PEO partitioning from water to CH2Cl2 and CHCl3 increases with its molar mass, leveling off at ca. 3 000 g mol-1. Such a behaviour is related to PEO end-group contributions, suggesting a polyglycol to polyether transition at ca. 3 000 g mol-1.
poly(ethylene glycol); poly(ethylene oxide); polymer partitioning; polymer fractionation; biphasic systems; end-group contribution