polymer Yield The A-pEtEtOx-A and A-pPrMeOx-A series were also characterized with XRD. No crystalline peaks were observed in diffractograms (Fig. ), confirming the amorphous character of all A-pEtEtOx-A and A-pPrMeOx-A series polymers. The chiroptical properties of the triblock copolymers were also investigated by CD in methanol (0.1 g/L) at 25 °C (Fig. and). Clearly, the CD spectra of chiral triblock copolymers show a pronounced CE. The optically inactive pMeOx blocks do not prevent the secondary structures induced by the chiral block. In addition, the CE of chiral triblock copolymers in CD also retains in aqueous solution at 25 °C and 50 °C (Fig. ). In contrast, as expected the racemic triblock copolymers and the 1/1 (w/w) mixtures of two corresponding chiral triblock copolymers did not show CE either in methanol or aqueous solution.