Plastics — Determination of average molecular mass and mixture ratio of poly(ethylene glycol) and its derivatives by MALDI-TOF-MS (ISO 19929:2017)
This document specifies a general method for determining the average molecular mass and mixtureratio of poly(ethylene glycol) (PEG) and its derivatives with different end groups by matrix-assistedlaser desorption/ ionization time-of-flight mass spectrometry (MALDI-TOF-MS). It is applicable to PEGand its derivatives with molecular masses from 500 g mol−1 to 20 000 g mol−1. The composition iscalculated by means of a calibration curve constructed using standard polymer mixtures, where thepeak area ratio is plotted versus the mass ratio. This document can be applied to other polymers withmonomeric unit similar to PEG.
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