GB/T 27810-2011 in English

《GB/T 27810-2011色漆和清漆用漆基 凝胶渗透色谱法（GPC） 用四氢呋喃做洗脱剂》由TC5（全国涂料和颜料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。

Scope

CAUTION—This standard may involve hazardous substances, procedures, and equipment. This standard does not intend to address all safety issues related to its use (if any), so it is the responsibility of the user of this standard to establish appropriate safety and health measures and ensure compliance with any national regulations. See Chapter 6 for specific hazard statements. This standard specifies the method for determining the molecular weight distribution, number average molecular weight M_n and weight average molecular weight M_w of polymers dissolved in THF (tetrahydrofuran) by gel permeation chromatography (GPC). Even though good reproducibility can be obtained with this method, the method cannot be used for certain polymers where special interactions occur, such as adsorption between the sample/eluent/column system. This method is not an absolute determination method, it needs to be calibrated with a commercially available unbranched polystyrene standard substance, and the molecular weight of this standard substance has been measured by an absolute method. Therefore, except for polystyrene, the determination results of polymer samples should only be used for comparison between groups of samples of the same type. The conditions specified in this standard are not applicable to the analysis of polymer samples with M_w value greater than 10⁶ by GPC (see Appendix C). There are no correction methods in this standard, such as eliminating peak broadening. If you want to get the absolute molecular weight value, you need to use absolute method to measure, such as M_n by membrane permeation method or M_w by light scattering method.