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  • 1
    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: Urea formaldehyde particles formed by acid-catalyzed condensation were investigated by infrared spectroscopy. Depending on the composition three different structures were found. At molar ratio F/H 〈 1.25 linear crystalline methylene ureas were obtained, at F/H 〉 1.25 dimethylene ether linkages, and only when the reaction is carried out under strong acid conditions cyclic structures (urons) are formed.
    Notes: Durch säurektalysierte Polykondensation hergestellte feinverteilte Harnstoff-Formaldehyd-Feststoffe wurden infrarotspektroskopisch untersucht. In Abhängigkeit von der Zusammensetzung wurden drei verschiedene Strukturen gefunden. Bei einem Molverhältnis F/H 〈 1,25 wurden lineare kristalline Methylenharnstoffe erhalten, bei F/H 〉 1,25 Dimethylenetherstrukturen und nur unter stark sauren Bedingungen cyclische Strukturen (Urone).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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