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  • 1
    Electronic Resource
    Electronic Resource
    Analytik von Prepolymeren und Polymeren aromatischer Cyansäureester. 2. Hochdruckflüssigchromatographie (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 221-223 
    Details
    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: Separation of oligomeric trimerisates of difunctional aromatic cyanic acid esters is shown to be possible by the HPLC-gradient-elution-technique in THF/H2O on RP8-modified silicagel phases. The stepgrowth mechanism of the polycyclotrimerisation reaction was supported by quantitative analysis.
    Notes: Durch Gradientenelution in THF/H2O an RP8-modifizierten Kieselgel-Phasen gelingt eine Auftrennung oligomerer Trimerisate difunktioneller aromatischer Cyansäureester. Der Stufenmechanismus der Polycyclotrimerisierung wird durch quantitative Auswertung bestätigt.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370409
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  • 2
    Electronic Resource
    Electronic Resource
    Remark on the approximate character of the kinetic/structural model for the cyanate-epoxy network build-up (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 679-680 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1989.010401016
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  • 3
    Electronic Resource
    Electronic Resource
    Computer applications in chemical research and education. Hg. von J. BRANDT und I. K. UGI. ISBN 3-7785-1804-6. Heidleberg: Dr. Alfred Hüthig Verlag 1989. XIII, 449 S., geb., DM 128.- (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 143-144 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1990.010410218
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  • 4
    Electronic Resource
    Electronic Resource
    Analytik von Prepolymeren und Polymeren aromatischer Cyansäureester. 3. Differential Scanning CalorimetrieTeil 2: Acta Polymerica 37 (1986) 221-223. (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 604-606 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1986.010371002
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  • 5
    Electronic Resource
    Electronic Resource
    Analytik von Prepolymeren und Polymeren aromatischer Cyansäureester. 1. IR-Spektroskopie (1986)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 37 (1986), S. 218-220 
    Details
    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: It is shown that the CN stretching band in the region 2200 to 2300 cm-1 is suitable for fast and reliable evaluation of the OCN-conversion in soluble and gelled trimerisates of aromatic cyanic acid esters. As an internal standard the aromatic CH-stretch band is used.
    Notes: Es wird gezeigt, daß die charakteristische CN-Valenzschwingungsbande im Bereich von 2200 bis 2300 cm-1 zur schnellen und sicheren Bestimmung des OCN-Umsatzes in löslichen und gelierten Trimerisierungsprodukten aromatischer Cyansäureester geeignet ist. Als innerer Standard findet dabei die aromatische CH-Valenzschwingungsbande Verwendung.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1986.010370408
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  • 6
    Electronic Resource
    Electronic Resource
    Reaktionen polyfunktioneller Cyansäureester mit polyfunktionellen Glycidethern. 2. ReaktionsmodellTeil 1: siehe [1] (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 397-401 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1989.010400608
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  • 7
    Electronic Resource
    Electronic Resource
    Reaction of dicyanates with monophenols  -  modeling of network buildup (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 241-246 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Chemical as well as structural modifications of highly branched polycyanurates can be achieved by using the reaction of dicyanates with monofunctional phenols. The key products of this reaction are iminocarbonic esters formed by addition of cyanato and phenolic groups. Two mechanisms are discussed for the second reaction step: an addition of two cyanato groups and an iminocarbonic ester (Route A) and a stepwise addition of iminocarbonic esters (Route B). The crucial difference between the two reactions is the number of abstracted phenolic groups per formation of one triazine ring: one for Route A and three for Route B. The effects of these reaction mechanisms on the gelation behavior and network buildup are studied theoretically with the help of cascade theory as well as experimentally by the reaction of dicyanate of bisphenol A with five different monophenols. The results clearly show that only with a model which is based on Route B can both the critical conversions at the gelation threshold and the gel fractions be modeled quantitatively. Furthermore, phenols with low pKa values were found to have an increased tendency of incorporation into the network.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1995.010460305
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  • 8
    Electronic Resource
    Electronic Resource
    Zur Gelchromatographie von Polyphenylchinoxalinen - Vorschlag für ein neues Eichverfahren (1982)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 33 (1982), S. 285-287 
    Details
    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 method for calculating the calibration function for gel permeation chromatography based on the chromatogram of a polymer with known broad molecular weight distribution is proposed. A useful calibration function for polyphenylquinoxalines was calculated with a theoretical molecular weight distribution for linear alternating copolycondensation.
    Notes: Eine Methode zur Berechung der gelchromatographischen Eichbeziehung aus dem Chromatogramm eines Polymers mit bekannter breiter. Molmassenverteilung wrid vorgeschlagen. Die mit einer theorestischen Molmassenverteilung für die lineare alternierende Copolykondensation berechnete Eichbeziehung eignete sich gut zur Auswertung der Gelchromatogramme von Polyphenylchinoxalinen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1982.010330409
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  • 9
    Electronic Resource
    Electronic Resource
    Zur Bestimmung der Molmassenverteilung verzweigter Polyphenylchinoxaline durch Gelpermeationschromatographie und ViskosimetrieProfessor Dr. sc. nat. Horst Frommelt zum 60. Geburtsag gewidmet (1985)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 36 (1985), S. 16-21 
    Details
    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
    URL: http://dx.doi.org/10.1002/actp.1985.010360104
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  • 10
    Electronic Resource
    Electronic Resource
    Zur Gelchromatographie linearer Polyphenylchinoxaline  -  Vergleich verschiedener Eichverfahren (1984)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 35 (1984), S. 161-166 
    Details
    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 and the Kuhn-Mark-Houwink equation for linear polyphenylquinoxalines are calculated by application of four different GPC-calibration methods useful for broadly distributed molecular weight standards. In good agreement of the results Schulz-flory distributions are obtained.
    Notes: Die Molmassenverteilungen und die Kuhn-Mark-Houwink-Gleichung für lineare Polyphenylchinoxaline werden durch Anwendung von vier verschiedenen GPC-Eichverfahren für breit verteilte Molmassenstandards berechnet. In übereinstimmung der Ergebnisse der Verfahren werden Schulz-Flory-Verteilungen erhalten.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1984.010350211
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