One Methylene Group in the Side Chain Can Alter by
90 Degrees the Orientation of a Main-Chain Liquid Crystal on a Unidirectional
Substrate
Posted on 2018-03-23 - 18:43
The
mechanisms of orientation of columnar liquid crystals (LCs)
on a PTFE-rubbed surface are explored on a homologous series of symmetrically
substituted poly(di-n-alkylsiloxanes) (PDAS). It
is shown that by increasing the side-chain length in steps of one
CH2 group, the orientation of PDAS switches back and forth
from perpendicular to parallel with respect to PTFE chains. These
changes are sensitive to the smallest possible variation of the macromolecular
structure (i.e., modification of the side chain length by just one
CH2 group) reflect the alteration of the alignment mechanism
identified as graphoepitaxial or epitaxial for the perpendicular and
parallel orientation, respectively. The results show that two orthogonal
LC orientations are realizable on the same rubbed substrate, which
can open new perspectives in the field of organic and printed electronics
such as multidomain LCD technology.
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Odarchenko, Yaroslav; Defaux, Matthieu; Rosenthal, Martin; Akhkiamova, Azaliia; Bovsunovskaya, Polina; Melnikov, Alexey; et al. (2018). One Methylene Group in the Side Chain Can Alter by
90 Degrees the Orientation of a Main-Chain Liquid Crystal on a Unidirectional
Substrate. ACS Publications. Collection. https://doi.org/10.1021/acsmacrolett.8b00044
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AUTHORS (12)
YO
Yaroslav Odarchenko
MD
Matthieu Defaux
MR
Martin Rosenthal
AA
Azaliia Akhkiamova
PB
Polina Bovsunovskaya
AM
Alexey Melnikov
AR
Alexander Rodygin
AR
Andrey Rychkov
KG
Kirill Gerasimov
DA
Denis V. Anokhin
XZ
Xiaomin Zhu
DI
Dimitri A. Ivanov