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Authors
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Puneet, P. ; Kumar, L. ; Singh, S. ; Horechyy, A. ; Srivastava, R.K. ; Nandan, B.
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Title
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Reversal of handedness of ionic liquid-based chiral block copolymers via self-assembly in solution and bulk phase
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Date
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02.03.2022
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Number
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60558
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Abstract
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Polymerized ionic liquid (PIL)-based ionic chiral block copolymers (BCPs*) were synthesized by functionalization of a poly(4-vinyl pyridine) segment in poly(styrene)-block-poly(4-vinyl pyridine) (PS-b-P4VP) block copolymer. Because of the ease of the ion exchange reaction with the quaternized PIL block, chirality was induced with L-/D-histidine, which acted as chiral auxiliaries, via ion-exchange reaction. Interestingly, the self-assembled helical nanofibrils of BCPs* divulged the reversal of handedness with respect to intrinsic chirality at the molecular level. Remarkably, a similar reversal of handedness was also observed at the quaternary phase. This peculiar behavior of reversal of handedness was correlated to the molecular packing of helical chains according to a cholesteric hard-core model of liquid crystals possessing a large helical pitch to helix diameter (P/d) ratio, where P and d denote the helical pitch and helix diameter, respectively.
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Publisher
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Polymer Chemistry
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Wikidata
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Citation
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Polymer Chemistry 13 (2022) 1911-1919
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DOI
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https://doi.org/10.1039/D2PY00186A
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Tags
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