Photoinduced Crosslinking of Distyrylbenzene Containing Blockcopolymers for Manufacture of New Photoalignment Layers
BOWLING GREEN STATE UNIV OH CENTER FORPHOTOCHEMICAL SCIENCES
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1 Photooriented polymer films have received increased interest for the alignment of liquid crystals 2 Photoalignment layers obtained by photochemical reactions reduce the disadvantages, i.e., dust formation and static electricity build up during the rubbing process, of commercially used rubbed polyimide films. 3 Particularly surface effects are crucial for the alignment of liquid crystals controlled by photoactive polymeric films. 4 Azobenzene, coumarin and cinnamate containing polymers have been already investigated in detail 5 In the case of azobenzene chromophore containing polymers trans-cis photoisomerization is significant for photoorientation 6 Crosslinked polymer films oriented by irradiation of main chain polymers with linearly polarized light possess an increased stability in comparison with non-crosslinked polymer films 7 The polymers investigated in this work are main chain polymers, which contain the distyrylbenzene chromophore and a flexible aliphatic chain 8 Trans-cis photoisomerization and 22 photocycloaddition can competitively occur during irradiation of the photochromic main chain polymers even in the glassy state 9 The new fluorine containing photoactive polymers 1 and 2, which contain the distyrylbenzene chromophore within the main chain, have been investigated in comparison with the photoactive polymer 3, which possesses a similar chemical structure and 10 The capability of the photoalignment layer in order to align a liquid crystal was investigated as a function of both surface topography and photoinduced dichroism of the photoalignment layer.
- Organic Chemistry
- Polymer Chemistry