Effects of main chain and acceptor content on phase behaviors of hydrogen-bonded main-chain/side-chain combined liquid crystalline polymers

Main-chain/side-chain combined liquid crystalline polymers (MCSCLCPs) are usually difficult to synthesize and their degrees of polymerization are relatively low, which bring difficulties in studying their structure–property relationships. In order to solve this problem, we prepared a new series of M...

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Bibliographic Details
Published in:Polymer (Guilford) 2016-02, Vol.84, p.355-364
Main Authors: Yang, Shuai-Qi, Qu, Wei, Pan, Hong-Bing, Zhang, Yu-Dong, Zheng, Shi-Jun, Fan, Xing-He, Shen, Zhihao
Format: Article
Language:English
Subjects:
Chains (polymeric)
Columns (structural)
Derivatives
Hierarchical structure
Hydrogen bonding
Liquid crystal polymers
Main-chain/side-chain combined liquid crystalline polymer
Nematic
Shape memory alloys
Solid phases
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Summary:Main-chain/side-chain combined liquid crystalline polymers (MCSCLCPs) are usually difficult to synthesize and their degrees of polymerization are relatively low, which bring difficulties in studying their structure–property relationships. In order to solve this problem, we prepared a new series of MCSCLCPs containing mesogen-jacketed liquid crystalline polymer (MJLCP) main chains via hydrogen-bonding (H–B). A pyridine derivative with a triphenylene (Tp) unit is the H–B acceptor. In addition to the temperature dependence, the phase behavior of the resulting complex is strongly influenced by the content of the H–B acceptor and the rigidity of the side-chain core of the MJLCP. The resulting complexes exhibit different phase structures: (1) a columnar nematic phase or a smectic A (SmA) phase formed by the supramolecular MJLCP chain as a whole; (2) hierarchical nanostructures including a hexagonal columnar phase or a SmA phase of the whole polymer chain plus a discotic nematic phase associated with the Tp moieties. [Display omitted] •A new series of MCSCLCPs containing MJLCP main chains prepared via hydrogen bonding.•Phase behavior of complex strongly affected by content of H-B donor and rigidity of side-chain core in polymer H-B acceptor.•Complex forming hierarchical nanostructures including one of whole polymer chain and the other of triphenylene moieties.
ISSN:0032-3861
1873-2291
DOI:10.1016/j.polymer.2016.01.018