Development of liquid-crystalline polymer semiconductors having elastomeric properties

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In this study, liquid crystalline semiconductors based on perylene tetracarboxylic bisimide (PTCBI) cores have been studied. PTCBI derivatives bearing four alkenyl groups were synthesized and oligosiloxane chains were introduced at the terminals of the side chains using Karstedt catalyst. These compounds exhibit columnar phases at room temperature and do not crystallize even when they are cooled to -100 oC. They exhibit high electron mobilities in the columnar phases at room temperature and the electron mobility exceeds 0.1 cm2/Vs in ordered columnar phase of a compound. These compounds are soluble in various organic solvents except for alcohols. Thin films can be produced on glass substrates by a spin-coating method. Using friction transfer method, uniaxyally aligned thin films can be produced. LC PTCBI derivatives bearing polymerizable cyclotetrasiloxane moieties have been synthesized. The compound in which the cyclotetrasiloxane moieties are connected to the core via hexylene groups exhibits a disordered columnar phase at room temperature and the electron mobility is determined to be 2x10-4cm2/Vs at room temperature by the time -of-flight method. The compound is also soluble in various organic solvents and thin film can be produced by the spin-coating method. The compound polymerizes in the presence of trifluoromethane sulfonic acid. Now the polymerization condition is being investigated.