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Studies of the development of intermolecular networks during the curing of coatings using single-sided nuclear magnetic resonance
Morin, Frances Jude
Morin, Frances Jude
Abstract
In recent years, the development and accessibility of UV-cured coatings have made them a focus of polymer studies. UV-cured coatings provide a variety of benefits over traditional air-drying coatings. UV-coatings have been studied fairly extensively but many of the techniques used to track curing are destructive. Single-sided nuclear magnetic resonance (NMR) provides an alternative, non-invasive and non-destructive technique for these curing studies. The cross-linking in the coating poly(ethylene glycol) diacrylate (PEGDA) was monitored through two measurements, T2 relaxation and Multiple-Quantum Coherences. These two NMR experiments will provide a picture of the level of molecular network formation during the curing process. T2 relaxation measurements are frequently used to track cross-linking and provide a reliable look at the rigidity of the intermolecular network. Multiple-Quantum Coherences have been used to probe residual dipolar couplings, which are indicative of local orientation and cross-linking. The quantitative cross-linking and local orientation gathered from these experiments can be used to draw conclusions about strength and completeness of the intermolecular networks formed. Cross-checking the results between these two fundamentally different measurements creates a realistic picture of the formation of intermolecular networks in the PEGDA coating.
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2016-05-01
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Chemistry