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  • 1
    Electronic Resource
    Electronic Resource
    A pyridine alkaloid from Ceropegia juncea
    Amsterdam : Elsevier
    Phytochemistry 30 (1991), S. 2449-2450 
    Details
    ISSN: 0031-9422
    Keywords: Asclepiadaceae ; Ceropegia juncea ; cerpegin. ; pyridine-alkaloid
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9422(91)83683-C
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  • 2
    Electronic Resource
    Electronic Resource
    Compatibility studies of solution-blended poly(acrylonitrile)/poly(n-butyl methacrylate) (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 54 (1994), S. 1537-1544 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Poly(acrylonitrile) (PAN) was solution blended with poly(n-butyl methacrylate) (PnBMA) in various proportions. Compatibility in these blend systems was analyzed using ultrasound. The ultrasound velocity and attenuation results show that the two polymers formed a compatible blend. Viscosity and other derived parameters like free volume and internal pressure of the blends show that PAN form into an ideal blend with PnBMA in the compositions of 60 : 40 and 40 : 60. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070541018
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis and characterisation of new polymaleamides from N,N′-ethanedianilinebisisomaleimide with some aromatic diamines (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Polymer International 39 (1996), S. 141-152 
    Details
    ISSN: 0959-8103
    Keywords: polymaleamides ; N,N′-ethanedianilinebismaleamic acid ; N,N′-ethanedianilinebisisomaleimide ; aromatic diamines ; ring-opening polymerisation ; IR spectra ; 13C NMR spectroscopy ; UV-visible spectroscopy ; thermogravimetry ; differential scanning calorimetry ; mass spectra ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Five polymaleamides have been synthesised by the ring-opening polyaddition of N,N′-ethanedianilinebisisomaleimide (EBIMI) with aromatic diamines (having methyl or methoxy ring substituents) at room temperature; EBIMI was synthesised from N,N′-ethanedianilinebismaleamic acid. Infrared, 13C NMR, and UV-visible spectroscopies, inherent viscosity measurements, thermogravimetry, differential scanning calorimetry and mass spectrometry have been used to characterise these polymers.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Termination of ceric ion initiated vinyl polymerization by chromic acid (1971)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 144 (1971), S. 223-234 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Einwirkung von Chromsäure auf die durch Cerperchlorat in HClO4 bei 35°C initiierte Polymerisation von Acrylnitril, Methylacrylat und Methylmethacrylat wurde untersucht. Der Umsatz wurde durch den Zusatz kleiner Mengen von Cr(VI) (∼10-4 m) erheblich herabgesetzt (von ca. 47 auf ca. 9%). Die Veränderung von Rp, P̄ und die Geschwindigkeit der Abnahme der Gesamtmetallionenkonzentration (Cr6⊕ + Ce4⊕) unter verschiedenen Reaktionsbedingungen ließen darauf schließen, daß Initiierung durch Ce4⊕ und Abbruch durch Ce4⊕ und einen Cer-Chromat-Komplex erfolgte. Die Bildung des letzteren wurde durch spektrophotometrische Versuche gestützt. Die Verhältnisse der Geschwindigkeitskonstanten für diesen Abbruch werden für die drei Monomeren ermittelt. Es zeigte sich, daß der Komplex ein stärkeres Oxidationsmittel ist als Ce(IV) oder Cr(VI) allein.
    Notes: The effect of chromic acid on the polymerization of acrylonitrile, methyl acrylate and methyl methacrylate initiated by ceric perchlorate in HClO4 medium at 35°C was studied. Monomer conversion decreased considerably (from ca. 47 to ca. 9%) by the addition of small amounts of Cr(VI) (∼10-4M). The dependence of Rp, the rate of total metal ion (Cr6⊕ + Ce4⊕) disappearance and P̄ on the various variables suggested that the initiation occurred by Ce4⊕ and termination by both Ce4⊕ and ceric-chromate complex. The formation of the latter was supported by spectrophotometric studies. The ratios of the rate constants for termination by the complex and by ceric ion for the three monomers were evaluated. The results showed that the complex was a more powerful oxidant than either Ce(IV) or Cr(VI).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1971.021440117
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  • 5
    Electronic Resource
    Electronic Resource
    Termination of vinyl polymerization involving Cr6+ (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part B: Polymer Letters 6 (1968), S. 629-633 
    Details
    ISSN: 0449-2986
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.110060904
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  • 6
    Electronic Resource
    Electronic Resource
    Vinyl polymerization initiated by chromic acid-reducing agent systems (1971)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 9 (1971), S. 1685-1699 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A kinetic study of the thermal polymerization of acrylonitrile initiated by chromic acid-reducing agent (n-butanol, ethylene glycol, cyclohexanone, and acetaldehyde) systems was made. Chromic acid alone did not initiate polymerization under deaerated or undeaerated conditions. On the basis of the experimental determination of the dependencies of various variables on the rate of polymerization Rp, the rate of chromium (VI) disappearance -RM, the degree of polymerization DP, etc., a reasonable kinetic scheme was arrived at. The mechanism with the reducing agents, n-butanol, cyclohexanone, and ethylene glycol, was found to be similar but different from that with acetaldehyde. Evidence has been presented to prove the formation of radical intermediates formed by the oxidation of the reducing agent by Cr(IV). Rate parameters for oxidation of the reducing agent and polymerization of the monomer were evaluated.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1971.150090618
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