| Abstract
| - Monodisperse polyampholyte latexes that contain 25/23 and 29/18 mol % of polystyrylmethyl(trimethyl)ammonium and methacrylate groups were prepared by emulsion polymerization of vinylbenzylchloride (VBC), tert-butyl methacrylate (tBMA), styrene, and divinylbenzene followed by stepwiseconversion of the VBC and tBMA to cations and anions, respectively. As NaCl is added to aqueousdispersions, the polyampholyte latexes shrink up to 0.5 M and then swell up to 5 M NaCl, in which theparticles are colloidally stable. The polyampholyte latexes also are colloidally stable in 1.2 M BaCl2 solution.In contrast, the precursor quaternary ammonium chloride polyelectrolyte latexes coagulate rapidly inNaCl and BaCl2 solutions.
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