Supramolecular side-chain liquid crystalline polymers with various kinked pendant groups

Hong-Cheu Lin*, Yen Shyi Lin, Yu Sheng Lin, Yao Te Chen, Ito Chao, Ta-Wei Li

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

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 monomerpolymer 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.

Original languageEnglish
Pages (from-to)7298-7311
Number of pages14
JournalMacromolecules
Volume31
Issue number21
DOIs
StatePublished - 20 Oct 1998

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