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Keywords:

  • Alignment;
  • Azobenzenes;
  • Polymers, liquid crystalline;
  • Self-assembly

Abstract

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.