The effect of blob size and network dynamics on the size-based separation of polystyrenesulfonates by capillary electrophoresis in the presence of entangled polymer solutions

摘要: This work focuses on the separation of standard polystyrenesulfonates (PSS), with molecular masses (Mr) between 16 and 990 x 10(3) in capillaries filled semidilute (entangled) linear hydrophilic polymers. Contrary to cross-linked chemical gels, which produce permanent networks, solutions polymers lead dynamic networks. The analytical performances migration mechanisms are discussed basis experiments performed polyethyleneoxides derivatized celluloses various masses. influence mesh size lifetime obstacles separating network has been investigated detail. is assimilated blob polymer a decreasing function its concentration. network, identified reptation time chain, characterizes dynamics. characteristic increases both weight Its impact was first examined at fixed size. Then, studied while keeping constant. By doing so, existence interactions solute or capillary wall can be more safely assessed. It appears that large electrophoretic mobility PSSs under threshold value, order magnitude taken by PSS migrate Also shown separations using networks made up mixtures same nature mass concentration, but very different latter approach allows one adapt viscosity solution dynamics