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Magnetochemistry 2018, 4(1), 8; https://doi.org/10.3390/magnetochemistry4010008

Spatially Resolved Measurements of Crosslinking in UV-Curable Coatings Using Single-Sided NMR

1
Department of Chemistry, The College of William & Mary, Williamsburg, VA 23185, USA
2
Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, USA
*
Author to whom correspondence should be addressed.
Received: 21 November 2017 / Revised: 18 December 2017 / Accepted: 22 December 2017 / Published: 9 January 2018
(This article belongs to the Special Issue Nuclear Magnetic Resonance Spectroscopy)
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Abstract

The UV-driven photocuring of coatings results in a crosslinked polymeric network. The degree of crosslinking in these coatings is typically assessed via optical spectroscopy; unfortunately, optical methods are typically limited in their maximum depth access. Alternatively, single-sided nuclear magnetic resonance (NMR) can be used to probe the crosslinking of UV-curable coatings in a spatially sensitive manner. Relaxation measurements, which correlate with crosslinking, can be done with a spatial resolution on the order of microns throughout the depth dimension of the coating, regardless of optical transparency of the material. These results can be visualized via a relaxation cross-section that shows the depth at which a particular relaxation value is observed. These measurements are used to probe the effect of a scavenger molecule that is added to the coating mixture, allowing for efficient crosslinking despite the presence of atmospheric oxygen. This method may find purchase in evaluating systems whose crosslinking properties are intentionally varied throughout its thickness; using NMR, these systems, up to approximately one hundred microns thick, can be measured without repositioning or rastering. View Full-Text
Keywords: NMR; coatings; single-sided; crosslinking; photocuring NMR; coatings; single-sided; crosslinking; photocuring
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Brass, M.; Morin, F.; Meldrum, T. Spatially Resolved Measurements of Crosslinking in UV-Curable Coatings Using Single-Sided NMR. Magnetochemistry 2018, 4, 8.

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