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Smectic C Self‐Assembly in Mesogen‐Free Liquid Crystalline Chiral Polyethers with Sulfonylated Methyl‐Branched Side Chains

Journal Article · · Macromolecular Rapid Communications
 [1];  [2];  [2];  [2];  [3];  [2];  [1]
  1. Department of Chemistry University of Tennessee Knoxville TN 37996 USA
  2. Depcartment of Macromolecular Science and Engineering Case Western Reserve University Cleveland OH 44106‐7202 USA
  3. National Synchrotron Light Source II Brookhaven National Laboratory Upton NY 11973 USA

Abstract

To realize advanced electrical applications for ferroelectric liquid crystalline polymers, high spontaneous polarization ( P s ) is highly desired. However, current ferroelectric liquid crystalline polymers usually exhibit a low P s . In this work, mesogen‐free, chiral polyethers containing sulfonylated methyl‐branched alkyl side chains with a (CH 2 ) 3 O spacer between the sulfonyl and the branched alkyl groups are designed and synthesized. In contrast to the linear n ‐alkyl side chains, the methyl‐branched alkyl side chains induce chain tilting in the smectic layers. When double chirality exists in both the main chain and the side chains, a crystalline structure is observed after mechanical stretching. Intriguingly, when single chirality exists in either the backbone or the side chains, a liquid crystalline smectic C phase is obtained. The electric displacement–electric field study, however, does not show typical ferroelectric switching, although the dielectric constants are relatively high for these liquid crystalline polymers. This is likely because the dipole–dipole interactions among neighboring sulfonyl groups along the main chain are so strong that the ferroelectric switching is hindered in the samples. For the future work, it is desired to weaken the dipole–dipole interaction to achieve ferroelectricity in these mesogen‐free liquid crystalline polymers.

Sponsoring Organization:
USDOE
Grant/Contract Number:
NONE; SC0012704
OSTI ID:
1879582
Alternate ID(s):
OSTI ID: 1899878
OSTI ID: 2007530
OSTI ID: 1908291
Journal Information:
Macromolecular Rapid Communications, Journal Name: Macromolecular Rapid Communications Journal Issue: 1 Vol. 44; ISSN 1022-1336
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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