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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis and characterization of polyaryloxyphosphazene copolymers (1977)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 15 (1977), S. 361-369 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A series of polyaryloxyphosphazene copolymers with the general formulas [NP(OC6H5)(OR)]n and [NP(OC6H4-4-OCH3)(OR)]n, where R = C6H4-4-CH3, C6H4-4-C2H5, C6H4-4-isoC3H7, C6H4-4-sec-C4H9, C6H4-4-tert-C4H9, C6H4-4-OCH3 or C6H4-4-OC4H9, have been prepared under anhydrous conditions. Copolymers as well as selected homopolymers were prepared by the reaction of polydichlorophosphazene with appropriate sodium aryloxides. Each of the polymers was characterized by elemental analysis, infrared spectroscopy, gel-permeation chromatography, and differential scanning calorimetry. Elemental analysis established the empirical formula for the polymers and showed that there were no residual P—Cl bonds left on the polymer backbone. Infrared spectroscopy indicated the presence of a phosphorus-nitrogen backbone with two aryloxy groups bonded to each phosphorus atom. The copolymers examined exhibited molecular weights of above 1 × 106. Polyaryloxyphosphazene copolymers were examined by differential scanning calorimetry and compared to several of the corresponding homopolymers. Glass transition temperatures ranged between -34 and +44°C for the polymers. The Kelley-Bueche equation was used to predict the glass transition temperatures of the copolymers. Close agreement was found between calculated and experimental values for most of the systems examined.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1977.170150210
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal degradation of polybis(p-isopropylphenoxy)-phosphazene (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 1505-1515 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Polybis(p-isopropylphenoxy)phosphazene was treated thermally at 100, 135, 200, and 300°C. The resulting reductions in weight-average molecular weights were monitored by gel-permeation chromatography, and the experimental observations led to the adoption of a random chain-scission model. An effective energy of activation and entropy of activation were calculated for the degradation process, and these values were found to be consistent with a random-scission model. The analysis was, in part, based on a computer-simulated first-order degradation model. This polymer showed higher thermal stability than previously reported polyaryloxyphosphazenes.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160705
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  • 3
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    Dopamine-related tetrahydroisoquinolines: significant urinary excretion by alcoholics after alcohol consumption (1979)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1979-12-07
    Description: Concentrations of dopamine-related tetrahydroisoquinolines (salsolinol and O-methylated salsolinol) were significantly higher in the daily urine samples of alcoholic subjects admitted for alcohol detoxification than in the daily urine samples of nonalcoholic control subjects. Salsolinol concentrations in alcoholic subjects appeared to drop to trace (control) values 2 to 3 days after admission, following the disappearance of ethanol and its reactive metabolite acetaldehyde from the blood. These results indicate that physiologically active tetrahydroisoquinolines increase in humans during long-term alcohol consumption, presumably because of acetaldehyde's direct condensation with catecholamines. The presence of these or similar condensation products in the urine could be useful as clinical indicators of prior blood acetaldehyde concentrations in chronic alcoholics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Collins, M A -- Nijm, W P -- Borge, G F -- Teas, G -- Goldfarb, C -- New York, N.Y. -- Science. 1979 Dec 7;206(4423):1184-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/505002" target="_blank"〉PubMed〈/a〉
    Keywords: Acetaldehyde/blood ; Adult ; Alcoholism/metabolism/*urine ; Dopamine/*metabolism ; Humans ; Isoquinolines/*urine ; Male ; Middle Aged ; Salsoline Alkaloids/urine ; Substance Withdrawal Syndrome/urine
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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