Methods of investigation theory of chromatographic separation of two-block copolymers according to composition

Critical retention behaviour of polymers a study on the influence of some practical parameters

“…From this result it can be concluded that K a is independent of pore size which is also in agreement with theoretical expectations [23,24].…”

“…For each investigated system, it was observed that no conditions could be found at which retention times of different polystyrene standards exactly match as is predicted by the theory of Skvortsov and Gorbunov [23,24]. An example of this observation is given in Fig.…”

“…Further studies on the chromatographic behaviour of other types of polymers under near-critical conditions may indicate whether our observations hold more generally, thus necessitating adaptation of the current theories [23,24] on critical conditions.…”

“…Based on his approach, Gorbunov and Skvortsov developed a model to describe the behaviour of macromolecules on porous adsorbents [23,24].…”

“…Separation with respect to functionality can become very complicated due to this effect, because excessive broadening effects can easily cause zones to overlap, due to different functionalities. Because the theories on critical conditions [23,24] have been derived from thermodynamics, and thus only are able to predict peak maxima, peak broadening due to kinetic effects is not taken into account. Extension of these theories as to include also kinetic effects can provide more insight in the possibilities and limitations of chromatography under critical conditions.…”