P1.2 - Determination of the Degree of Cross-linking and Curing with Single-sided NMR
- AMA Conferences 2017
2017-05-30 - 2017-06-01
- Proceedings Sensor 2017
- P1 - Materials and Technology
- N. Halmen, C. Kugler, T. Hochrein, P. Heidemeyer, M. Bastian - SKZ – German Plastics Center, Würzburg (Germany)
- 561 - 566
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. Up to now, the measurement of this property is mostly time-consuming and usually destructive. Within a research project the usability of single-sided NMR for the non-destructive determination of the degree of cross-linking and curing as process monitoring was observed. First results indicated the possibility to distinguish PE-X samples with different degrees of cross-linking. Also the homogeneity of the samples was studied. Furthermore 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). Also the influence of sample temperature on the characteristic relaxation times can be seen.