ZUSAMMENFASSUNG:Die Strukturveranderungen eines Molekulkomplexes (MK) aus Polyoxyethylen und Harnstoff beim Abkuhlen aus dem geschmolzenen Zustand werden kalorimetrisch und rentgenographisch untersucht. Es wird festgestellt, dalj eine polymorphe Hochtemperaturform des MK entsteht, die beim Abkuhlen in die bekannte Kristallform des MK mit hexagonaler Kristallmodifikation ubergeht.
SUMMARYThe structural transformation of a molecular complex (MC) of polyoxyethylene and urea on cooling from the molten state has been investigated by DSC and X-ray analysis. A high-temperature polymorphic form of the MC was found to be formed, which transforms into the known crystal form of the MC with a hexagonal crystal modification on cooling.
Einfiihrung
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