Monitoring real-time curing of epoxies in situ using single-sided NMR |
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| Authors: | Mackenzie Kelley Nastaran Abdol Parviz Soroushian Kristina Keating Anagi M Balachandra Tyler Meldrum |
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| Institution: | 1. Department of Chemistry, William & Mary, Williamsburg, Virginia;2. Metna, Co., Lansing, Michigan;3. Department of Earth and Environmental Sciences, Rutgers University, Newark, New Jersey |
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| Abstract: | Adhesively bonded joints using epoxy are widely used in aircraft and aerospace structures. Quality control and defect detection during epoxy curing in such applications is critical. We used single-sided nuclear magnetic resonance (NMR) to nondestructively probe and spatially resolve the change in the characteristic NMR relaxation time (T2) of epoxies during curing on a substrate. Time-dependent T2 values were fit to a Weibull function to model temporal changes in the NMR measurables. Our results demonstrate that the reduction in molecular mobility of various epoxy/curing agent mixtures occurs more rapidly at the interface than in the bulk. Further use of single-sided NMR to acquire spatially resolved T2 data will provide a route for elucidatory epoxy curing studies. © 2020 Wiley Periodicals, Inc. J. Polym. Sci. 2020 , 58, 616–623 |
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| Keywords: | epoxy curing interfaces NMR relaxometry nondestructive single-sided NMR |
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