Date Thesis Awarded

5-2016

Document Type

Honors Thesis

Degree Name

Bachelors of Science (BS)

Department

Chemistry

Advisor

Tyler Meldrum

Committee Member

Kristin Wustholz

Committee Member

John Poutsma

Committee Member

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.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

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