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The sedimentation and diffusion of sodium polymethacrylate and polymethacrylic acid

1954; Wiley; Volume: 12; Issue: 1 Linguagem: Inglês

10.1002/pol.1954.120120117

1542-6238

G. J. Howard, D. O. Jordan,

Polymer Science and PVC

Abstract The sedimentation constants and diffusion coefficients of sodium polymethacrylate and of polymethacrylic acid have been determined at various concentrations of polymer and of added electrolyte and the nature of the charge effects is considered. A ratio y = (molarity of added electrolyte)/(grundmolarity of polymer) is used to obtain S 20 at y = ∞ when the polyelectrolyte is assumed to be uncharged. The variation of the effective radius with y is considered not to be due to asymmetry but to the open network nature of the polyelectrolyte coil. The sedimentation constant of unionized polymethacrylic acid is determined and also the variation of sedimentation constant with degree of ionization.