Polyelectrolytes. XI. Electrophoresis in solutions of poly‐4‐vinyl‐N‐n‐butylpyridinium bromide

The following systems were observed in the Tiselius moving boundary apparatus: (1) poly‐4‐vinyl‐N‐n‐butylpyridinium bromide (PBr) with added potassium bromide/potassium bromide in osmotic equilibrium with the PBr‐KBr solution; (2) KBr/PBr, both solutions adjusted initially to the same conductance; (3) LiBr/PBr and (4) PBr‐(c1)/PBr(c2). Series 1 showed that the mobility of the polycation decreased with increasing KBr concentration. The schlieren patterns were strikingly asymmetric. Series 2 showed that the mobility of the polycation does not depend very much on molecular weight. Series 3 showed strong interaction between polyelectrolyte and simple electrolyte. Series 4 indicates that the mobility of the polycation depends on concentration much more than in the case of simple electrolytes. Both in Series 3 and 4, more moving boundaries appeared than are theoretically called for by the number of ionic species present.