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Synthesis and characterization of crystalline poly(ethyleneimine)s with mesogenic side chains forming liquid crystals on quaternization

✍ Scribed by Patrick Masson; Benoit Heinrich; Yves Frègre; Philippe Gramain

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
652 KB
Volume
195
Category
Article
ISSN
1022-1352

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✦ Synopsis

Abstract

The synthesis and thermal properties of a new type of side‐chain liquid‐crystalline polysalts are described. The polymers are first obtained by partial or complete alkylation of a linear poly(ethyleneimine) with 6‐(4‐methoxy‐4′‐biphenylyloxy)hexyl bromide or 12‐(4‐methoxy‐4′‐biphenylyloxy)dodecyl bromide. In a second step, polysalts are prepared by partial or complete quaternization with acyl bromide or dimethyl sulfate. Differential scanning calorimetry, polarizing optical microscopy and X‐ray diffraction experiments show that the polymers and copolymers alkylated with the mesogenic groups are all crystalline. When quaternized, they exhibit thermotropic smectic A phases. This behaviour confirms the smectogenic function of the ammonium units located in the backbone, as already observed with poly(4‐vinylpyridinium) salts.

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