Plastics - Phenolic resins - Separation by liquid chromatography (ISO 11401:1993)
Действует
Печатная копияПечатное издание
129.89 € (включая НДС 20%)
Разработчик:
Зарубежные/ON
ICS:
83.080.10 Thermosetting. Including ebonite / Термореактивные материалы
Описание
1.1 This International Standard specifies chromatographic methods for the Separation of phenolic resins into their component compounds. Separation takes place according to molecular weight and/or polarity. There are various liquid chromatographic methods: A: Gel-permeation chromatography B: High-performance polar columns Ce l-ligh-performance non-polar columns liquid chromatography on liquid chromatography on lt is possible to separate a phenolic resin into its components according to molecular size using method A (gel-permeation chromatography). Whereas free Phenol and the sum of the dihydroxydiphenylmethanes (in novolaks) and various methylolphenols (in resols) are quantitatively separated in this procedure, high-molecular-weight components of the resins are only incompletely separated due to the multitude of isomers. Methods B and C (high-performance liquid chromatography) separate the compounds in the resin according to molecular weig ht and polarity. Molecular-weight effects predominate on polar stationary phases (method B), and the effect of polarity on non-polar stationary phases (method C). These methods also allow quantitative determination of individual low-molecular-weight resin components. Because of the different resin solubilities, method B is more suitable for novolaks and method C for resols. 1.2 The methods are applicable to phenolic resins that are soluble in the solvents and solvent blends used. 1.3 This test is useful for characterization of products and for research Diese Norm beschreibt chromatographische Verfahren zur Auftrennung von Phenolharzen in ihre Bestandteile. Die Trennung erfolgt nach relativer Molekularmasse und/oder Polarität. Es gibt verschiedene Verfahren der Flüssigchromatographie: Gelchromatographie, Hochleistungsflüssigchromatographie auf polaren Kolonnen; Hochleistungs-Flüssigchromatographie auf unpolaren Kolonnen. Die Verfahren sind für Phenolharze, die in den verwendeten Lösungsmitteln und Lösungsmittelgemischen löslich sind, anwendbar. Das Verfahren ist zur Charakterisierung von Produkten und für Forschungsarbeiten nützlich.