AbstractEquilibrium sorption of water vapor by oligomeric block copolymers (PEP) of ethylene and propylene oxides was measured at 23°C at five values of the relative vapor pressure, 0.32 ≦p/p0≦ 0.90. Sorption isotherms were described by a simple empirical two‐parameter equation. The effect of the copolymer composition on the parameters was established. The Lundberg‐Zimm clustering function, the mean size of clusters of water molecules, and the Flory‐Huggins interaction parameters were estimated. Their dependencies on copolymer composition and water content in the system are
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