| Abstract
| - Poly(2,5-dioctyloxy-1,4-phenylenevinylene) (DOPPV) was found to form a highly oriented film by a friction-transfer technique. Structural investigation of friction-transferred DOPPV was studied by means of polarizedultraviolet−visible (UV−vis) absorption spectroscopy, polarized photoluminescence (PL) spectroscopy, andsynchrotron-sourced grazing incident X-ray diffraction (GIXD) analysis. The polarized UV−vis absorptionand PL spectra indicate clear axial alignment. DOPPV backbones in friction-transferred film are highly alignedalong the drawing direction of the friction-transfer. Further information of the molecular arrangement infriction-transferred DOPPV film was investigated by both the out-of-plane and the in-plane GIXD analyseswith synchrotron source. The DOPPV molecules in friction-transferred films were perfectly arranged three-dimensionally: the backbones aligned along the drawing direction of friction-transfer, the alkyl side chainslay in the film plane, and the planar backbones were arranged parallel to the film surface. Additionally, twoneighboring DOPPV molecules along the direction of inter-backbones separation by alkyl side chains werefound to be shifted with respect to one another by the mean distance of half of a monomeric repeat.
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