| 초록 |
In this presentation, we reported syntheses, morphologies and crystallinity as well as photophysical properties of series of coil-rod-coil triblock copolymers and rod-coil diblock copolymers containing highly regioregular poly(3-hexylthiophene) (P3HT) as the rod block. An effective method to synthesize well-defined block copolymers based on the coupling reaction between living polymeric anions (polystyrene, polyisoprene and poly(methyl methacrylate)) and aldehyde terminated P3HT was developed, and which was demonstrated to afford block copolymers with accurate control molecular weights and compositions as well as low polydispersities. The chemical structure, the molecular weight of the non-P3HT coil segments as well as the architecture of the block copolymers (diblock or triblock) were found to exhibit noticeable effects on the morphologies and the crystallinity of P3HT domains, and thus affecting photophysical properties. By introducing suitable coil segments with designated molecular weights, one could manipulate the morphology and crytallinity of the P3HT block copolymers through various processing conditions, which further extend the applicability of these block copolymers. Here we report two interesting P3HT block copolymer systems with detail investigations. When poly(isoprene) (PI in 1,4-addition) was incorporated, the resulting P3HT-PI block copolymers could be rubbery or gel-like, depending on the compositions of the block copolymers. The rubbery and gel properties would enable the feasibility of shear alignment to enhance the long range order and the orientation of the resulting morphologies. It was found that the organization and the crystallinity of these P3HT block copolymers could be simultaneously enhanced to possibly improve the performance of the polymer solar cells and the field effective transistors. When alcohol containing coil segments was introduced, the resulting P3HT-poly(alcohol) block copolymers became amphiphilic and the color of the solutions could be tuned by different solvent combinations. The amphiphilicity would facilitate the morphology control by solvent effect and substrate effect. It was also found that the hydrogen bonding of poly(alcohols) would play an important role in determining the morphology and the crystallinity of the block copolymers. |
