塑料. 采用MALDI-TOF-MS测定聚乙二醇及其衍生物的平均分子质量和混合比

[中文适用范围]： 本文件规定了通过基质辅助激光解吸/电离飞行时间质谱（MALDI-TOF-MS）测定聚乙二醇（PEG）及其不同端基衍生物的平均分子量和混合比例的通用方法。适用于分子量在500 g mol−1至20 000 g mol−1范围内的PEG及其衍生物。组成通过使用标准聚合物混合物构建的校准曲线计算，其中峰面积比与质量比对应。本方法可应用于单体单元类似PEG的其他聚合物。 [外文原描述]： ISO 19929:2017 specifies a general method for determining the average molecular mass and mixture ratio of poly(ethylene glycol) (PEG) and its derivatives with different end groups by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). It is applicable to PEG and its derivatives with molecular masses from 500 g mol −1 to 20 000 g mol −1 . The composition is calculated by means of a calibration curve constructed using standard polymer mixtures, where the peak area ratio is plotted versus the mass ratio. This document can be applied to other polymers with monomeric unit similar to PEG.