Multimesophase transitions of main-chain liquid crystalline copolymers with strictly alternating fluorocarbon chains

Main-chain liquid crystalline polymers seldom develop into a columnar phase, let alone mesophase transitions between the columnar phase and other phases as the temperature changes. Herein, we present a new series of main-chain liquid crystalline copolymers which consist of strictly alternating rod-l...

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Bibliographic Details
Published in:Polymer chemistry 2021-02, Vol.12 (5), p.736-743
Main Authors: He, Enjie, Tu, Kai, Cheng, Jiannan, Lu, Huanjun, Zhang, Lifen, Cheng, Zhenping, Zhu, Xiulin
Format: Article
Language:English
Subjects:
Addition polymerization
Aromatic compounds
Copolymers
Crystal structure
Crystallinity
Liquid crystal polymers
Liquid crystals
Mesophase
Perfluoroalkyl & polyfluoroalkyl substances
Phase transitions
Polymer chemistry
Segments
Termination (polymerization)
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Summary:Main-chain liquid crystalline polymers seldom develop into a columnar phase, let alone mesophase transitions between the columnar phase and other phases as the temperature changes. Herein, we present a new series of main-chain liquid crystalline copolymers which consist of strictly alternating rod-like aryl ester core, alkyl chain and perfluoroalkyl segments synthesized by photoinduced step transfer-addition and radical-termination (START) polymerization. The mesophases can be adjusted by changing the length of alkyl chains or perfluoroalkyl segments, which have been fully investigated and simulated in terms of molecular arrangements of molecules. Importantly the resultant liquid crystalline copolymers can present rare reversible phase transitions from a hexagonal columnar phase to a rectangular columnar phase and finally to a smectic phase with temperature increasing. Main-chain liquid crystalline perfluoroalkyl-containing alternating copolymers present rare reversible phase transitions from a hexagonal columnar phase to a rectangular columnar phase and finally to a smectic phase with the temperature increasing.
ISSN:1759-9954
1759-9962
DOI:10.1039/d0py01644f