Odd‐even effects in polymeric liquid crystals
作者:
Antonio Roviello,
Augusto Sirigu,
期刊:
Die Makromolekulare Chemie
(WILEY Available online 1982)
卷期:
Volume 183,
issue 4
页码: 895-904
ISSN:0025-116X
年代: 1982
DOI:10.1002/macp.1982.021830413
出版商: Hüthig&Wepf Verlag
数据来源: WILEY
摘要:
AbstractSemiflexible mesophasic polymers of the general formula\documentclass{article}\pagestyle{empty}\begin{document}$ \rlap{--} [{\rm OOC(CH}_{\rm 2} {\rm )}_{n - 2} - {\rm COO} - {\rm R}^1 \rlap{--} ]_{\rm X} ,n = 9,11,13,\rlap{--} [{\rm OOC(CH}_{\rm 2} )_{n - 2} - {\rm COO} - {\rm R}^2 \rlap{--} ]_{\rm X} ,n = 9,11,13,14, $\end{document}and\documentclass{article}\pagestyle{empty}\begin{document}$ \rlap{--} [{\rm OOCO} - {\rm (CH}_{\rm 2} {\rm )}_{n - 4} - {\rm OCOO} - {\rm R}^2 \rlap{--} ]_{\rm X} ,n = 9,11,13, $\end{document}where\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm R}^{\rm 1} = - {\rm C}_{\rm 6} {\rm H}_{\rm 5} - {\rm C}({\rm CH}_3 ) = {\rm CH} - {\rm C}_6 {\rm H}_5 - $\end{document}and\documentclass{article}\pagestyle{empty}\begin{document}$ {\rm R}^{\rm 2} = {\rm C}_{\rm 6} {\rm H}_{\rm 5} - {\rm C}({\rm CH}_3 ) = {\rm N} - {\rm N} = ({\rm CH}_3 ){\rm C} - {\rm C}_6 {\rm H}_5 - $\end{document}are prepared and their solid and liquid crystalline behaviour examined and compared to that of the corresponding homologues withneven. Evidence is given of relevant odd‐even effects in the thermodynamic parameters of the clearing transition. The conclusion is drawn in favour of an anisotropic structuration also of the flexible parts of the polymer chain in the liquid crystal phas
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