Bound carbonyls in adsorbed PMMA-r-PS copolymers
"The fraction of directly bound carbonyls from methyl methacrylate (MMA) groups adsorbed on silica was estimated using FTIR on adsorbed PMMA-r-PS copolymers. Due to the interaction of the carbonyl groups with the surface hydroxyl groups, a frequency shift for the hydrogen-bonded carbonyl stretch was observed. The ratio of the peak intensities of the free and bound carbonyls allowed the calculation of the bound fractions of carbonyls adsorbed on silica. These were found to vary from 0.1 to 0.46 for adsorbed amounts of 0.6 to 1.6 mg/m² for different compositions of PMMA-r-PS copolymers. The bound fraction of copolymer was found to be dependent primarily on the adsorbed amount. For the PMMA-r-PS copolymer adsorbed on silica, the fraction of bound carbonyls was found to be greater than in the PMMA-homopolymer adsorbed on silica. This was believed to be due to the limited numbers of carbonyls available for hydrogen bonding. The limited numbers of carbonyl groups available seem to find their way (on a fractional basis) to hydrogen bond to the surface silanols"--Abstract, leaf iv.
M.S. in Chemistry
University of Missouri--Rolla
Journal article titles appearing in thesis/dissertation
- Estimation of bound carbonyls in PMMA-r-PS copolymers adsorbed on silica using FTIR
xii, 88 leaves
© 2005 Pavan Kumar Challa, All rights reserved.
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Challa, Pavan K., "Bound carbonyls in adsorbed PMMA-r-PS copolymers" (2005). Masters Theses. 5838.
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