Influence of structures of polymer backbones on cooperative photoreorientation behavior of p-cyanoazobenzene side chains

Mina Han, Masatoshi Kidowaki, Kunihiro Ichimura, P.S. Ramanujam, Søren Hvilsted

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Photoinduced orientational behavior of a polymethacrylate (CN6) and a polyester (p6a12) with p-cyanoazobenzene side chains was studied to reveal the structural effect of the liquid crystalline polymer backbones. Irradiation with linearly polarized W light resulted in the reorientation of the azobenzene for both polymers toward the direction perpendicular to the electric vector of the incident light. The induced orientation can be slowly amplified by thermal Z-to-E isomerization and be facilitated by irradiation with visible light. For p6a12 with the long alkylene and carbonyl groups in main-chain cooperative orientation of main chains with p-cyanoazobenzene side chains was confirmed using FT-IR spectroscopy, contrary to the case of CN6. Furthermore, in-situ observation of changes in photoinduced birefringence by ellipsometry revealed that thermal treatment plays a significant role in levels of molecular orientation in polymer matrices.
Original languageEnglish
JournalMacromolecules
Volume34
Issue number12
Pages (from-to)4256-4262
ISSN0024-9297
DOIs
Publication statusPublished - 2001

Cite this

Han, Mina ; Kidowaki, Masatoshi ; Ichimura, Kunihiro ; Ramanujam, P.S. ; Hvilsted, Søren. / Influence of structures of polymer backbones on cooperative photoreorientation behavior of p-cyanoazobenzene side chains. In: Macromolecules. 2001 ; Vol. 34, No. 12. pp. 4256-4262.
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title = "Influence of structures of polymer backbones on cooperative photoreorientation behavior of p-cyanoazobenzene side chains",
abstract = "Photoinduced orientational behavior of a polymethacrylate (CN6) and a polyester (p6a12) with p-cyanoazobenzene side chains was studied to reveal the structural effect of the liquid crystalline polymer backbones. Irradiation with linearly polarized W light resulted in the reorientation of the azobenzene for both polymers toward the direction perpendicular to the electric vector of the incident light. The induced orientation can be slowly amplified by thermal Z-to-E isomerization and be facilitated by irradiation with visible light. For p6a12 with the long alkylene and carbonyl groups in main-chain cooperative orientation of main chains with p-cyanoazobenzene side chains was confirmed using FT-IR spectroscopy, contrary to the case of CN6. Furthermore, in-situ observation of changes in photoinduced birefringence by ellipsometry revealed that thermal treatment plays a significant role in levels of molecular orientation in polymer matrices.",
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author = "Mina Han and Masatoshi Kidowaki and Kunihiro Ichimura and P.S. Ramanujam and S{\o}ren Hvilsted",
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Influence of structures of polymer backbones on cooperative photoreorientation behavior of p-cyanoazobenzene side chains. / Han, Mina; Kidowaki, Masatoshi; Ichimura, Kunihiro; Ramanujam, P.S.; Hvilsted, Søren.

In: Macromolecules, Vol. 34, No. 12, 2001, p. 4256-4262.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Influence of structures of polymer backbones on cooperative photoreorientation behavior of p-cyanoazobenzene side chains

AU - Han, Mina

AU - Kidowaki, Masatoshi

AU - Ichimura, Kunihiro

AU - Ramanujam, P.S.

AU - Hvilsted, Søren

PY - 2001

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N2 - Photoinduced orientational behavior of a polymethacrylate (CN6) and a polyester (p6a12) with p-cyanoazobenzene side chains was studied to reveal the structural effect of the liquid crystalline polymer backbones. Irradiation with linearly polarized W light resulted in the reorientation of the azobenzene for both polymers toward the direction perpendicular to the electric vector of the incident light. The induced orientation can be slowly amplified by thermal Z-to-E isomerization and be facilitated by irradiation with visible light. For p6a12 with the long alkylene and carbonyl groups in main-chain cooperative orientation of main chains with p-cyanoazobenzene side chains was confirmed using FT-IR spectroscopy, contrary to the case of CN6. Furthermore, in-situ observation of changes in photoinduced birefringence by ellipsometry revealed that thermal treatment plays a significant role in levels of molecular orientation in polymer matrices.

AB - Photoinduced orientational behavior of a polymethacrylate (CN6) and a polyester (p6a12) with p-cyanoazobenzene side chains was studied to reveal the structural effect of the liquid crystalline polymer backbones. Irradiation with linearly polarized W light resulted in the reorientation of the azobenzene for both polymers toward the direction perpendicular to the electric vector of the incident light. The induced orientation can be slowly amplified by thermal Z-to-E isomerization and be facilitated by irradiation with visible light. For p6a12 with the long alkylene and carbonyl groups in main-chain cooperative orientation of main chains with p-cyanoazobenzene side chains was confirmed using FT-IR spectroscopy, contrary to the case of CN6. Furthermore, in-situ observation of changes in photoinduced birefringence by ellipsometry revealed that thermal treatment plays a significant role in levels of molecular orientation in polymer matrices.

KW - Optik og sensorsystemer

U2 - 10.1021/ma001640p

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