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Synthesis and characterization of new methyl-substituted azomethine-siloxane liquid crystal macrocycles

Influence of the methyl-substitution on the cycle formation

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Summary

This article is devoted to the synthesis of new methyl-substituted azomethine-siloxane macrocyclic dimers. They have been obtained by an intramolecular interiminination reaction of linear polydimethylsiloxane-block-polyazomethine main-chain liquid crystal polymers. The reaction has been studied on mono-, di- and tetramethyl-substituted azomethine moities to estimate the influence of methyl-substitution on the feasibility of the reaction. Specific conditions (diluted solution, strong acid catalysis, recrystallization) led to pure macrocyclic dimers, which have been characterized by SEC, 13C NMR and X-ray crystallography. This reactional process is the first step for synthesis of substituted liquid crystal macrocyclic structures, which constitute a new family in the liquid crystal polymer field.

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Authors and Affiliations

  1. Laboratoire de Synthèse Macromoléculaire (URA24-CNRS), Université P. et M. Curie, 4, place Jussieu, Tour 54, 4ème étage, F-75252, Paris Cedex 05, France

    E. Borgès-Lopès, P.-J. Madec & E. Maréchal

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  1. E. Borgès-Lopès
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  2. P.-J. Madec
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  3. E. Maréchal
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Borgès-Lopès, E., Madec, PJ. & Maréchal, E. Synthesis and characterization of new methyl-substituted azomethine-siloxane liquid crystal macrocycles. Polymer Bulletin 34, 523–530 (1995). https://doi.org/10.1007/BF00423347

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  • DOI: https://doi.org/10.1007/BF00423347

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