Papers

Peer-reviewed
Jul, 2017

Photoalignment of Vertically Oriented Microphase Separated Lamellae in LC-LC Diblock Copolymer Thin Film

MACROMOLECULAR RAPID COMMUNICATIONS
  • Koichiro Beppu
  • ,
  • Yuki Nagashima
  • ,
  • Mituo Hara
  • ,
  • Shusaku Nagano
  • ,
  • Takahiro Seki

Volume
38
Number
13
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1002/marc.201600659
Publisher
WILEY-V C H VERLAG GMBH

The microphase separation and photoalignment behavior of a diblock copolymer consisting of two kinds of side chain liquid crystalline (LC) polymers are investigated. Here, the mesogens of photoresponsive azobenzene and non-photoresponsive cyanobiphenyl are introduced in the side chains. The azobenzene and cyanobiphenyl mesogens orient homeotropically and planarly, respectively, in a thin film state. The combination of these contrasting orienting properties leads to a formation of vertically oriented lamella in the microphase separation structure. Irradiation with linearly polarized light onto this polymer film induces a highly oriented microphase separation structure having regularly elongated stripe morphology with 30 nm periodicity. The nearly defect-free morphology of this LC-LC diblock copolymer after the photoalignment is a distinct feature when compared with those of coil (amorphous)-LC diblock copolymer films possessing the same azobenzene side chain.

Link information
DOI
https://doi.org/10.1002/marc.201600659
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000404894600010&DestApp=WOS_CPL
ID information
  • DOI : 10.1002/marc.201600659
  • ISSN : 1022-1336
  • eISSN : 1521-3927
  • Web of Science ID : WOS:000404894600010

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