Supramolecular Side-Chain Liquid Crystalline Polymers with Various Kinked Pendant Groups

Supramolecular Side-Chain Liquid Crystalline Polymers with Various Kinked Pendant Groups

Supramolecular side-chain liquid crystalline polymers with various kinked pendant groups are constructed from positional isomers of proton acceptor monomers and donor polymers (with different molecular weights) through hydrogen bonding. Monomer−monomer complexes of similar structures are built to co...

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Veröffentlicht in:Macromolecules 1998-10, Vol.31 (21), p.7298-7311
Hauptverfasser: Lin, Hong-Cheu, Lin, Yen-Shyi, Lin, Yu-Sheng, Chen, Yao-Te, Chao, Ito, Li, Ta-Wei
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Sprache:eng
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Applied sciences
Chemical modifications
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
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container_end_page 7311
container_issue 21
container_start_page 7298
container_title Macromolecules
container_volume 31
creator Lin, Hong-Cheu
Lin, Yen-Shyi
Lin, Yu-Sheng
Chen, Yao-Te
Chao, Ito
Li, Ta-Wei
description Supramolecular side-chain liquid crystalline polymers with various kinked pendant groups are constructed from positional isomers of proton acceptor monomers and donor polymers (with different molecular weights) through hydrogen bonding. Monomer−monomer complexes of similar structures are built to compare the influence of the proton donors bound to the polymer backbones. Due to the bending effects introduced by the positional isomers, we are able to tune the molecular shape and thus to modify the mesogenic properties. New liquid crystalline properties are introduced by the kinked molecular geometry, and their kinked architecture is supported by the quantum mechanical calculations, the powder X-ray diffraction (XRD) patterns, and the deviation temperatures (ΔT). Mesogenic properties of monomer−polymer complexes have similar trends as those of monomer−monomer complexes. Compared with analogous hydrogen-bonded (H-bonded) monomer−monomer complexes, higher isotropization temperatures and broader ranges of mesogenic phases (e.g., SA phase) are observed in the kinked supramolecular polymers. Significantly, H-bonded positional isomerism leads to dissimilar structures and properties of supramolecular side-chain liquid crystalline polymers.
doi_str_mv 10.1021/ma980720e
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subjects Applied sciences
Chemical modifications
Exact sciences and technology
Inorganic and organomineral polymers
Physicochemistry of polymers
title Supramolecular Side-Chain Liquid Crystalline Polymers with Various Kinked Pendant Groups
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