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Control and Suppression of Surface Relief Gratings in Liquid‐Crystalline Perfluoroalkyl–Azobenzene Polymers
Author(s) -
You F.,
Paik M. Y.,
Häckel M.,
Kador L.,
Kropp D.,
Schmidt H.W.,
Ober C. K.
Publication year - 2006
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200500711
Subject(s) - azobenzene , polymer , materials science , side chain , liquid crystalline , azo compound , liquid crystal , polymer chemistry , chemical engineering , photochemistry , optoelectronics , composite material , chemistry , engineering
Semifluorinated azobenzene liquid‐crystalline side‐chain polymers with different perfluoroalkyl lengths are used to develop surface relief gratings (SRGs). With sufficient fluorinated side‐chain lengths, surface relief gratings could be completely suppressed due to the self‐assembled liquid‐crystalline order at the surface. This indicates that there is a surface‐dependent nature to SRG formation. The SRG formation from the semifluorinated azobenzene liquid‐crystalline side‐chain polymers is compared to methoxy‐terminated azobenzene side‐chain polymers, and results show that the perfluoroalkyl–azobenzene polymers require a longer formation time than the methoxy‐terminated polymers.