電気光学デバイスへの応用を目指したボトムアップによるナノスケール材料の調製

概要

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Rod-coil amphiphilic diblock copolymers consisting of oligo(2,5-di-n-octyloxy-1,4-phenylenevinylene)(OPV) as a rod and a hydrophobic block, and poly(ethylene oxide) (PEO) as a coil and a hydrophilic blockwere synthesized by a convergent method. The aggregation behavior of the block copolymers in aselective solvent (THF / H2O) was probed by utilizing the absorption and the emission of the OPV block.With increasing H2O content, the absorption maximum was blue-shifted, the emission from themolecularly dissolved OPV decreased, and that from the aggregated OPV increased. The transmissionelectron microscopy observation revealed that the block copolymers with the PEO weight fractions of 41and 62 wt% formed cylindrical aggregate with a diameter of 6-8 nm and a length of several hundredsnanometer, while, the block copolymer with 79 wt% of PEO fraction formed distorted spherical aggregateswith an average diameter of 13 nm.
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