Effect of the polydispersity on the dispersion of polymers through silicas having different morphologies (fully porous and core-shell particles and monoliths)

The effect of the polydispersity polystyrenes on dispersion through silicas having different morphologies (fully porous, core-shell particles and monoliths) was investigated. heights equivalent to a theoretical plate (HETP) those columns were measured for small molecule (toluene) series sizes in non-adsorbing conditions. contributions total HETP including determined experimentally. longitudinal diffusion mass transfer resistance term obtained from peak parking experiments. eddy models values (Hpoly) can thus be calculated by substraction other contributions. results compared Knox model which surestimates Hpoly porous is usually explained an overestimation index (PDI) given manufacturer. PDI two polymers (P02, Mw= 690 g.mol−1 P03, Mw=1380 g.mol−1) verified liquid chromatography separating each fraction polymer silica using adsorbing conditions are with mixture heptane THF. comparable manufacturer meaning that assumptions made not entirely valid. A direct method proposed this paper order determine Hpoly. In excess spreading as only one size corresponding average studied assuming distribution gaussian. experimental values.