Aqueous solution properties of poly[3‐dimethyl (methacryloyloxyethyl) ammonium propane sulfonate]

Abstract

Abstract The aqueous solution properties of an ampholytic poly[3‐dimethyl (methacryloyloxyethyl) ammonium propane sulfonate] [poly(DMAPS)] are studied by measurements of cloud point determination, intrinsic viscosity, degree of binding, and ionic strength. The minimum salt concentration and intrinsic viscosity of this polyampholyte are related to the type and concentration of added salt. Both the polymeric and monomeric betaines in the presence of NaCl have the lower degree of binding, indicating that the proton ion (H + ) is relatively difficult to bind the SO − 3 at the end of sulfobetaine. An increase in ionic strength causes the pK a to decrease at the half‐neutralization point.