Abstract
In this paper, the effect of different additives on the solubility and intrinsic viscosity [η] of ethylene oxide-propylene oxide statistical copolymers in water is studied. In the case of mineral additives, the order of ‘salting out’ is the same as for ethylene oxide homopolymer. If one excepts the case of sodium iodide, the variations of the viscosimetric expansion can be plotted on the same curve as a function of reduced temperature for different salts. Organic additives have an increasing or decreasing effect on the lower critical temperature ( LCST′) of the copolymers according to their polarity. The relation between the variations of [η] and LCST′ is much more complex than for mineral additives since [η] at a given temperature depends on the free energy of mixing of the two solvents.
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