GB/T 33388-2016 in English

《GB/T 33388-2016塑料 酚醛树脂组分的测定 液相色谱法》由TC15（全国塑料标准化技术委员会）归口，TC15SC11（全国塑料标准化技术委员会热固性塑料分会）执行，主管部门为中国石油和化学工业联合会。

Plastics - Determination of phenolic resin compositions - Liquid chromatography

1 Scope

This 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 three liquid chromatographic methods:

Method A——Gel-permeation chromatography;

Method B——High-performance liquid chromatography on polar columns;

Method 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.

Methods B and C (high-performance liquid chromatography) separate the compounds in the phenolic 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 individual low-molecular-weight resin components. Because of the different resin solubilities, Method B is more suitable for novolaks and Method C for resols.

This standard is applicable to phenolic resins that are soluble in the solvents and solvent blends used.

This standard is useful for characterization of products and for research.

Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test methods
5 Test report