Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompression-molded polyurethane block copolymers. 2. Evaluation of microphase compositionsJeffrey T. Koberstein and Louis M. LeungCite this: Macromolecules 1992, 25, 23, 6205–6213Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
Site-directed mutagenesis was used to examine the catalytic importance of 2 histidine and 4 arginine residues in Escherichia coli periplasmic acid phosphatase (EcAP). The residues that were selected as targets for mutagenesis were those that were also conserved in a number of high molecular weight acid phosphatases fr…
Up to now, the positive lead dioxide active mass (PAM) has been treated as a crystal system. Its behavior, however, could not be fully explained by its crystal nature. In the present paper, a new approach is suggested which views PAM as a gel‐crystal system. Crystal zones are built of and exhibit electron conductivity…
Dynamic light scattering from polymer gels is complicated by the fact that the scattering intensity and its time correlation function change as different parts of a sample are explored. This results from the nonergodicity of the sample---time averages are not the same as ensemble averages, the result of a finite rigid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAb initio study of superalkalis. First ionization potentials and thermodynamic stabilityEva Rehm, Alexander I. Boldyrev, and Paul v R. SchleyerCite this: Inorg. Chem. 1992, 31, 23, 4834–4842Publication Date (Print):November 1, 1992Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPenicillin sensor based on a microarray electrode coated with pH-responsive polypyrroleMatsuhiko. Nishizawa, Tomokazu. Matsue, and Isamu. UchidaCite this: Anal. Chem. 1992, 64, 21, 2642–2644Publication Date (Print):November 1, 1992Publication History Published online1 May 20…
The flame retardant mechanism described for phosphorus- containing flame retardants includes both a condensed and a vapor phase mechanism depending on the type of phosphorus compound and the polymer. Intumescence is also described. Chemical structures of the flame retardant are shown. Specific applications for red pho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure/properties of conjugated conductive polymers. 1. Neutral poly(3-alkythiophene)sShow An Chen and Jui Ming NiCite this: Macromolecules 1992, 25, 23, 6081–6089Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 No…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompression-molded polyurethane block copolymers. 1. Microdomain morphology and thermomechanical propertiesJ. T. Koberstein, A. F. Galambos, and L. M. LeungCite this: Macromolecules 1992, 25, 23, 6195–6204Publication Date (Print):November 1, 1992Publication History Published…
Calorimetric measurements of the glass transition are presented for metallic glasses, ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$, and organic polymers with cooling and heating rates ranging over more than three orders of magnitude. Fits of the onset temperatures of the glass transition to a Vogel-Fulcher-type equation give…
Semiconductor films with small crystal size normally exhibit prohibitively large recombination losses in photovoltaic cells. We show that porous nanocrystalline films of CdS and CdSe can be used as photoelectrodes in photoelectrochemical cells with relatively low recombination losses. Spectral response measurements sh…
We have performed extensive self-consistent total energy calculations for PbTiO3 and BaTiO3 in order to better understand the origin of the ferroelectric instability in perovskites and the reasons for different ferroelectric behavior in the two materials. Physically reasonable ferroelectric instabilities are found for…
The kinetics of the L-lactide bulk polymerization was studied using tin(II) bis(2-ethylhexanoate) and zinc bis(2,2-dimethyl-3,5-heptanedionato-O,O'). Up to 80% conversion, the rate of polymerization using tin(II) bis(2-ethylhexanoate) is higher than that with the zinc-containing catalyst, while at conversions beyond 8…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAll-solid-state sodium-selective electrode based on a calixarene ionophore in a poly(vinyl chloride) membrane with a polypyrrole solid contactAodhmar. Cadogan, Zhiqiang. Gao, Andrzej. Lewenstam, Ari. Ivaska, and Dermot. DiamondCite this: Anal. Chem. 1992, 64, 21, 2496–2501Pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe selective functionalization of saturated hydrocarbons: Gif chemistryDerek H. R. Barton and Dario DollerCite this: Acc. Chem. Res. 1992, 25, 11, 504–512Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(ethylene oxide)-silicate intercalation materialsPilar Aranda and Eduardo Ruiz-HitzkyCite this: Chem. Mater. 1992, 4, 6, 1395–1403Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs.acs.org/…
Contrary to common textbook statements, the macroscopic electric polarization of a crystal cannot be unambiguously defined as the dipole of a unit cell. The only measurable quantities are either derivatives of the polarization (dielectric susceptibility, Born effective charges, piezoelectricity, pyroelectricity) or fi…
The development of recording media based on molecular spin‐transition (ST) materials is discussed and applications demonstrated for the first time. The figure shows a compound which exhibits an ST and which is based on Fe II and 1,2,4‐triazole units. The central Fe II ion undergoes an ST at around 210 K which is accom…
Description of the spectrometer x-ray source monochromator electron lens hemispherical analyser multichannel detector sample analysis chamber charge compensation performance on conducting samples performance on insulating samples performance on testing of the spectrometer experimental protocol sample mounting data acq…
Elastic scattering of polarized electrons from unpolarized Hg, Tl, and Pb atoms has been studied at energies ranging from 0.3 to 2.0 eV and scattering angles ranging from 30' to 125'. The experimental data of the Sherman function S are compared with two calculations in which the target configuration is accounted for i…