ISO DIS 19929

Description / Abstract: This standard 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). The molecular masses of PEG and its derivatives are 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 standard may be applied to other polymers with monomeric unit similar to PEG