Jul, 2017
Photoalignment of Vertically Oriented Microphase Separated Lamellae in LC-LC Diblock Copolymer Thin Film
MACROMOLECULAR RAPID COMMUNICATIONS
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- 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
- ID information
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- DOI : 10.1002/marc.201600659
- ISSN : 1022-1336
- eISSN : 1521-3927
- Web of Science ID : WOS:000404894600010