標(biāo)準(zhǔn)號：BS EN ISO 11401-1998
中文標(biāo)準(zhǔn)名稱：塑料.酚醛樹脂.用液體色譜法分離
英文標(biāo)準(zhǔn)名稱：Plastics - Phenolic resins - Separation by liquid chromatography
標(biāo)準(zhǔn)類型：G31
發(fā)布日期：1998/10/15 12:00:00
實施日期：1998/10/15 12:00:00
中國標(biāo)準(zhǔn)分類號：G31
國際標(biāo)準(zhǔn)分類號：83.080.10
適用范圍：1 This International Standard specifies chromato-graphic 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 dihydro-xydiphenylmethanes (in novolaks) and various methylolphenols (in resols) are quantitatively separ-ated in this procedure, high-molecular-weight compo-nents of the resins are only incompletely separated due to the multitude of isomers. Methods B and C (high-performance liquid chroma-tography) separate the compounds in the resin ac-cording to molecular weight and polarity. Molecular-weight effects predominate on polar sta-tionary phases (method B), and the effect of polarity on non-polar stationary phases (method C). These methods also allow quantitative determination of in-dividual low-molecular-weight resin components. Be-cause of the different resin solubilities, method B is more suitable for novolaks and method C for resols. 2 The methods are applicable to phenolic resins that are soluble in the solvents and solvent blends used. 3 This test is useful for characterization of pro-ducts and for research.