ISO 19929:2017
Plastics — Determination of average molecular mass and mixture ratio of poly(ethylene glycol) and its derivatives by MALDI-TOF-MS
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.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
5 Reagents
6 Apparatus
7 Procedure
7.1 General
7.2 Sample preparation
7.2.1 General
7.2.2 Preparation of polymer standard mixtures
7.2.3 Preparation of polymer/matrix/salt solutions
7.2.4 Deposition of the sample on the sample plate (target)
7.2.5 Preparation of biopolymer/matrix solutions
7.3 Instrument settings
7.4 Spectra recording
8 Data acquisition and processing
8.1 General
8.2 Calibration of mass axis
8.2.1 General
8.2.2 Calibration of mass axis using synthetic polymer standards
8.2.3 Calibration of mass axis using biopolymer standards
8.2.4 Self-calibration method
8.3 Generation of mass calibration curve
8.4 Calibration of intensity axis
9 Expression of results
9.1 Calculation of molecular mass distribution (MMD)
9.2 Calculation of the number-average molecular mass
9.3 Calculation of peak area
9.4 Constructing calibration curve for intensity
9.5 Calculation of mass ratio
10 Precision
11 Test report
11.1 General
11.2 Apparatus
11.3 Calibration
11.4 Results
Annex A (normative) Calibrants
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles
5 Reagents
6 Apparatus
7 Procedure
7.1 General
7.2 Sample preparation
7.2.1 General
7.2.2 Preparation of polymer standard mixtures
7.2.3 Preparation of polymer/matrix/salt solutions
7.2.4 Deposition of the sample on the sample plate (target)
7.2.5 Preparation of biopolymer/matrix solutions
7.3 Instrument settings
7.4 Spectra recording
8 Data acquisition and processing
8.1 General
8.2 Calibration of mass axis
8.2.1 General
8.2.2 Calibration of mass axis using synthetic polymer standards
8.2.3 Calibration of mass axis using biopolymer standards
8.2.4 Self-calibration method
8.3 Generation of mass calibration curve
8.4 Calibration of intensity axis
9 Expression of results
9.1 Calculation of molecular mass distribution (MMD)
9.2 Calculation of the number-average molecular mass
9.3 Calculation of peak area
9.4 Constructing calibration curve for intensity
9.5 Calculation of mass ratio
10 Precision
11 Test report
11.1 General
11.2 Apparatus
11.3 Calibration
11.4 Results
Annex A (normative) Calibrants
Bibliography