An Ft-ir Study of Calcium-exchanged Montmorillonite Treated With Polyethylene Oxide and Polyacrylamide.
SME Preprint 90-148 1990 :7 pages
The U.S. Bureau of Mines is using fourier-transform infrared (ft-ir) analysis to investigate the bonding mechanism that occurs during the dewatering of clay slurries. High-molecular-weight polymers are used as flocculating agents in these processes. This investigation presents the results of an ft-ir study of calcium-exchanged montmorillonite treated with polyacrylamide (pam) and polyethylene oxide (peo). Both thin-film and attenuated total reflectance spectroscopic techniques were employed to study this clay-polymer system. Results suggest pam is adsorbed to the clay via the nitrogen atom of the polymer. A water bridge is involved in the bonding between the clay and peo. Evidence also suggests that peo may be adsorbed directly onto the surface of the clay.
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