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J. Sens. Sens. Syst., 7, 21-30, 2018
https://doi.org/10.5194/jsss-7-21-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Regular research article
24 Jan 2018
Single-sided NMR for the measurement of the degree of cross-linking and curing
Norbert Halmen, Christoph Kugler, Eduard Kraus, Benjamin Baudrit, Thomas Hochrein, and Martin Bastian SKZ – German Plastics Center, Würzburg, 97076, Germany
Abstract. The degree of cross-linking and curing is one of the most important values concerning the quality of cross-linked polyethylene (PE-X) and the functionality of adhesives and resin-based components. Up to now, the measurement of this property has mostly been time-consuming and usually destructive. Within the shown work the feasibility of single-sided nuclear magnetic resonance (NMR) for the non-destructive determination of the degree of cross-linking and curing as process monitoring was investigated. First results indicate the possibility of distinguishing between PE-X samples with different degrees of cross-linking. The homogeneity of the samples and the curing kinetics of adhesives can also be monitored. The measurements show good agreement with reference tests (wet chemical analysis, differential scanning calorimetry, dielectric analysis). Furthermore, the influence of sample temperature on the characteristic relaxation times can be observed.

Citation: Halmen, N., Kugler, C., Kraus, E., Baudrit, B., Hochrein, T., and Bastian, M.: Single-sided NMR for the measurement of the degree of cross-linking and curing, J. Sens. Sens. Syst., 7, 21-30, https://doi.org/10.5194/jsss-7-21-2018, 2018.

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The degree of cross-linking and curing is an important value concerning the quality of cross-linked polyethylene (PE-X) and the functionality of adhesives and resin-based components. During this work the possibility of using single-sided NMR for the determination of this value in a non-destructive and much faster way than with the time-consuming standard laboratory measurements was shown. In addition, the usability of the measurement method for process quality control was investigated.
The degree of cross-linking and curing is an important value concerning the quality of...
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