Design and synthesis of new ferroelectric liquid crystals. 9. An approach to creation of organic polymer thin films with controlled, stable polar orientation of functional groups

Walba, David M.; Keller, Patrick; Parmar, D. S.; Clark, Noel A.; Wand, Michael

doi:10.1021/ja00203a036

Cited by 50 publications

(17 citation statements)

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“…One approach to improving the transverse properties of MLCPs and their adhesion with other polymers is to introduce ionic groups 6–9. Ionic groups should promote interchain interactions and improve the interfacial adhesion in the polymers 10–12. For example, thermotropic MLCPs with ionic groups would offer the possibility of promoting intermolecular interactions through hydrogen bonds or ion–dipole association and improvement of the interfacial adhesion between the phases in blends.…”

Section: Introductionmentioning

confidence: 99%

Mesomorphic phases of main‐chain liquid‐crystalline polymers with pendent sulfonic acid groups

Meng

Zhang

et al. 2008

J of Applied Polymer Sci

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Some main-chain liquid-crystalline polymers were synthesized with pendent sulfonic acid groups (0-6 wt %) on the polymer backbone. The solution viscosity behavior, the chemical structures, and the liquid-crystalline (LC) properties were characterized with Fourier transform infrared spectroscopy, elemental analysis, 1 H-NMR, differential scanning calorimetry, polarizing optical microscopy, and X-ray measurements. All the polymers displayed a smectic mesophase with a mesogenic range of 142-1558C and good thermal stability. With an increasing concentration of sulfonic acid groups in the polymer systems, some of the polymers exhibited two kinds of mesophases, including smectic and nematic phases. The glass-transition temperatures and isotropic-transition temperature were elevated slightly, whereas the temperature of the smectic-nematic phase transition changed a little. For polymers with a few sulfonated benzene groups, the regular mesogen/soft matrix structures led to a smectic structure because of microdomains between the mesogenic moieties and the soft main-chain matrix, whereas for polymers with an increased number of sulfonic groups, the ionic groups were distributed in both the soft matrix and the LC microphase. Although the increased ionic interactions between mesogens led to more crystalline phases, the strong electrostatic interactions in the ionic group/mesogen/soft matrix systems may have been tangled in domains. Therefore, they disturbed the regular mesogen/soft matrix smectic phase structure, leading to the appearance of a smectic-nematic transition.

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Section: Introductionmentioning

confidence: 99%

Mesomorphic phases of main‐chain liquid‐crystalline polymers with pendent sulfonic acid groups

Meng

Zhang

et al. 2008

J of Applied Polymer Sci

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“…Although a number of studies concerning low molecular weight chiral smectic liquid crystalline materials were previously reported, there have been only a few reports on polymeric chiral smectic liquid crystalline materials. However, some successful investigations on the synthesis and characterization of chiral smectic side‐chain liquid crystalline polysiloxanes were recently reported 3–7. Therefore it would be both necessary and useful to synthesize various kinds of liquid crystalline polysiloxanes to explore their potential applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of chiral smectic side‐chain liquid crystalline polysiloxanes and ionomers containing sulfonic acid groups

Zhang

Feng

et al. 2001

J of Applied Polymer Sci

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ABSTRACT:The synthesis of new chiral smectic A (S A ) side-chain liquid crystalline polysiloxanes (LCPs) and ionomers (LCIs) containing 4-allyloxy-benzoyl-4-(S-2-ethylhexanoyl) p-benzenediol bisate (ABB) as mesogenic units and 4-[[4-(2-propenyloxy)phenyl]azo]benzenesulfonic acid (AABS) as nonmesogenic units is presented. The chemical structures of the monomers and polymers are confirmed by FTIR spectroscopy or 1 H-NMR. Differential scanning calorimetry (DSC), optical polarizing microscopy, and X-ray diffraction measurements reveal that all the polymers P I -P IV and ionomers P V -P VI exhibit S A texture. The results seem to demonstrate that the tendency toward the S A -phase region increases with increasing sulfonic acid concentration, and the thermal stability of the S A phase is determined by the flexibility of the polymer backbones and the interactions of sulfonic acid groups.

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“…A great diversity of chiral groups have been used in combination with mesogenic cores to induce chirality in liquid crystals. Comparatively little attention has been devoted to the oxirane ring as a chiral building block [9][10][11][12][13][14][15][16]. 2,3-Disubstituted and 2,2-disubstituted oxirane rings (I and II, respectively) present distinct structural features.…”

Section: Introductionmentioning

confidence: 99%

New monomer liquid crystals containing a chiral 2,2- or 2,3-disubstituted oxirane ring

Galli¹,

Saliva²,

Lotz³

et al. 2000

Designed Monomers and Polymers

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Two new families of chiral monomers were synthesized which consisted of a spaced biphenyl core and a 2,3-disubstituted or 2,2-disubstituted oxirane ring. The former monomers formed liquid crystal mesophases, whereas the latter monomers did not generate any mesophases independent of the spacer lengths investigated. The mesogenic propensity was enhanced in chiral liquid crystals based on the biphenyl benzoate core and either oxirane ring. A linear electro-optic response was detected in the chiral nematic phase and was attributed to the flexoelectric effect.

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Design and synthesis of new ferroelectric liquid crystals. 9. An approach to creation of organic polymer thin films with controlled, stable polar orientation of functional groups

Cited by 50 publications

References 0 publications

Mesomorphic phases of main‐chain liquid‐crystalline polymers with pendent sulfonic acid groups

Mesomorphic phases of main‐chain liquid‐crystalline polymers with pendent sulfonic acid groups

Synthesis and characterization of chiral smectic side‐chain liquid crystalline polysiloxanes and ionomers containing sulfonic acid groups

New monomer liquid crystals containing a chiral 2,2- or 2,3-disubstituted oxirane ring

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