Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of aromatic poly(ether ketones)Mitsuru Ueda and Masaki SatoCite this: Macromolecules 1987, 20, 11, 2675–2678Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://pubs.acs.org/doi/10.1021/ma00…
A series of PEO/PLA copolymers, covering a wide range of compositions and segmental lengths, was synthesized, and their morphology was investigated by means of DSC and IR studies. For matrices comprising PEO chains with molecular weights below 3400, no soft-segment crystallinity was detected. When long hard segments w…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of an oxoruthenium(IV) porphyrin complexJohn T. Groves and Kwang Hyun AhnCite this: Inorg. Chem. 1987, 26, 23, 3831–3833Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://pubs.acs.o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteractions of diatomic molecules with graphiteMary J. Bojan and William A. SteeleCite this: Langmuir 1987, 3, 6, 1123–1127Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1 November 1987https://pubs.acs.org/doi/10.102…
We have measured the photoelectron spectrum of Si−2 and find that the molecular electron affinity is EA(Si2)=2.199±0.012 eV. This spectrum apparently involves multiple electronic states of the Si−2 ion as well as several electronic states of the final neutral, Si2. In order to unravel our experimental findings, we hav…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structures of bis(5,6-dihydro-1,4-dithiin-2,3-dithiolato)gold and tetrabutylammonium bis(5,6-dihydro-1,4-dithiin-2,3-dithiolato)nickelate(1-) and the ligandlike character of the isoelectronic radicals [Au(DDDT)2]0 and [Ni(DDDT)2]-Arthur J. Schultz, Hau H. Wang, Lynda…
The second-harmonic generation efficiencies of a large number of aromatic organic compounds are presented. The second-harmonic data from a series of benzophenone and pyridine derivatives are discussed in detail. Specifically, 4-aminobenzophenone and 4-benzoylpyridine are shown to be of potential interest as frequency…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of paramagnetic and diamagnetic transition-metal monosubstitutions on tungsten-183 and phosphorus-31 NMR spectra for Keggin and Wells-Dawson heteropolytungstate derivatives. Correlations and corrections. Tungsten-183 NMR two-dimensional INADEQUATE studies of .alpha.-…
High-resolution vibrational electron-energy-loss spectra of amorphous ice films condensed at 14 K are reported for the incident-energy range 1--18 eV. Absolute electron scattering cross sections for elastic collisions, individual vibrational excitations, and the sum of electronic transitions are obtained by performing…
The retarded modes of a superlattice comprising alternating layers of two magnetic media characterized by a gyrotropic permeability tensor are investigated. The transfer matrix and dispersion relation are given in general form; a number of previous results are included as special cases. An effective-medium description…
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High-resolution x-ray photoelectron spectroscopy has been used to study the formation of the aluminum/polyimide (Al/PI) interface at room temperature. Aluminum films up to 80 Å thick were vapor deposited onto cured polyimide in situ. Our results show that Al is chemically active for coverages below ∼20 Å. Preferential…
An analytical method is proposed to determine absolute total cross sections per scatterer and related mean free paths for low-energy electron scattering in disordered molecular solid films. The procedure is based on a two-stream multiple-scattering model of the thickness dependence of the film reflectivity for elastic…
In order to study the phase-separation process near the critical point of fluid mixtures (spinodal decomposition) without the influence of the Earth's gravity, we have used a carefully density-matched system of deuterated cyclohexane, cyclohexane, and methanol. Such a system is known to behave as a real binary fluid […
The refractive index of the polymer np is adjusted relative to the ordinary refractive index of dispersed droplets of nematic liquid crystal no to regulate the angle of maximum transmission through a film in the presence of an applied field. Maximum transmission occurs at normal incidence when np≤no with the breadth o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAlgorithms for the identification of three-dimensional maximal common substructuresAndrew T. Brint and Peter WillettCite this: J. Chem. Inf. Comput. Sci. 1987, 27, 4, 152–158Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inis…
Abstract Using three methods to attempt to identify the presence of ester‐linked porphyrins in Photofrin® II, lithium aluminum hydride reduction, basic hydrolysis and proton NMR. it can be concluded that 40‐50% of such linkages are present. The majority of the remaining material is cleaved by acid hydrolysis, which is…
Solubility of NiO in Al 2 O 3 was determined by electron probe microanalysisy A diffusion couple method was used by coupling an NiO‐doped Al 2 O 3 polycrystal to a pure single crystal of Al 2 O 3 . The solubility of NiO in Al 2 O 3 in air was 230 wt ppm (157 at. ppm of cations) and 170 wt ppm (116 at. ppm) at 2073 and…
Abstract Für Bauteile, die mit Benzin, Kerosin und Mineralölen in Kontakt kommen, werden in zunehmendem Maße organische Werkstoffe eingesetzt, wie z.B. hochdichtes Polyethylen, Phenolharze, Polyamide, Polyester, Acrylharze, Epoxy‐ und Fluorcarbonharze, allein oder als Verbundwerkstoffe mit Glas‐, Kohlenstoff‐ und Aram…
Introduces students to X-ray photoelectron spectroscopy, the chemical information revealed by the "chemical shift", the surface sensitivity of the technique, and the enhancement of composite data by employing nonlinear least-squares curve-fitting routines.