Molar mass distribution in binary homopolymer blends by single-step two-dimensional liquid chromatography: Operation and data treatment
- Clementi, Luis Alberto
- Siskova, Alena
- Meira, Gregorio Raul
- Berek, Dusan
- Vega, Jorge Ruben
DOIAbstract
A single-step two-dimensional liquid chromatography technique is employed for estimating the individual molar mass distributions in blends of polystyrene and poly(methyl methacrylate). It involves an initial separation of the homopolymers by liquid chromatography under limiting condition of desorption (first column), followed by their fractionation by size exclusion chromatography (second Column). The technique requires a calibration stage with narrow standards for determining (for each homopolymer): a) the molar mass calibration of the complete fractionation system; and b) the band broadening function corresponding to the first column. Then, the molar mass distributions are estimated as Follows: i) the polymer blend is injected into the ta...
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