Structural Study of Liquid Crystalline Long-Chain n-Alkylammonium Polyacrylates

A series of alkyl and dialkylammonium polyacrylates were synthesized by neutralizing a 5000 molecular weight poly(acrylic acid) with alkyl- and dialkylamines. Their thermal stability was investigated using thermogravimetry. Their thermotropic liquid crystal behavior was analyzed using differential s...

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Bibliographic Details
Published in:Macromolecules 1997-11, Vol.30 (23), p.7191-7195
Main Authors: Tsiourvas, Dimitris, Paleos, Constantinos M, Skoulios, Antoine
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Thermal and thermodynamic properties
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Summary:A series of alkyl and dialkylammonium polyacrylates were synthesized by neutralizing a 5000 molecular weight poly(acrylic acid) with alkyl- and dialkylamines. Their thermal stability was investigated using thermogravimetry. Their thermotropic liquid crystal behavior was analyzed using differential scanning calorimetry, polarizing optical microscopy, and X-ray diffraction. The dodecyl, didodecyl, and tetradecyl derivatives exhibited a smectic A phase in the whole range of temperatures explored, from ambient to thermal degradation. The hexadecyl, octadecyl, and dioctadecyl derivatives exhibited a smectic A phase at high temperatures and an ordered smectic B or E phase at low temperatures. Structures and structural parameters are briefly discussed.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma970853k