Dielectric relaxation of liquid-crystalline polyrotaxane

A. Inomata; H. Ishibashi; T. Nakajima; Y. Sakai; M. Kidowaki; T. Shimomura; K. Ito

doi:10.1209/0295-5075/79/66004

Dielectric relaxation of liquid-crystalline polyrotaxane

A. Inomata, H. Ishibashi, T. Nakajima, Y. Sakai, M. Kidowaki, T. Shimomura, K. Ito

Research output: Contribution to journal › Article › peer-review

15 Citations (Scopus)

Abstract

A new supramolecular system, liquid-crystalline polyrotaxane (LCPR), has been recently prepared by introduction of 4-cyano-4′-n-pentylbiphenyl (5CB) groups to the cyclic molecules of a polyrotaxane (PR) consisting of polyethylene glycol (PEG) and α-cyclodextrin (α-CD). Here we measured and compared the dielectric relaxations of PR and LCPR in solid state to investigate molecular motions of α-CD in PR and LCPR. It was found that PR exhibited a single relaxation mode while LCPR had two modes. These results suggested that the relaxation mode in PR would be due to the sliding fluctuation of α-CD along the axis chain and that the other mode in LCPR should arise from the rotational fluctuation of α-CD modified by 5CB.

Original language	English
Article number	66004
Journal	EPL
Volume	79
Issue number	6
DOIs	https://doi.org/10.1209/0295-5075/79/66004
Publication status	Published - 2007 Sept 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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AU - Inomata, A.

AU - Ishibashi, H.

AU - Nakajima, T.

AU - Sakai, Y.

AU - Kidowaki, M.

AU - Shimomura, T.

AU - Ito, K.

PY - 2007/9/1

Y1 - 2007/9/1

N2 - A new supramolecular system, liquid-crystalline polyrotaxane (LCPR), has been recently prepared by introduction of 4-cyano-4′-n-pentylbiphenyl (5CB) groups to the cyclic molecules of a polyrotaxane (PR) consisting of polyethylene glycol (PEG) and α-cyclodextrin (α-CD). Here we measured and compared the dielectric relaxations of PR and LCPR in solid state to investigate molecular motions of α-CD in PR and LCPR. It was found that PR exhibited a single relaxation mode while LCPR had two modes. These results suggested that the relaxation mode in PR would be due to the sliding fluctuation of α-CD along the axis chain and that the other mode in LCPR should arise from the rotational fluctuation of α-CD modified by 5CB.

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Dielectric relaxation of liquid-crystalline polyrotaxane

Abstract

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