Copolymers of Acrylamide and a Novel Sulfobetaine Amphoteric Monomer

Document Type

Article

Publication Date

1991

Department

Polymers and High Performance Materials

Abstract

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 13C NMR. Molecular weights were determined using LALLS and were found to vary from 1.7 to 10.2 x 106g/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 show 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.

Publication Title

ACS Symposium Series

Volume

467

First Page

119

Last Page

129

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