SOLID-STATE NMR STUDIES ON THE POLYMER GLASS INTERFACE
Open Access
- Author:
- Suchy, Daniel L
- Graduate Program:
- Chemistry
- Degree:
- Master of Science
- Document Type:
- Master Thesis
- Date of Defense:
- June 24, 2010
- Committee Members:
- Karl Todd Mueller, Thesis Advisor/Co-Advisor
Karl Todd Mueller, Thesis Advisor/Co-Advisor - Keywords:
- Glass
Solid-State NMR
Polymers - Abstract:
- Although coatings have been applied to glass compositions for centuries, the reactive sites present on the glass surface and their roles in binding different chemical species require investigation so that materials can be tailored to meet specific demands. Here, the binding of small molecules to silica and boroaluminosilicate glass are investigated for the purpose of improving coatings used in industrial building materials through a better understanding of the oxide surface reactivity. Application of acetic acid and acetyl chloride probe molecules onto oxide surfaces have been used to investigate the different binding sites present at the oxide interface. In order to probe the glass polymer interface, solid-state magic angle spinning (MAS) nuclear magnetic resonance (NMR) and temperature programmed desorption inverse gas chromatography (TPD-IGC) are utilized. Two distinct desorption regimes in the TPD-IGC signify varying binding strengths, which supports the hypothesis that physical and chemical absorptions are occurring on both the silica and boroaluminosilicate glass surfaces. 1H-13C cross-polarization (CP) MAS NMR studies of the species present at the silica surface after dosing with either acetic acid or acetyl chloride indicate the chemisorbed species to be a silyl-ester. In contrast, when 1H-13C CP MAS NMR is used to analyze the boroaluminosilicate glass that had been dosed with acetic acid or acetyl chloride, the data indicates that the chemisorbed species is due to the formation of sodium carboxylate on the glass surface. Collaboratory Diffuse Reflection Fourier Transform Infrared Spectrometry (DRIFTS) data further verifies the formation of the silyl-ester and sodium carboxylate species.