title: Crystal structure of friction-transferred poly(2,5-dioctyloxy-1,4-phenylenevinylene).
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 polarized ultraviolet-visible (UV-vis) absorption spectroscopy, polarized photoluminescence (PL) spectroscopy, and synchrotron-sourced grazing incident X-ray diffraction (GIXD) analysis. The polarized UV-vis absorption and PL spectra indicate clear axial alignment. DOPPV backbones in friction-transferred film are highly aligned along the drawing direction of the friction-transfer. Further information of the molecular arrangement in friction-transferred DOPPV film was investigated by both the out-of-plane and the in-plane GIXD analyses with 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 chains lay in the film plane, and the planar backbones were arranged parallel to the film surface. Additionally, two neighboring DOPPV molecules along the direction of inter-backbones separation by alkyl side chains were found to be shifted with respect to one another by the mean distance of half of a monomeric repeat.
authors.affiliation: Photonics Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Japan. nagamatu@cse.kyutech.ac.jp
authors.forename: Shuichi
authors.initials: S
authors.lastname: Nagamatsu
authors.forename: Masahiro
authors.initials: M
authors.lastname: Misaki
authors.forename: Masayuki
authors.initials: M
authors.lastname: Chikamatsu
authors.forename: Tatsumi
authors.initials: T
authors.lastname: Kimura
authors.forename: Yuji
authors.initials: Y
authors.lastname: Yoshida
authors.forename: Reiko
authors.initials: R
authors.lastname: Azumi
authors.forename: Nobutaka
authors.initials: N
authors.lastname: Tanigaki
authors.forename: Kiyoshi
authors.initials: K
authors.lastname: Yase