Induced Smectic E Phase in a Binary Blend of Side‐Chain Liquid Crystalline Polymers

Two liquid crystalline polymers containing an azobenzene or cyanobiphenyl mesogenic side chain that adopt smectic A phases are mechanically mixed at 1:1 mesogen molar ratio at an isotropic phase temperature and then cooled. The resultant binary polymer mixture behaves like a single component as reve...

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Bibliographic Details
Published in:Macromolecular rapid communications. 2023-03, Vol.44 (5), p.e2200761-n/a
Main Authors: Hida, Naoki, Nakajima, Tatsunaga, Hara, Mitsuo, Seki, Takahiro, Nagano, Shusaku
Format: Article
Language:English
Subjects:
Azo compounds
Binary mixtures
Calorimetry
Cold Temperature
Differential scanning calorimetry
induced smectic E phase
Liquid crystal polymers
Liquid crystals
Liquid Crystals - chemistry
Phase Transition
Polymer blends
Polymers
Polymers - chemistry
side chain liquid crystalline polymers
Temperature
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Summary:Two liquid crystalline polymers containing an azobenzene or cyanobiphenyl mesogenic side chain that adopt smectic A phases are mechanically mixed at 1:1 mesogen molar ratio at an isotropic phase temperature and then cooled. The resultant binary polymer mixture behaves like a single component as revealed by polarized microscopy observation and differential scanning calorimetry, indicating that the binary mixture forms a fully compatible polymer blend. Moreover, the simple polymer blend unexpectedly leads to a higher‐ordered smectic E phase where a herringbone structure is formed with restricted mesogen axis rotation. These results suggest a specific intermolecular interaction between the two mesogens, thereby inducing unusual compatibilized polymer blends and the most ordered liquid crystal (LC) phase. Two side chain liquid crystalline homopolymers containing an azobenzene or cyanobiphenyl mesogenic side chain that adopt the smectic A phase is mechanically mixed. This simple blending procedure unexpectedly leads to a homogeneous formation of a higher‐ordered smectic E phase where a herringbone structure is formed with restricted axis rotation.
ISSN:1022-1336
1521-3927
DOI:10.1002/marc.202200761