| 초록 |
The molecular weights and chain-rigidities of block copolymers can strongly influence their self-assembly behavior, particularly when the block copolymers are under confinement. We investigate the self-assembly of bottlebrush block copolymers (BBCPs) confined in evaporative emulsions; a series of symmetric BBCPs were used, where polystyrene (PS) and polylactide (PLA) side-chains are grafted onto the polynorbornene (PNB) backbone, are synthesized with different degrees of polymerization of the PNB (NPNB). Morphological transitions from onion-like particles into ellipsoids occur as the NPNB of the BBCP increases, which is also predicted from simulations of BBCP droplets by an implicit solvent model. Furthermore, we investigated the morphological evolutions of BBCP particles. Compared to onion-like particles, ellipsoids exhibit the unique axial development of ring-like lamellae domains on the particle surface, followed by the radial propagation into the particle center. Finally, the shape-anisotropies of the ellipsoidal BBCP particles are analyzed as a function of particle size. |
