Copolymers of Acrylamide and a Novel Sulfobetaine Amphoteric Monomer

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Polymers and High Performance Materials


The free radical copolymerization of acrylamide (AM) with 3-(2-acrylamido-2-methylpropyldimethylammonio)-1-propanesulfonate (AMPDAPS) has been studied in the range from 25 to 90% AM in the feed. The value of r1r2 has been determined to be 0.60 for the AM-AMPDAPS pair. The copolymer compositions have been determined from elemental analysis and C-13 NMR. Molecular weights were determined using LALIS and were found to vary from 1.7 to 10.2 x 10(6)g/mol. The copolymer microstructures, including run numbers and sequence distributions, were calculated from the reactivity ratios. The solution properties of the AM-AMPDAPS copolymers, as well as the AMPDAPS homopolymer, have been studied as a function of composition, pH, and added electrolytes. The solutions of these polymers shown increased intrinsic viscosities in the presence of sodium chloride and/or calcium chloride. The solution behavior of the homopolymer of AMPDAPS is independent of pH. The observed properties are consistent with the charge density of the polymers and the sulfobetaine structure of the AMPDAPS monomer.

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ACS Symposium Series



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