ISO 24076:2021
Plastics — Polypropylene (PP) — Determination of isotactic index by low-resolution nuclear magnetic resonance spectrometry
This document specifies a relative method for the determination of polypropylene (PP) isotactic index by low-resolution pulsed nuclear magnetic resonance spectroscopy (LR-NMR).
This method enables the identification and coding of types H propylene (PP-H) plastics according to ISO 19069‑1.
This method is suitable for base polymers and is not applicable for mixtures.
NOTE The direct method for the determination of polypropylene isotactic index is specified in ISO 9113.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Preparation of sample
6.1 General
6.2 Reference samples
7 Method A — Ratio method
7.1 Procedure
7.1.1 Measurement of reference samples by n-heptane extraction
7.1.2 LR-NMR measurement procedure of reference samples
7.1.3 LR-NMR measurement procedure of test samples
7.2 Calculation
7.2.1 Calibration curve
7.2.2 Calculation of isotactic index IIna
8 Method B — Absolute method
8.1 Procedure
8.1.1 Measurement of reference samples by n-heptane extraction
8.1.2 LR-NMR measurement procedure of reference samples
8.1.3 LR-NMR measurement procedure of test samples
8.2 Calculation
8.2.1 Calibration curve
8.2.2 Calculation of isotactic index IInb
9 Expression of results
10 Test report
Annex A (informative) Example of a calibration curve for method A
Annex B (informative) Example of a calibration curve for method B
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Preparation of sample
6.1 General
6.2 Reference samples
7 Method A — Ratio method
7.1 Procedure
7.1.1 Measurement of reference samples by n-heptane extraction
7.1.2 LR-NMR measurement procedure of reference samples
7.1.3 LR-NMR measurement procedure of test samples
7.2 Calculation
7.2.1 Calibration curve
7.2.2 Calculation of isotactic index IIna
8 Method B — Absolute method
8.1 Procedure
8.1.1 Measurement of reference samples by n-heptane extraction
8.1.2 LR-NMR measurement procedure of reference samples
8.1.3 LR-NMR measurement procedure of test samples
8.2 Calculation
8.2.1 Calibration curve
8.2.2 Calculation of isotactic index IInb
9 Expression of results
10 Test report
Annex A (informative) Example of a calibration curve for method A
Annex B (informative) Example of a calibration curve for method B
Bibliography