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Metal-free polymerization of ethylene oxide (EO) catalyzed by a relatively mild phosphazene base (t-BuP2) was proven feasible, which enabled the one-pot sequential polymerization of EO, ε-caprolactone, and L-lactide. Using either 3-phenyl-1-propanol or water as an initiator, the corresponding triblock or pentablock terpolymers were easily prepared.

Graphical abstract: Sequential polymerization of ethylene oxide, ε-caprolactone and l-lactide: a one-pot metal-free route to tri- and pentablock terpolymers

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