Transition of Solution Assembly Behaviors from Nanowires to Micelles Using Regioregularity-Controlled P3HT-<EM>b</EM>-P2VP Block Copolymers
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초록
내용
In selective solvents, poly(3-hexylthiophene) (P3HT)-based block copolymers (BCPs) assemble into crystallized nanowire (NW) structures due to rigid P3HT blocks. Herein, we report the effect of the crystalline interactions of P3HT block on the self-assembled structure of P3HT-block-poly(2-vinylpyridine) copolymers in solvent by tuning the regioregularities (RRs) of P3HT. We synthesized a series of BCPs that had the same molecular weights but various RRs, ranging from 55 to 95%, and investigate their behavior in a binary solvent mixture. The well-defined NW structures were produced from BCP with high RR (95%). As decreasing RR, more flexible P3HT chains produced gradual increases in the width of NWs, from 12 to 24 nm. A morphological transition to spherical micelle structures was observed at 55% RR. The structural differences were visualized by incorporating Au nanoparticles, which locate at the interface of P3HT and P2VP blocks, onto NWs and imaging the resulting hybrid nanostructures.