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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 17 (1987), S. 431-438 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary Poly(butadienes) were modified by an ‘ene’-reaction using 4-phenyl-1, 2,4-triazoline-3,5-dione (1) 3′-nitro-4′-hydroxyphenyl-1, 2,4-triazoline-3,5-dione (2) and 4′-hydroxyphenyl1, 2,4-triazoline-3,5-dione (3). The resulting hydrogen bond complexes between urazole groups act as thermoreversible crosslinks and alter the melt rheological behaviour. While dimeric chelate-like complexes are formed in polymers modified with 1 or 2, a three dimensional structure of hydrogen bond complexes is formed if 3 is used as the modifying agent. The thermorheologically complex behaviour of the latter material is interpreted by structural changes in the three dimensional structure with temperature.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 120 (1987), S. 691-694 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Starting from 4-aminophenol, 4-(4-hydroxyphenyl)-1,2,4-triazoline-3,5-dione (4) and 4-(4-hydroxy-3-nitrophenyl)-1,2,4-triazoline-3,5-dione (11) are synthesized. Contrary to the base-catalyzed formation of the unsubstituted phenyl derivative 1, the heterocycle 9 is formed by heating of 1-(ethoxycarbonyl)-4-[4-(trimethylsilyloxy)phenyl]semicarbazide (8). By treatment of 4-(4-hydroxyphenyl)urazole (9) with NO2 nitration of the aromatic ring and oxidation occur simultaneously with formation of 11. Oxidation by tert-butyl hypochlorite gives 4. First investigations on polybutadienes modified with 1, 4, 11 show the influence of the additional hydroxy group to the mechanical properties.
    Notes: Ausgehend von 4-Aminophenol wurden 4-(4-Hydroxyphenyl)-1,2,4-triazolin-3,5-dion (4) und 4-(4-Hydroxy-3-nitrophenyl)-1,2,4-triazolin-3,5-dion (11) hergestellt. Im Gegensatz zum basenkatalysierten Ringschluß zur nichtsubstituierten 4-Phenylverbindung 1 wird der Heterocyclus 9 beim Erhitzen von 1-(Ethoxycarbonyl)-4-[4-(trimethylsilyloxy)phenyl]semicarbazid (8) gebildet, wobei quantitativ Ethoxytrimethylsilan (10) abgespalten wird. Bei der Qxidation des 4-(4-Hydroxyphenyl)urazols (9) mit NO2 tritt gleichzeitig Nitrierung des Aromaten zu 11 ein. Oxidation mit tert-Butylhypochlorit führt zu 4. Erste Untersuchungen an Additionsprodukten von 1, 4 und 11 an Polybutadien zeigen den Einfluß der zusätzlichen polaren Hydroxylgruppe auf die mechanischen Eigenschaften.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 187 (1986), S. 1681-1690 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polybutadienes and polyisoprene are modified using 4-phenyl-1,2,4-triazoline-3,5-dione. The resulting urazole moieties give rise to the formation of hydrogen bonds. From the temperature dependence of the dilute solution viscosity as well as from GPC it can be deduced that intra- and intermolecular hydrogen bonds are formed. The intermolecular hydrogen bonds can be used to overcome the demixing tendency in blends of polybutadiene and polyisoprene. DSC measurements indicate enhanced miscibility depending on the degree of modification.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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