Abstract
For the purpose of verifying the validity of modern fractionation theory by experimentation, atactic polystyrene in methylcyclohexane was fractionated by employing a successive solutional fractionation (SSF) method. SSF was duplicated under different operating conditions. The fractions thus prepared and those in a previous paper (Makromol. Chem., 117, 485 (1976)) were eluted through a GPC column, whose resolution factor h was very accurately determined in advance. The experimental relations of the ratio of the weight- to number-average molecular weight Mw/Mn vs. Mw obtained for three SSF runs fit in well with those predicted by the theory with p=0.7, which was already evaluated by the phase-separation experiment on the same polymer/solvent system, where p is a parameter representing concentration dependence of the thermodynamic polymer/solvent interaction parameter χ given by χ=χ0(1+pvp) (χ0, constant and vp, polymer volume fraction).
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Kamide, K., Miyazaki, Y. & Abe, T. An Additional Test of Modern Theory of Molecular Weight Fractionation Based on Solubility Difference. Polym J 9, 395–403 (1977). https://doi.org/10.1295/polymj.9.395
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DOI: https://doi.org/10.1295/polymj.9.395