Mixing of ethylene oxide and propylene oxide oligomers: 2. Phase separation

Abstract

Equilibrium phase compositions and cloud point curves have been determined for mixtures of ethylene oxide and propylene oxide oligomers. Large differences in miscibility are noted between α,ω-hydroxy- and α,ω-methoxy-oligomers. The data for the α,ω-methoxy-oligomers are simply interpreted in terms of the Flory—Huggins equation with concentration dependent X, i.e. X = X 0 + X 1 ø 1 where ø 1 is the volume fraction of component 1. The approximate value of X for the α,ω-methoxy-oligomer mixtures is found to be 0.1.