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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 16-21 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: A Monte Carlo model for the simulation of the process of network building by polycyclotrimerization of difunctional monomers basing on the reaction mechanism of the polycyclotrimerization of aromatic dicyanates was developed. The experimental dependences of the average molar mass, the mass fractions of the first oligomers and of the gel fraction on the conversion of functional groups, measured for the reaction of 2, 2-bis(4-cyanatophenyl) propane in bulk, can be well fitted by the model. Furthermore, the possiblities of the simulation of intramolecular cyclizations and substitution effects are discussed.
    Notes: Auf Basis des Reaktionsmechanismus der Polycyclotrimerisierung aromatischer Dicyanate wurde ein Monte-Carlo-Modell zur Simulation der Netwerkbildung durch Polycyclotrimerisierung difunktioneller Monomere entwickelt. Die experimentell ermittelten Abhängigkeiten der mittleren Molmasse, der Massenanteile der ersten Oligomere und des Gelanteils vom Umsatz der funktionellen Gruppen bei der Reaktion von 2, 2-Bis (4-cyanatophenyl) propan in Schmelze werden durch das Modell gut erfaßt. Weiterhin werden Möglichkeiten der Simulation von intramolekularen Cyclisiierungen und Substituenteneffekten diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 397-401 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: A model of the reaction between glycidylethers and aromatic cyanates is established. It was found that the trimerization of cyanates, the insertion of glycidylethers, the isomerisation of alkylcyanurates, the oxazolidinone build up, the abstraction of the phenols, and the phenol/glycidylether-addition are the main reactions.
    Notes: Ein Reaktionsmodell der Umsetzung von Glycidethern mit aromatischen Cyansäureestern wird begründet. Als Hauptreaktionen wurden die Trimerisierung der Cyansäureester, die Einschubreaktion der Glycidether in die Cyanuratstruktur, die Isomerisierung der Alkylcyanurate, die Oxazolidinonbildung, die Phenolabspaltung und die Phenol/Glycidether-Addition gefunden.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The chemical structures formed at the reaction of glycidylethers with aromatic cyanates were identified. In dependence on the molar ratio of the monomers, different parts of triazines, alkylisocyanurates, oxazolidinones, phenols, secondary hydroxyl groups, and double bonds were obtained.
    Notes: Die bei der Reaktion von Glycidethern und aromatischen Cyansäureestern gebildeten chemischen Strukturen wurden identifiziert. In Abhängigkeit vom Stoffmengenverhältnis der Monomere wurden unterschiedliche Anteile an Triazinen, Alkylisocyanuraten, Oxazolidinonen, Phenolen, sekundären Hydroxylgruppen und Doppelbindungen erhalten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: By DSC-experiments with constant heating rate or under isothermal conditions the complex character of the thermal polycyclotrimerisation of 2,2-bis(4-cyanatophenyl)propane in bulk is shown. An activation energy of 80 kJ/mol for the first order brutto kinetics is calculated by several methods.
    Notes: Aus DSC-Messungen mit konstanter Heizrate und unter isotherman Bedingungen wird der komplexe Charakter der thermischen Polycyclotrimerisierung von 2,2-Bis(4-cyanatophenyl)propan in der Schmelze ersichtlich. Für die Bruttoreaktion 1. Ordnung wird nach verschiedenen Auswertemethoden eine Aktivierungsenergie von 80 kJ/mol erhalten.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 393-396 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The electrical properties of polycyanurates and their modifications with polyglycidylether are described. The usefulness of these polymers as excellent electrical insulation materials is demonstrated by two examples.
    Notes: Elektrische Eigenschaften reiner und mit Polyglycidethern modifizierter Polycyanurate werden aufgezeigt. An zwei Beispielen wird der Einstatz von Diandicyanat-Dianbisglycidether-Kombinationen als Elektroisolierstoff beschreieben.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 654-654 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 654-655 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 715-719 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Kinetik der thermischen Polycyclotrimerisierung von 2,2-Bis(4-cyanatophenyl)propan wurde mit Hilfe von DSC und IR-Spektroskopie untersucht. Der autokatalytische Charakter der Reaktion wurde durch Modellierung der Umsatz-Zeit-Kurven bei Zusatz difinierter Mengen der nachgewiesenen Zwischenprodukte aufgeklärt. Weiterhin wurden quantitative Beziehungen zwischen Reinheitsgrad des Dicyanats, Geschwindigkeit der Bruttoreaktion, Lage des DSC-Maximums und B-Zeit gefunden.
    Notes: The kinetics of polycyclotrimerization of 2,2-bis(4-cyanatophenyl)propane was analyzed by differential scanning calorimetry and IR spectroscopy. The autocatalytic character of the reaction was elucidated by modelling the conversion-time curves of systems with definite admixtures of the found intermediate products. Furthermore, quantitative relations between the purity of the dicyanate, the rate of the brutto reaction, the temperature of the DSC maximum, and the B-time of the resin were found.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 679-680 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Molecular weight distributions of branched poly(phenylquinoxa1ines) synthesized by polycondensation of aromatic bis(l,2-diamines) with bis- and tris(l,2-diketones) were calculated based on a special a-priori branching model from gelchromatographic and viscosimetric data. Under the rcactioti conditions considered random reaction of all functional groups is suggested.
    Notes: Die Molmassenverteilungen von durch Polykondensation aromatischer Bis(1,2-diamine) mit Bis- und Tris(1,2-diketonen) synthetisierten verzweigten Polyphenylchinoxalinen wurden auf der Grundlage eines speziellen a-priori-Verzweigungsmodells aus gelchromatographischen und viskosimetrischen Daten berechnet. Damit kann für die angewendeten Synthesebedingungen eine zufällige Reaktion aller funktionellen Gruppen angenommen werden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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