INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
SEQUENCED TWO-DIMENSIONAL LIQUID CHROMATOGRAPHY: MOLAR MASS DISTRIBUTION IN A BINARY POLYMER BLEND
Autor/es:
CLEMENTI, LUIS A.; VEGA, JORGE R.; SISKOVA, ALENA; MEIRA, GREGORIO R.; BEREK, DUSAN
Lugar:
Ljubljana
Reunión:
Simposio; 21st International Symposium on Separation Sciences; 2015
Institución organizadora:
National Institute of Chemistry
Resumen:
Sequenced two-dimensional liquid chromatography (S2D-LC) can be employed for estimating the molar mass distribution (MMD) of each component in binary polymer blends. In the first column, the 2 polymer components are isolated from each other by liquid chromatography at limiting condition of desorption (LC-LCD), induced by injecting a properly-chosen solvent barrier for the selective deceleration of the more adsorbing component. Then, the isolated peaks are forwarded into a size exclusion chromatography (SEC) column for evaluation of the individual MMDs by means of an evaporative LS concentration detector [1,2]. Data treatment in S2D-LC + SEC systems is complex because: i) the polymer component that remains unaffected by the barrier in the first column suffers however for band broadening and other possible fractionation effects; and ii) molar masses are typically estimated on the basis of individual molar mass calibrations specific to the second SEC column.For blends of polystyrene (PS) and poly methyl methacrylate (PMMA), the following calibrations were determined after injection of their narrow standards: i) for the isolated LC-LCD and SEC columns; and ii) for the series of LC-LCD + SEC columns, with and without injection of barrier. From the mentioned information, a data treatment procedure is proposed for estimating the MMD of each polymer component in any PS-PMMA blend.