Liquid-Crystalline Elastomers Containing Sulfonic Acid Groups

Zhang, Baoyan; Meng, Fanbao; Zang, Bao‐Ling; Hu, Jianshe

doi:10.1021/ma021333e

Cited by 24 publications

(17 citation statements)

References 16 publications

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“…The LC monomer cholest‐5‐en‐3‐ol(3β)‐10‐undecenoate ( M1 ) and the intermediate 4‐allyloxybenzoyl chloride ( 1 ) were prepared according to previous reports 4, 21. The synthesis routes of the polymers and the chiral LC monomer cholesteryloxycarbonylmethyl 4‐allyloxybenzoate ( M2 ) are shown in Scheme .…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of side‐chain cholesteric liquid‐crystalline polysiloxanes containing different space groups

Wang

Meng

et al. 2008

J of Applied Polymer Sci

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A series of liquid-crystalline (LC) polysiloxanes were synthesized by two different cholesteric monomers, cholest-5-en-3-ol(3b)-10-undecenoate and cholesteryloxycarbonylmethyl 4-allyloxybenzoate. The chemical structures and LC properties of the monomers and polymers were characterized by various experimental techniques, including Fourier transform infrared spectroscopy, 1 H-NMR, elemental analysis, differential scanning calorimetry, and polarized optical microscopy. The specific rotation absolute values increased with increasing rigid spacers between the main chain and the mesogens. All of the polymers exhibited thermotropic LC properties and revealed cholesteric phases with very wide mesophase temperature ranges. With a reduction in the softspace groups in the series of polymers, the glass-transition temperature and the isotropic temperature increased slightly on heating cycles. Reflection spectra of the cholesteric mesophase of the series of polymers showed that the reflected wavelength shifted to short wavelengths with decreasing soft-space groups in the polymers systems, which suggested that the helical pitch became shorter with increasing rigid-space groups.

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Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of side‐chain cholesteric liquid‐crystalline polysiloxanes containing different space groups

Wang

Meng

et al. 2008

J of Applied Polymer Sci

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“…It was determined that increasing the amount of sulfonic acid groups from 0-1% causes a decrease in the LC range for the cholesteryl siloxane polymers with a loss of LC character for percentages higher than 1% [40]. …”

Section: Neat State Self-assembly Of Polymers Comprising Cholesterolmentioning

confidence: 99%

Polymers Comprising Cholesterol: Synthesis, Self-Assembly, and Applications

et al. 2009

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“…We determine the effective crosslink density by swelling experiments as depicted in our previous study. 11 We used Brannon-Peppas equation to describe this ionic contribution term for both ionic systems:…”

Section: Effective Crosslink Densitymentioning

confidence: 99%

Cholesteric Liquid-Crystalline Elastomers Prepared from Ionic Bis–Olefinic Crosslinking Units

Meng¹,

Zhang²,

Li³

et al. 2005

Polym J

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ABSTRACT:A series of cyclosiloxane-based cholesteric LCEs were synthesized by using a LC monomer cholest-5-en-3-ol(3)-4-(2-propenyloxy)benzoate and an ionic divinyl monomer 2,2 0 -(1,2-ethenediyl)-bis [5-[(4-undecenoyloxy)phenyl]-azo]-benzenesulfonic acid. The polymers were prepared in a one-step reaction with ionic crosslinking contents ranging between mass content 0 and 11.8%. Their chemical structures and liquid-crystalline properties were characterized by FT IR, 1 H NMR, DSC, POM and X-ray measurement. The effective crosslink density (M c ) was determined by swelling experiments in mixed buffer/organic solvent mixtures, using Brannon-Peppas models. All the polymers exhibit thermotropic LC properties and reveal cholesteric phase. With increase of ionic crosslinking component in the polymers, the melting behavior disappears and the temperature of clear point decreases. Reflection spectra of cholesteric mesophase of the series of polymers showed that the reflected wavelength becomes broad and shifts to long wavelength with increase of the ionic crosslinking component in the polymer systems. [DOI 10.1295/polymj.37.277] KEY WORDS Liquid-Crystalline Elastomer / Sulfonate Groups / Cholesteric Phase / Polysiloxane / Slightly crosslinked liquid crystalline (LC) polymers that combine the properties of liquid crystalline phases and the elastic properties and form stability of polymeric networks are known as liquid crystalline elastomers (LCEs). They possess unique features originating from rubber elasticity, and the orientation of the mesogens can be controlled by mechanical forces as well as by electric and magnetic fields. As a result of these remarkable characteristics LCEs are promising materials for optoelectrical applications, including polarization halography, optical memory, integrated optical circuitry, and nonlinear optical generators.

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Liquid-Crystalline Elastomers Containing Sulfonic Acid Groups

Cited by 24 publications

References 16 publications

Synthesis and characterization of side‐chain cholesteric liquid‐crystalline polysiloxanes containing different space groups

Synthesis and characterization of side‐chain cholesteric liquid‐crystalline polysiloxanes containing different space groups

Polymers Comprising Cholesterol: Synthesis, Self-Assembly, and Applications

Cholesteric Liquid-Crystalline Elastomers Prepared from Ionic Bis–Olefinic Crosslinking Units

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