Cationic comb polymer superdispersants for colloidal silica suspensions.
We investigate the ability of a cationic comb polymer composed of a poly(trimethylammonium iodide ethyl methacrylate) (PTMAM) backbone and uncharged poly(ethylene glycol) (PEG) teeth to stabilize aqueous silica suspensions of varying ionic strength and pH. Both PTMAM-g-PEG and its homopolymer backbone, PTMAM, are synthesized via reversible addition-fragmentation chain transfer followed by quaternization of the pendant amine groups with methyl iodide. Through a combination of polymer adsorption, zeta potential, and sedimentation measurements as well as confocal imaging of sediment structures, we find that PTMAM-g-PEG imparts stability over a broad range of solution conditions, where pure PTMAM fails.
Rhodes
Summer K
SK
Materials Science and Engineering Department, Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA.
Lambeth
Robert H
RH
Gonzales
Jaime
J
Moore
Jeffrey S
JS
Lewis
Jennifer A
JA
D000327:Adsorption; D002412:Cations; D003102:Colloids; D011108:Polymers / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*
D002412:Cations; D003102:Colloids; D011108:Polymers; D012822:Silicon Dioxide