Standard

NS-EN ISO 11401:1998

Publisert
Forhåndsvisning

Rettelser og tillegg kjøpes separat.

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Omfang

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 liquid chromatography on polar columns C: High-performance liquid chromatography on non-polar columns It 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. Method B and C (high-performance liquid chromatography)separate the compounds in the resin according to molecular weight 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 induvidual 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.

Dokumentinformasjon

  • Standard fra SN
  • Publisert:
  • Utgave: 1
  • Versjon: 1
  • Varetype: NAT
  • ICS 83.080.10
  • National Committee SN/K 138/ NS 416

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