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Thermal and ionic‐conductive behaviors of liquid crystalline polymers with alkali metal salt
Author(s) -
Akachi Yosuke,
Kawamura Kenji,
Koide Naoyuki
Publication year - 2001
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.72
Subject(s) - materials science , polyester , lithium (medication) , salt (chemistry) , mesophase , ionic conductivity , crystallinity , phase (matter) , polymer , side chain , ionic bonding , polymer chemistry , alkali metal , inorganic chemistry , chemical engineering , organic chemistry , composite material , liquid crystal , chemistry , ion , medicine , optoelectronics , electrode , engineering , electrolyte , endocrinology
In order to investigate the relationship between ionic conductivity and liquid crystallinity, we prepared the main‐chain type polyester having 1,4‐bisstyrylbenzene units and ethyleneoxide chain in the repeating unit. The main‐chain type polyester with lithium salt at the ratio of 0.04 per polymer repeating unit exhibited a smectic phase. However, the polyester with lithium salt (0.11) showed a nematic phase. The ionic conductivity of the polyester with lithium salt increased with increasing lithium salt concentration. The trans ‐type polyester exhibited a liquid crystalline phase, while the cis ‐type polyester did not show any mesophase. We found that the ionic conductivity of the trans ‐type polyester with lithium salt (0.11) was larger than that of the cis ‐type polyester with lithium salt (0.11). However, a liquid crystalline phase was found in the side‐chain type polyether with alkoxy chain length of below 12. A smectic phase was induced for the non‐mesomorphic polyethers with lithium salt. The layer spacing of the smectic A phase for the non‐mesomorphic polyether with lithium salt decreased from 55 to 41 Å with increasing temperature. The ionic conductivity of the polyether with lithium salt increased with decreasing the layer spacing. Copyright © 2001 John Wiley & Sons, Ltd.