2021
DOI: 10.3390/polym13020193 View full text |Buy / Rent full text
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Abstract: We provide experimental evidence for the influence of the molecular structure of the nematic liquid crystal (NLC) on the photoalignment process in three dimensions at the interface with a polymer layer. In particular, the experimental findings are explained through the presence (or absence) of the π−π aromatic interactions between the NLC and the polymer. The influence of the nematic-to-smectic A phase transition on the photocontrol is also addressed. Furthermore, we demonstrate that the photo-induced reorient… Show more

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“…The LC compounds with a biphenyl core were 4-cyano-4’-penthylbiphenyl (5CB), 4-cyano-4’-n-octylbiphenyl (8CB), 4-cyano-4’-n-octyloxybiphenyl (8OCB), 3,4,5-trifluoro-4’-(4-pentyl-cyclohexyl)biphenyl (5CPUF), as well as mixtures E7 and E63 (both from Merck). We note that the three fluorene atoms at 3,4,5 positions in 5CPUF almost “invert” the molecular electrostatic surface potential (MESP) [ 22 ] of the attached phenyl ring compared to the case of cyano-biphenyls (5CB, E7, E63) (as can be seen in [ 19 ]). LCs with phenylcyclohexane core were 1-(trans-4-hexylcyclohexyl)-4-isothiocyanatobenzene (6CHBT) [ 19 ] and some members of the PCH homologous series (PCH3, PCH5 and PCH7) [ 23 ], while LC with bicyclohexane core was the mixture ZLI1695 [ 23 ].…”
Section: Experimental and Materialsmentioning
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“…The LC compounds with a biphenyl core were 4-cyano-4’-penthylbiphenyl (5CB), 4-cyano-4’-n-octylbiphenyl (8CB), 4-cyano-4’-n-octyloxybiphenyl (8OCB), 3,4,5-trifluoro-4’-(4-pentyl-cyclohexyl)biphenyl (5CPUF), as well as mixtures E7 and E63 (both from Merck). We note that the three fluorene atoms at 3,4,5 positions in 5CPUF almost “invert” the molecular electrostatic surface potential (MESP) [ 22 ] of the attached phenyl ring compared to the case of cyano-biphenyls (5CB, E7, E63) (as can be seen in [ 19 ]). LCs with phenylcyclohexane core were 1-(trans-4-hexylcyclohexyl)-4-isothiocyanatobenzene (6CHBT) [ 19 ] and some members of the PCH homologous series (PCH3, PCH5 and PCH7) [ 23 ], while LC with bicyclohexane core was the mixture ZLI1695 [ 23 ].…”
Section: Experimental and Materialsmentioning
“…We note that the three fluorene atoms at 3,4,5 positions in 5CPUF almost “invert” the molecular electrostatic surface potential (MESP) [ 22 ] of the attached phenyl ring compared to the case of cyano-biphenyls (5CB, E7, E63) (as can be seen in [ 19 ]). LCs with phenylcyclohexane core were 1-(trans-4-hexylcyclohexyl)-4-isothiocyanatobenzene (6CHBT) [ 19 ] and some members of the PCH homologous series (PCH3, PCH5 and PCH7) [ 23 ], while LC with bicyclohexane core was the mixture ZLI1695 [ 23 ].…”
Section: Experimental and Materialsmentioning
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