Thermotropic liquid crystalline polymers—19. Peculiarities of the liquid crystalline structure of cholesterol-containing polymers

Freidzon, Ya.S.; Kharitonov, A. V.; Shibaev, Valéry; Platè, N.A.

doi:10.1016/0014-3057(85)90221-6

Cited by 40 publications

(14 citation statements)

References 9 publications

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“…In fact, cholesteric mesophases obtained from simple homopolymer systems have already been documented in the 1980s. Cholesteric mesophases based on acrylate, 13,14 methacrylate, 13,15 and siloxane 16 backbones containing either cholesteryl ester mesogen or chiral phenyl benzoate mesogen as a side-chain have been reported. In these side-chain liquid crystalline polymer (SCLCP) systems, the presence of a flexible aliphatic spacer linking the backbone and mesogens is crucial to access the cholesteric mesophase by enhancing motional freedom of sidechain mesogens.…”

Section: Introductionmentioning

confidence: 99%

“…Although evidence for the existence of the cholesteric mesophase based on selective light reflection properties and characteristic oily streak textures under a polarized optical microscope (POM) has been shown, comprehensive structure-property evaluations of the cholesteric mesophase in the SCLC type homopolymers are rare. 13,17 Recently, we reported the synthesis of a series of SCLC type homopolymers (PNBCh-n) where varied flexible methylene spacer (n ¼ 4, 5, 9, 10 and 15) decouples motion between the polynorbornene backbone and cholesteryl mesogen. 18 Thermal analyses of these PNBCh-n reveal a T g and a liquid crystalline clearing temperature (T cl ), and these transition temperatures can be dramatically tuned depending on the length of the methylene spacer.…”

Section: Introductionmentioning

confidence: 99%

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Cholesteric mesophase in side-chain liquid crystalline polymers: influence of mesogen interdigitation and motional decoupling

Ahn¹,

Gopinadhan²,

Deshmukh³

et al. 2012

Soft Matter

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In this paper, the thermal, optical and mesomorphic properties of side-chain liquid crystalline (SCLC) homopolymers (PNBCh-n), in which cholesteryl mesogens are linked to a polynorbornene backbone by different lengths of methylene spacer (n ¼ 4, 5, 9, 10 and 15), are investigated. By doing so, the impact of flexible spacer length on the formation of different types of LC mesophase is explained. Because of comb-shaped SCLC polymer architecture, smectic mesophases are primarily found in PNBCh-n. Interestingly, cholesteric mesophases are identified only in PNBCh-9 and 10, which are proved by (1) the selective light reflection in UV-Vis analysis, (2) the characteristic oily streak texture under polarized optical microscope (POM) and (3) a long range periodicity in the cross-sectioned films from transmission electron microscope (TEM) investigation. Moreover, temperature-controlled X-ray scattering measurements are performed to examine mesomorphic structure evolution. By comparing the mesomorphic structures in this series of SCLC homopolymers, both extent of mesogen interdigitation and motional decoupling between backbone and mesogenic side-chains are found to play a critical role in the development of cholesteric mesophase. This structure-property study of PNBCh-n will help elucidate the importance of molecular structure, particularly the length of spacers, on the formation of cholesteric mesophase and its importance in the design of thermochromic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cholesteric mesophase in side-chain liquid crystalline polymers: influence of mesogen interdigitation and motional decoupling

Ahn¹,

Gopinadhan²,

Deshmukh³

et al. 2012

Soft Matter

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“…A variety of side-chain liquid crystalline homopolymers (SCLCPs) bearing cholesterol, have been prepared by systematically varying (1) backbone (norbornene, acrylate, methacrylate, siloxane, urethane) and (2) flexible spacers (methylene, siloxane) ( Table 2 ) [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 ]. These polymers are prepared by free-radical polymerization, controlled radical polymerization including atom transfer radical polymerization (ATRP), reversible addition fragmentation and transfer (RAFT) polymerization, metal-catalyzed ring opening polymerization, graft polymerization or step-polymerization methods.…”

Section: Synthesis Of Polymers Bearing Cholesterolmentioning

confidence: 99%

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

et al. 2009

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“…They form chiral nematic and smectic phases and can be usually employed in electro‐ and thermo‐optical applications . By changing the polymer backbone (i.e., acrylate, methacrylate, and siloxane) and flexible spacers (i.e., methylene and siloxane), Chol containing SCLCPs have been prepared . The synthesis of block copolymers {[poly(methyl methacrylatecholesterol‐ b ‐styrene] and poly(cholesterylmethacrylate‐ b ‐2‐hydroxyethyl methacrylate)} have been also reported …”

Section: Introductionmentioning

confidence: 99%

Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism

Doğancı

Çakırlar

Bayır

et al. 2017

J of Applied Polymer Sci

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Methacrylate based side‐chain liquid crystalline polymers (SCLCP) bearing cholesterol pendant moieties with various lengths of aliphatic spacer were synthesized and their electrical conductivity mechanism was studied for their possible applications in elastic microelectronic devices. All the polymers exhibited liquid crystalline behavior of broken focal‐conic fan texture of smectic phase. The dielectric properties of polymers were investigated by impedance spectroscopic technique in the frequency range of 100 Hz to 15 MHz at room temperature. Alternating current (AC) conductivity ( σAC) of the liquid crystalline polymeric films was observed to vary with angular frequency, ω as ωS with s < 2. Detailed conductivity analysis revealed that the conductivity of the polymeric films follows quantum mechanical tunneling and correlated barrier hoping conductivity mechanisms at low frequency regime, whereas it obeys super linear power law and direct current conductivity mechanisms at high frequency region. The investigation of the SCLC polymeric films helped to propose a model system for their possible potential applications. In the light of this study, the SCLC polymers will be employed as the gate insulator for organic field effect transistor applications, such as large area flexible arrays or as other advanced microelectronic devices that have superior performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45207.

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Thermotropic liquid crystalline polymers—19. Peculiarities of the liquid crystalline structure of cholesterol-containing polymers

Cited by 40 publications

References 9 publications

Cholesteric mesophase in side-chain liquid crystalline polymers: influence of mesogen interdigitation and motional decoupling

Cholesteric mesophase in side-chain liquid crystalline polymers: influence of mesogen interdigitation and motional decoupling

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

Methacrylate based side chain liquid crystalline polymers with pendant cholesterol group: Preparation and investigation of electrical conductivity mechanism

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