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Title: Mesomorphic glass-forming ionic complex composed of a pair of cholesterol phthalate and 1-Cn-3-methylimidazolium: Phase transition and enthalpy relaxation behavior
Authors: NAKAJIMA, Itaru
SUGIMURA, Kazuki  kyouindb  KAKEN_id  orcid (unconfirmed)
TERAMOTO, Yoshikuni  kyouindb  KAKEN_id  orcid (unconfirmed)
NISHIO, Yoshiyuki  kyouindb  KAKEN_id
Author's alias: 杉村, 和紀
寺本, 好邦
西尾, 嘉之
Issue Date: Sep-2018
Publisher: Springer Nature
Journal title: Polymer Journal
Volume: 50
Start page: 899
End page: 909
Abstract: Ionic complexes consisting of a mesogenic cholesterol derivative and 1-alkyl (Cn)-3-methylimidazolium (CnMim) (n = 6–18) were prepared from ethanol solutions containing an equimolar mixture of cholesterol hydrogen phthalate (CHP) and 1-Cn-3-methylimidazolium hydroxide; the imidazolium hydroxide was obtained by anion exchange of 1-Cn-3-methylimidazolium bromide. The complex samples, termed [CnMim][CHP], were examined to evaluate their thermal transition patterns. Excluding the two samples (n = 6, 8) that showed no definite ordered phase, the complexes with n ≥ 10 formed a cholesteric (n = 10, 12) or smectic (n = 14–18) mesophase in a considerably wide range of temperatures; this wide range reflects the additional thermotropic property of the salts of CnMim with longer alkyl chains. These fluid mesophases transformed into a mesomorphic vitreous solid without crystallization in a usual cooling process. For the glassy mesomorphic samples of selected complexes (n = 10, 18), the enthalpy relaxation behavior was followed as a function of the aging temperature and time, and the data were analyzed in terms of a Kohlrausch–Williams–Watts (KWW) type of stretched exponential equation. A very narrow distribution of relaxation times was observed for the “liquid crystalline glasses”, indicating the high uniformity of the relaxation mode.
Rights: This is the accepted manuscript of the article, which has been published in final form at
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
DOI(Published Version): 10.1038/s41428-018-0047-5
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