Date Thesis Awarded
5-2016
Access Type
Honors Thesis -- Access Restricted On-Campus Only
Degree Name
Bachelors of Science (BS)
Department
Chemistry
Advisor
Tyler Meldrum
Committee Members
Kristin Wustholz
John Poutsma
Micheal Kelley
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.
Recommended Citation
Morin, Frances Jude, "Studies of the development of intermolecular networks during the curing of coatings using single-sided nuclear magnetic resonance" (2016). Undergraduate Honors Theses. William & Mary. Paper 924.
https://scholarworks.wm.edu/honorstheses/924
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