The Polymer Society of Korea

최소현 (인하대학교)

양회창 (인하대학교)

We investigate the solution crystallization behavior of semiconducting polymers in nanoconfinement generated by 1,3,5-trichlorobenzene (sym-TCB), a solvent additive that crystallizes at room-temperature. Polymer solutions of diketopyrrolopyrrole-bithiophene copolymer (pDPPBT) and poly(3-hexylthiophene)(P3HT) were prpared in chloroform with varying concentrations of sym-TCB. Upon film casting, sym-TCB crystals directed the growth of polymer domains, resulting in spherulitic morphologies replicated from the solvent crystals. pDPPBT films exhibited predominantly edge-on chain orientation at the dielectric interface, whereas P3HT showed bimodal orientation: face-on alignment near the top surface via epitaxial crystallization and edge-on alignment at the bottom interface. This crystallization behavior was also observed in other conjugated polymer systems.