摘要
This work aims to suggest a represented block copolymer (BCP) system, polystyrene-b-poly(l-lactide) (PS-PLLA), for examination of the phase behaviors of semiflexible-coil BCPs under different segregation strengths. Owing to the chiral polylactide with intrinsic chirality and semiflexible behavior, PS-PLLA can be referred to as a semiflexible-coil chiral block copolymer (BCP*), giving rise to a variety of self-assembled phases due to multiple effects of conformational asymmetry and rod-rod interaction as well as chirality on BCP self-assembly. With increasing segregation strength, conformational asymmetry and chirality effect lead to the formation and the enlarged forming window of the helical phase as PS being the major component. As PLLA becomes the major component, only the lamellar phase can be formed due to the rod-rod interaction. Interestingly, in the strong segregation region, the lamellar phase with out-of-phase undulation due to conformational asymmetry and in-phase undulation due to chirality effect (referred to as undulated lamellar phase) can be found.