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- W2010078601 abstract "Light scattering and refraction measurements are performed and/or analysed for several polystyrenes and a poly(methyl methacrylate) diluted in various solvents. Contrary to the case of standard polystyrenes in toluene, previously studied, strong deviations occur between the molecular weight values obtained through the classical method Mw(C), through the new proposed method Mw(N), and the expected values Mw (deduced from adequate solutions). In mixtures with large difference between the polymer and solvent refractive indices (for the index increment dn/dc>0.05 cm3 g−1; n, refractive index, c, the concentration): the variation range of Mw(C)/Mw(N) is from about 0.2 to 5. In mixtures with low indices differences, Mw(C)/Mw(N) is systematically strong and even tends to ∞ for dn/dc=0, with Mw(C) tending to ∞, Mw(N) having always reasonable limited values. The variation range of Mw(C)/Mw is also infinite (for dn/dc tending to 0), while it remains realistic for Mw(N)/Mw. Three cases are observed for the values obtained by the new method. In a “good” solvent, Mw(N)∼Mw, in a “bad” solvent, either Mw(N)>Mw or Mw(N)<Mw. The second case can be easily explained by solute aggregates but the third case is more complicated to explain. Eventually, in spite of some necessary progress in understanding the phenomena, the practical prevalence of the new method seems unambiguous." @default.
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- W2010078601 date "1999-03-01" @default.
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- W2010078601 title "Molecular weights by light scattering in macromolecules solutions. Large deviations observed between a new method and the classical method" @default.
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- W2010078601 doi "https://doi.org/10.1016/s0022-2860(98)00614-0" @default.
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