Volume 79, Number 6, September 2007
|Number of page(s)||4|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||21 August 2007|
Dielectric relaxation of liquid-crystalline polyrotaxane
Department of Advanced Materials Science, Graduate School of Frontier Sciences, The University of Tokyo 5-1-5 Kashiwanoha, Kashiwa-shi, Chiba 277-8561, Japan
2 CREST, Japan Science and Technology Agency (JST) - 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
3 Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology - Koganei, Tokyo 184-8588, Japan
Accepted: 1 August 2007
A new supramolecular system, liquid-crystalline polyrotaxane (LCPR), has been recently prepared by introduction of 4-cyano--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.
PACS: 61.30.Vx – Polymer liquid crystals / 77.22.Gm – Dielectric loss and relaxation
© Europhysics Letters Association, 2007
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