| 초록 |
Polysilsesquioxane (POSS), an inorganic cage having an addressable functional group on each corner of the cube, has been widely used as well-defined molecular building blocks to construct nanoporous materials and block copolymers. We designed and synthesized a series of branched block copolymers PEG7-POSS-PS whose arms are precisely arranged on a T8 polyhedral oligomeric silsequioxane (POSS). The synthesis begins with POSS compound with one hydroxylethyl and seven vinyl pendant groups. Seven polyethylene glycol (PEG) arms are introduced to the vinyls through thiol-ene reaction, then the hydroxyl group is converted to alkyne for subsequent “grafting” of polystyrene (PS) arm onto POSS. By adjusting the molecular weight of polystyrene or composition of the solvent, a series of block copolymers PEG7-POSS-PS self-assemble into the desired structures, which range from vesicles to polymer sponges and polymer cubosomes. |
