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  • 1
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Sieben polymerhomologe Proben eines thermoplastischen Polyurethans (TPU) wurden in verdünnter Lösung in N-Methyl-2-pyrrolidinon (NMP) mit Größenausschlußchromatographie (SEC) auf Normalphase-Silicagel, Viskosimetrie bei kleinem Schergefälle und Membranosmometrie charakterisiert. Die Staudinger-Mark-Houwink (SMH)-Konstanten dieser homologen Serie wurden mit einer neuen Methode auf der Basis der universellen Kalibrierung der SEC mit engen Polystyrol-Standards berechnet. Die ermittelten SMH-Konstanten dieser TPU-Proben in NMP bei 298 K (K = 3,94 mL g-1, a = 0,29) bewiesen die verzweigte Struktur dieser TPU-Proben und wurden durch die Osmometrie bestätigt.
    Notes: Seven homologous samples of a thermoplastic polyurethane (TPU) were characterized in dilute solutions of N-methyl-2-pyrrolidinone (NMP) by size exclusion chromatography (SEC) on normal-phase silica gel, low-shear viscometry and membrane osmometry. The Staudinger-Mark-Houwink (SMH) constants of this homologous series were obtained by a new procedure of calculation on the basis of universal calibration of SEC with narrow polystyrene standards. The calculated SMH constants for these TPU samples in NMP at 298 K (K = 3.94 mL g-1, a = 0.29) prove the branched structure of this TPU samples and were further confirmed by osmometry.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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