GB/T 21863-2008 (English Version) PDF

Standard No.: GB/T 21863-2008
Language: Chinese, Available in English version
Release Date: 2008
Published By: General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
Latest: GB/T 21863-2008

Scope: This standard specifies the methods and tests for gel permeation chromatography (GPC) to determine the molecular weight distribution, number average molecular weight M_n and weight average molecular weight M_w of polymers dissolved in tetrahydrofuran (THF). condition. Even if individual polymers are chromatographically separated with good reproducibility, this method is not suitable if specific interactions (e.g. absorption) occur in the sample/eluent/separating material system. Gel Permeation Chromatography (GPC) is a relative method requiring calibration with commercially available linear polystyrene standards of known molecular weight using an absolute method. The results for polymer samples with different structures can only be used as reference values for groups of samples of the same structure. This standard is not applicable to the determination of polymers with M_n greater than 10⁶g/mol (see Appendix C). Correction methods (such as eliminating peak spread) cannot be implemented in this standard. If absolute molar masses are to be determined, absolute methods should be used (eg membrane osmometry for M_n, or light scattering for M_w).

GB/T 21863-2008 Referenced Document

DIN 50014 Standard atmospheres for conditioning and/or testing - Specifications*， 2018-08-01 Update
GB/T 20777-2006 Paints and varnishes Examination and preparation of samples for testing
GB/T 3186-2006 Paints, varnishes and raw materials for paints and varnishes. Sampling
GB/T 6379.1 Accuracy(trueness and precision)of measurement methods and results Part 1:General principles and definitions

2008 GB/T 21863-2008 Gel permeation chromatography(GPC).Tetrahydrofuran as elution solvent