Controlled synthesis of α,β-difunctional poly(hexafluoropropylene oxide)

An improved method is described for the preparation of difunctional poly(hexafluoropropylene oxide) of moderate molecular weight (M _n ≈ 6000) in good yield (>80 wt.-%). With the dependence of chain transfer constant on initiator concentration known, at least under controlled conditions, good molecular-weight control can be achieved.