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- W2005677007 abstract "The partitioning of poly(ethylene glycols), PEGS, in supercritical CO2 is presented. The individual n-mer partition coefficients are determined from the overall polymer compositions, treasured by UV-absorption spectroscopy and the polymer molecular-weight distributions measured by FAB mass spec troscopy in two coexisting phases. The results of two parent PEGs, one with an average molecular weight of 400 and n-mer range of 4 to 16, and a second with an average molecular weight of 600 and n-mer range of 4 to 21, are reported at various temperatures and pressures. The molecular-weight dependence of n-mer partition coefficients follows Flory's expression for n-mers with molecular NA cights above ≈400 and deviates from the expected behavior for n-mers in the lower molecular-weight range. The observed deviation is attributed to the hydroxyl end groups effects and the resulting intramelecular associations. A critical molecular weight of ≈400 corresponds to the maximum range of these intramolecular associations. The effects of the operating conditions on the yield and the selectivity of supercritical-fluid fractionation of PEGs are also discussed." @default.
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- W2005677007 date "1992-06-01" @default.
- W2005677007 modified "2023-10-16" @default.
- W2005677007 title "Supercritical-fluid fractionation of poly(ethylene glycols)" @default.
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- W2005677007 doi "https://doi.org/10.1016/0896-8446(92)90031-e" @default.
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