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  • 1985-1989  (5)
  • 1989  (5)
  • Chemistry  (5)
  • Analytical Chemistry and Spectroscopy  (4)
Material
Years
  • 1985-1989  (5)
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 165 (1989), S. 47-67 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Respropiophenon-Formaldehyd-Copolymere wurden durch Kondensation von 2,4-Dihydroxypropiophenon (Respropiophenon (RPP)) und Formaldehyd (F) in Gegenwart von NaOH oder H2SO4 als Katalysator mit unterschiedlichen molaren Anteilen der Monomeren hergestellt. Die Copolymeren wurden durch Elementaranalyse, IR-Spektroskopie, Viskositäts- und thermogravimetrische Untersuchungen charakterisiert. Ihr durchschnittliches Molekulargewicht wurde durch nichtwäßrige Leitfähigkeitstitrationen und Dampfdruckosmometrie bestimmt. Die Chelat-Ionenaustauscher-Eigenschaften wurden unter Anwendung der Batch-Gleichgewichtsmethod untersucht. Polychelate von Cu(II), Ni(II), Co(II), Mn(II), Zn(II), VO(II) und UO2(II) mit RPP-F-AI Copolymeren wurden horgestellt. Die analytischen Daten zeigen eine 1 : 2 Metall-Ligand-Stöchiometrie. Es wurden Elementaranalyse, magnetische, spektroskopische und thermische Eigenschaften der Polychelate ermittelt und mögliche Strukturen der Polychelate aufgezeigt. Alle Polychelate sind amorphe Pulver und unlöslich in den herkömmlichen organischen Lösungsmitteln.
    Notes: Respropiophenone-formaldehyde copolymers (RPP-F) were synthezised by the condensation of 2,4-dihydroxypropiophenone (respropiophenone (RPP)) and formaldehyde (F) in the presence of NaOH or H2SO4 as catalyst with varied molar ratios of reacting monomers. The copolymers were characterized by elemental analysis, IR spectra, viscosity, and TGA studies. Their M̄n was determined by nonaqueous conductometric titrations and vapour pressure osmometry (VPO). Chelation ion-exchange properties have also been studied employing the batch equilibration method. Polychelates of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), VO(II), and UO2(II) with RPP-F-AI copolymer were prepared. The analytical data agree with 1 : 2 metal-ligand stoichiometry. Elemental analysis, magnetic, spectral, and thermal properties of polychelates have been studied and probable structures are assigned to the polychelates. All the polychelates are amorphous powders, insoluble in common organic solvents.
    Additional Material: 8 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 15-18 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: SEM micrographs showing porous structures and bonding of pores through broken mica flakes are presented. Pores of varying dimensions (10-400 μm) are formed. Interlayer spaces in mica are shown to be the preferential direction for heat and subsequently crack propagation during heat treatment for producing cellular insulating bricks at 900°C. The cracks end up with the formation of large pores in the presence of foaming agent and sodium silicate.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 215-218 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The surface structure of silicon carbide whiskers, produced from rice husk at 1500-1800°C, was examined by x-ray photoelectron spectroscopy. An ESCA survey scan of the surface showed Si, C, O and F to be present; Si in the form of SiCx and SiOx and C in the form of SiCx and CHx. On sputtering the sample, the SiOx and CHx species were reduced and the SiCx level increased. The photoelectron spectra are presented.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 219-224 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The structural characterization of alumina fibres obtained from an aluminium salt and three natural fibres (jute, sisal and coir) was examined by EDXRF and XRD. Elemental composition spectra from EDXRF of fibres pyrolysed at 1200 and 1400°C are presented and the results are compared with those obtained by wet chemical analysis and atomic absorption spectrometry. XRD diffractograms of the same samples are also shown. The evolution of the α phase of alumina with increase in pyrolysis temperature was examined. Scanning electron micrographs of alumina fibre with jute fibre are also presented.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 18 (1989), S. 267-269 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: Rice husk was heat treated up to 1300°C and the products were examined by scanning electron microscopy. The fibrous structure of the initial rice husk persisted throughout. Cristobalite and tridymite were detected in the product at 1250°C by x-ray diffraction. The fibrous structures were characterized and shown to have a bearing on the formation of SiC whiskers as substrates.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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