Study of Forming Well-Ordered Nanostructures in P3DDT-b-PLA Thin Film Via Solvo-Microwave Annealing
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Conjugated polymer-based block copolymers (BCPs) have attracted a great attention for their potential in manufacturing nanoscale organic conducting pathways. Herein, fabrication strategies of well-defined organic conducting pathway using BCP self-assembly followed by solution etching are demonstrated. A series of poly(3-dodecylthiophene)-block-poly(l-lactic acid) [P3DDT-b-PLLA] that contains conjugated block (P3DDT) and removable coil block (PLA) were synthesized. Afterward, we successfully assembled P3DDT-b-PLA into well-ordered lamellar and cylinders with good crystallinity using a solvo-microwave annealing technique. Forming well-ordered nanostructures maintaining strong crystallinity of conjugated polymer is achieved by applying thermal annealing effects and solvent annealing effects. Further selective removal of PLA block in thin films using sodium hydroxide (NaOH) solution, followed by a DI-water/MeOH co-solvent washing resulted in well-defined organic conducting pathway.