Single-sided Nuclear Magnetic Resonance for condition monitoring of cross-linked polyethylene exposed to aggressive media

Analytica Chimica Acta
A AdamsG Siegmund

Abstract

The potential of single-sided Nuclear Magnetic Resonance (NMR) to monitor truly non-invasive changes in polymer materials during aging under aggressive media is for the first time evaluated. For this, the NMR method is used in combination with other condition monitoring methods including mechanical measurements, mass uptake, and differential scanning calorimetry. It is validated by studying for the first time the aging kinetics of silane cross-linked polyethylene (PEX) exposed to media used in oil and gas production and transportation, including aliphatic and aromatic hydrocarbons, sulphur solvents, and corrosion inhibitors in combination with CO2 and H2S. All investigated parameters changed, with the strongest effects detected for the NMR chain mobility and in the presence of hydrocarbons. Furthermore, a universal linear correlation curve could be established between the depression of the tensile strength and the chain mobility. This result represents a fundamental step towards establishing single-sided NMR as a new analytical tool for in situ condition monitoring of polyethylene working under sour conditions. The proposed approach can be easily extended to other polymer materials.

References

Jul 26, 2008·Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions·Giulio Guagliumi, Vasile Sirbu
Dec 24, 2013·Progress in Nuclear Magnetic Resonance Spectroscopy·J MitchellE J Fordham

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Citations

Dec 13, 2017·Angewandte Chemie·Bernhard Blümich, Kawarpal Singh
Mar 7, 2021·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Anton Duchowny, Alina Adams
Feb 6, 2018·Analytical Chemistry·Stefan SommerAlina Adams

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