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Amphiphilic triblock terpolymers, poly(n-hexyl isocyanate)-b-poly(ethylene glycol)-b-poly(n-hexyl isocyanate) (defined as PHIC-b-PEG-b-PHIC) was synthesized by using CpTiCl2-PEG-CpTiCl2 as macromolecular initiator.GPC, FT-IR, 1H NMR and DSC analyses confirmed the formation of amphiphilic block terpolymers.UV-vis spectra demonstrated that the PHIC block in the triblock terpolymers adopted helical structures.