Solid state 19F MAS NMR studies of (3,3,3-trifluoropropyl) dimethylchlorosilane (TFS) probe molecules covalently bound to low surface area glass fibres are used for the quantitative analysis of hydroxyl sites on the surfaces of model E-glass fibres. The intensity of the 19F MAS NMR signal from the fluor mated TFS probe molecule reports on the total concentration of accessible hydroxyl units, while chemical shift and spin lattice relaxation rates are interpreted in terms of the surface morphology. Studies of a commercial aluminoboro-silicate microfibre and four model E-glass fibres are presented. Accessible hydroxyl coverages in the range of 0.50-1.44 OH/nm2 are measured and it is found that the presence of 1.8-5.5 mol% B2O3 reduces the surface hydroxyl concentration by a factor of two. The effect of the corresponding coordination of the boron species on the hydroxyl coverage and microporosity of the surface is discussed.
|Original language||English (US)|
|Number of pages||5|
|Journal||Physics and Chemistry of Glasses|
|State||Published - Apr 1 2003|
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Physical and Theoretical Chemistry