CH 3 )CH 2 , by regioselective hydroboration followed by alkaline hydrogen peroxide oxidation. Infrared (I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRuthenium(II) tris(bipyrazyl) dication - a new photocatalystR. J. Crutchley and A. B. P. LeverCite this: J. Am. Chem. Soc. 1980, 102, 23, 7128–7129Publication Date (Print):November 5, 1980Publication History Published online1 May 2002Published inissue 5 November 1980https://…
Electron-spin-resonance spectra have been obtained at 9.1 and 35 GHz for ${E}^{\ensuremath{'}}$ centers induced by $\ensuremath{\gamma}$ irradiation in a number of high-purity commercial fused silicas and in a suite of glassy Si${\mathrm{O}}_{2}$ samples of varying degrees of enrichment (or depletion) in the magnetic…
We calculate the contribution to elastic photon scattering from an atom due to scattering off the bound atomic electrons (Rayleigh scattering). We compare predictions resulting from our numerical evaluation of the relativistic second-order $S$ matrix in a screened central potential with other theories, particularly th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeterogeneous photocatalytic oxidation of hydrocarbons on platinized titanium dioxide powdersIkuichiro Izumi, Wendell W. Dunn, Keith O. Wilbourn, Fu-Ren F. Fan, and Allen J. BardCite this: J. Phys. Chem. 1980, 84, 24, 3207–3210Publication Date (Print):November 1, 1980Publica…
Abstract In 1955 Natta and his co‐workers from the Istituto di Chimica Industriale del Politecnico di Milano reported the properties of highly crystalline polypropylene and other poly‐α‐olefins [1] which posses, at least in long sections of the main chain, asymmetric carbon atoms of the same absolute configuration (is…
An investigation of the effects of changing heating times during the draw-texturing of nylon 6.6 is reported. As the heating time was reduced, the values of the crimp rigidity of the yarns also decreased. From an analysis of these results, relative values of the rates of setting of partly oriented nylon 6.6 yarns can…
Calcofluor White ST, stilbene derivative used commerically as an optical brightener for cellulose, increased the rate of glucose polymerization into cellulose by resting cells of the gram-negative bacterium Acetobacter xylinum. This bacterium normally produces a ribbon of cellulose that is a composite of crystalline m…
Significant quantitative differences in end-product yields by two strains of Clostridium thermocellum and one strain of Thermoanaerobium brockii were observed during cellobiose fermentation. Most notably, the ethanol/H(2) and lactate/acetate ratios were drastically higher for T. brockii as compared with C. thermocellu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDomain-Boundary Structure of Styrene-Isoprene Block Copolymer Films Cast from Solutions. 5. Molecular-Weight Dependence of Spherical MicrodomainsTakeji Hashimoto, Mineo Fujimura, and Hiromichi KawaiCite this: Macromolecules 1980, 13, 6, 1660–1669Publication Date (Print):Nove…
Glutaraldehyde is commonly used to control physical and biological properties of collagen structure by means of intramolecular and/or intermolecular crosslinking of collagen molecules. Solubility, antigenicity, and biodegradation of naturally occurring or reconstituted collagenous matrices are effectively reduced by g…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of Microphase Separation in Block CopolymersLudwik LeiblerCite this: Macromolecules 1980, 13, 6, 1602–1617Publication Date (Print):November 1, 1980Publication History Published online1 May 2002Published inissue 1 November 1980https://pubs.acs.org/doi/10.1021/ma60078a0…
Abstract Transmission electron microscopy has been used to study the microstructural features associated with void swelling resistance in FV448 martensitic stainless steel after fast reactor irradiation to damage levels of 30 dpa at temperatures in the range 380-460 °C. A characteristic feature of the microstructures…
The authors have used molecular dynamics simulation to study the central peak recently discovered by quasi-elastic neutron scattering on SrCl 2 in the fast ion conducting state. They find that the peak appears as a component of the simulated partial dynamical structure factors. They find, in agreement with experiment,…
Inelastic neutron scattering has been used to measure the phonon dispersion relation along (001), (110) and (111) directions of a single crystal of Na<sub>2</sub>S at 50K. A simple shell model has been successfully fitted to the data. Dynamic quantities such as density of states, Debye temperature, displacement-displa…
Phonons in the quasi-one-dimensional compounds ZrS 3 , ZrSe 3 , ZrTe 3 and HfSe 3 have been investigated by Raman spectroscopy. Most of the structures observed have been assigned to Raman active zone centre phonons. Although twelve such k=0 optical phonons are theoretically predicted, some of them are still missing; p…
A review is given of experimental and theoretical work in the last few years which yields information about states in the gap in non-crystalline semiconductors. The discussion is limited to hydrogenated amorphous silicon (a-Si-H) and to the chalcogenides including selenium. Among issues treated are: the evidence for a…
A technique for directly measuring the static structure factor for electrons with use of synchrotron radiation is described. Results for the conduction electrons in beryllium and the basal plane of graphite show a peak at $k\ensuremath{\cong}2{k}_{\mathrm{F}}$ as predicted, but the pair correlation function shows an a…
The force transmitted through the layers of smectic-$A$ and smectic-$B$ phases of butyloxy-benzylidene-octylanine (4O.8) have been measured at frequencies between 1 and 10 000 Hz, in the presence of an ac shear parallel to the layers. It is found that the smectic-$A$ behaves as a viscous fluid. The smectic-$B$ shows a…
Reported here are polarocaloric (electrocaloric) measurements of a ceramic specimen of lead zirconate modified with ${\mathrm{Ti}}^{4+}$ and ${\mathrm{Sn}}^{4+}$. Temperature changes as large as 2.0 \ifmmode^\circ\else\textdegree\fi{}K were recorded. The temperature change varies roughly as the square of the polarizat…