General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest
GB/T 33388-2016
Scope
This standard specifies the method for separating phenolic resin components by liquid chromatography. The method of fractionation is based primarily on molecular size and/or polarity (of the individual components). There are mainly the following three liquid chromatography methods: Method A—gel permeation chromatography; method B—polar column high performance liquid chromatography; method C—nonpolar column high performance liquid chromatography. Method A (Gel Permeation Chromatography), different molecular weight components of phenolic resins can be separated due to different molecular sizes, however only small molecular weight components such as free phenol and dihydroxydiphenylmethane (thermoplastic resins) and Various hydroxymethylphenols (thermosetting resins) can be completely separated, and high molecular weight components can only be partially separated due to the existence of many isomers. Method B and method C (high performance liquid chromatography) are separated according to the molecular weight and polarity of the components in the phenolic resin. Method B is mainly based on molecular weight separation on a polar column, and method C is mainly based on polarity separation on a non-polar column. Both methods allow quantitative analysis of low molecular weight components. Due to the different solubility of the resins, method B is suitable for thermoplastic resins and method C is suitable for thermosetting resins. This standard applies to phenolic resins that can be dissolved in solvents and mixed solvents. This standard can be used for product characterization work and some related research work.