Self-assembly Behavior of Poly(3-alkylthiophene)-\textit{block}-poly(methyl methacrylate) Block Copolymers Prepared by Anionic Coupling Reaction

We synthesized rod-coil block copolymers composed of regioregular poly(3-alkylthiopene) (P3AT) and poly(methyl methacrylate) (PMMA) via anionic coupling reaction. For poly(3-hexylthiopene)-b-PMMA, the morphology was mainly determined by self-crystallization of P3HT moieties due to strong rod-rod interaction. On the other hand, poly(3-dedecyl thiophene) (P3DDT)-b-PMMA, the self-crystallization was effectively suppressed. Detail phase behaviors were investigated at temperatures higher melting point (T$_{m})$ of P3DDT using small-angle x-ray scattering (SAXS), wide-angle x-ray scattering (WAXS) and transmission electron microscopy (TEM).