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- W2021339372 abstract "A study was made of the gradient eluton behaviour of the high-molecular-weight polystyrenes on C18 reversed-phase columns in methanol—dichloromethane solvent systems. The polymers were injected into mobile phase compositions which were expected to precipitate the polymer on the column and separation of the polymers was then expected as solvents able to dissolve the various molecular weights entered the column in the solvent gradient. The effects of column pore size, sample load and flow-rate were examined. Results were determined mainly by polymer molecular weight and its relation to column pore size. When columns were chosen in which polymer had access to the pores, elution occured after the expected solvent solubility composition indicating that normal adsorption processes were occuring. Polymers which were excluded from the pores underwent unusual elution process which resulted in their elution at the solvent solubility composition, or before. The extent of this unexpected elution in a solvent of poorer solvating ability was more predominant on columns of small pore size. The effects of these elution processes was to contribute to band broadening and to reduce selectivity between higher-molecular-weight polymers on small pore size adsorbents. An explanation as to the causes of such elution processes is presented, in which non-equilibrium solvation precipitation of eluting polymer molecules occurs in the changing solvent gradient mixture." @default.
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- W2021339372 date "1991-01-01" @default.
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- W2021339372 title "Reversed-phase gradient elution behaviour of polystyrene in a dichloromethane—methanol solvent system" @default.
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- W2021339372 doi "https://doi.org/10.1016/s0021-9673(01)95764-4" @default.
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