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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 34 (1983), S. 764-764 
    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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  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 57 (1962), S. 241-254 
    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: The bis-chlorocarbonates of some oligo-ethylene glycols HO - (CH2CH2O)nH (n = 1-6) were reacted with hexamethylene diamine, m-toluylene diamine, p-phenylene diamine respectively to form the corresponding cyclic diurethanes. The dependency of the yield regarding the ringsize shows a maximum with 17 members in the ring. Also the catalyzed reaction of diisocyanates with diols was used for the preparation of cyclic urethanes.In the presence of di-n-butyltin-dilaurate exchange reactions were observed between hydroxyl-endgroups and urethane-groups as well as between urethane-groups.
    Notes: Die Bis-chlorkohlensäureester einiger Oligoäthylenglykole HO - (CH2CH2O)nH (n = 1-6) wurden mit Hexamethylendiamin, m-Toluylendiamin bzw. p-Phenylendiamin zu den entsprechenden Cyclodi-urethanen umgesetzt. Die Ausbeute in Abhängigkeit von der Ringgröße ergibt ein Maximum bei einer Ringgliederzahl von etwa 17. Ebenso wird die katalysierte Reaktion von Diisocyanaten mit Diolen zur Darstellung von Cyclo-urethanen benutzt.In Gegenwart von Di-n-butylzinndilaurat werden Austauschreaktionen sowohl zwischen Hydroxylendgruppen und Urethangruppen als auch zwischen Urethangruppen beobachtet.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 43 (1961), S. 98-105 
    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: Several cyclic diurethanes were synthesized by two different methods applying RUGGLIZIEGLER'S principle of dilution. Only by preparation from diamines and diol-bis-chlorocarbonate good yields could be obtained. Using diols and diisocyanates as starting materials linear polyurethans were the main products.
    Notes: Mehrere Cyclodiurethane wurden unter Anwendung des RUGGLI-ZIEGLERschen Verdünnungsprinzips nach zwei verschiedenen Verfahren synthetisiert. Bei der Darstellung aus Diaminen und Diol-bis-chlorkohlensäureestern konnten die Verbindungen in guten Ausbeuten gewonnen werden. Dagegen werden bei Anwendung von Diolen und Diisocyanaten als Ausgangsmaterialien im wesentlichen lineare Polyurethane erhalten.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 49 (1977), S. 42-42 
    ISSN: 0009-286X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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