Chiral side-chain liquid crystalline polysiloxanes bearing fluorinated mesogens and cholesteryl groups

Meng, Fanbao; Lian, Jiao; Zhang, Baoyan; Sun, Yan–Hui

doi:10.1016/j.eurpolymj.2007.11.010

Cited by 13 publications

(6 citation statements)

References 27 publications

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“…Recently, side chain liquid crystalline polymers (SCLCPs), which combine the unique properties of low‐molar mass liquid crystals and polymers, have been the subject of intensive research mainly due to their interesting electrical and optical properties which makes them good candidates for applications in microelectronic devices ranging from optical data storage1–4 and nonlinear optics5–8 to being the stationary phase in gas chromatography9, 10 and high performance liquid chromatography 11, 12. Side chain liquid‐crystalline polymers (LCPs) are usually prepared by covalently linking rigid mesogens to a polymer backbone through flexible spacers.…”

Section: Introductionmentioning

confidence: 99%

Poly(N‐vinylimidazole) based hydrogen bonded side chain liquid crystalline polymer

Gürsel

Şenkal

Kandaz

et al. 2010

Polymers for Advanced Techs

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A new poly(N-vinylimidazole) (PVI) based side chain liquid crystalline polymer (HB-PLC) was prepared from PVI as a hydrogen bond acceptor polymer and 11-(4-cyanobiphenyl-4(-oxy)undekan-1-ol (LC11) by molecular self-assembly processes via hydrogen bond formation between nitrogen of PVI and hydroxyl group of the LC11. The formation of Hbond was confirmed by using FTIR spectroscopy. The liquid crystalline behavior of the HB-PLC was investigated by differential scanning calorimeter (DSC) and polarized optical microscopy. The thermal behaviors of the H-bonded liquid crystalline polymer were investigated by DSC measurements under various heating rates. The HB-PLC shows a transition temperature of 97-C with an relatively high enthalpy change of 140.6 J/g corresponding to the transition from liquid crystalline nematic phase to isotropic phase. The activation energy required for liquid crystal phase transformation was found to be 551.75 kJ/mol.

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Section: Introductionmentioning

confidence: 99%

Poly(N‐vinylimidazole) based hydrogen bonded side chain liquid crystalline polymer

Gürsel

Şenkal

Kandaz

et al. 2010

Polymers for Advanced Techs

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“…It is found that with an increase in the number of methylene units in the side chains of the polymers, there is an increase in the layer spacing values for the cholesteric liquid crystalline phases as measured by WAXD. Poly(methylhydrosiloxane) based LC polymers with fluorinated mesogens, show smectic LC phase with very wide temperature ranges during heating and cooling cycles [19]. However, the polymers with high fluorine content exhibit smectic-cholesteric phase transition when they are heated.…”

Section: Introductionmentioning

confidence: 99%

“…As the polymers contain more fluorinated mesogens, the segregation of the fluorinated segment to the surface may occur at the mesomorphic temperature. The highly ordered lamellar mesogen-siloxane matrix systems may disturb severely by separation of fluorinated mesogens, suggesting the transition from lamellar smectic to cholesteric phase [19]. Thus there are numerous reports on phase transition behavior of different LC polymers, but there are only a limited number of reports on silicone based liquid crystal polymers [20][21][22][23][24][25][26] though these polymers are expected to be more thermally stable after several heating and cooling cycles and thus may have potential industrial applications.…”

Section: Introductionmentioning

confidence: 99%

Phase transition behavior of silicone based liquid crystalline polymers

Jana¹,

Bhunia

Im³

2011

E-Polymers

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Phase transition behavior of silicone based liquid crystalline (LC) polymers with variable isotropic transition temperatures (T i ), synthesized from poly(methyl hydrosiloxane), 10-undecenoic acid based crosslinking agent and cholesterol based side chain mesogen, was studied by differential scanning calorimetry (DSC), polarizing optical microscopy (POM), and X-ray diffraction (XRD) measurements. The chemical structure of the mesogenic monomer and the LC polymers were confirmed by Fourier transform infra-red (FT-IR) spectroscopy and 1 HNMR spectroscopy. DSC studies showed that the glass transition temperatures (T g ) and T i of the LC polymers decreased with increasing proportion of mesogenic crosslinking agent at its low proportion and at its higher proportion T i disappeared completely indicating that the polymeric chains had less chance to orient in the network structure. The results were consistent with the XRD and POM studies.

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“…Side chain liquid crystalline polymers (SCLCPs), which combine the unique properties of low‐molar mass liquid crystals and polymers, have been the subject of intensive research mainly because of their interesting electrical and optical properties which makes them good candidates for applications in microelectronic devices ranging from optical data storage and nonlinear optics . Side chain liquid‐crystalline polymers are usually prepared by covalently linking rigid mesogens to a polymer backbone through flexible spacers.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of chalcone‐containing methacrylate‐based hydrogen bonded side chain liquid crystalline polymer and its dielectric properties

Korkmaz

Gürsel

Canlı

et al. 2015

Polymers for Advanced Techs

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In this work, a new methacrylate-based hydrogen bonded side chain liquid crystalline polymer having chalcone moieties (HBCP) was prepared from poly(4-(3-(pyridin-4-yl)acryloyl) phenyl methacrylate) and 11-(4-cyanobiphenyl-4(-oxy) undekan-1-ol (LC11)) by molecular self-assembly processes via hydrogen bond formation between nitrogen of the HBCP and hydroxyl group of the LC11. The formation of H bond was confirmed by using Fourier transform infrared (FTIR) spectroscopy. The phase transition temperatures and liquid crystalline phases of the HBCP were examined by DSC and POM measurements. The dielectric properties of HBCP have been determined by impedance analyzer within the frequency interval of 100 Hz-15 MHz. According to Cole-Cole plot, the equivalent circuit of the LC system has been found as a capacitor in parallel with a resistor. The resonance frequency, f r , of the R-C circuit has also been calculated as 1.59 MHz by phase angle versus frequency curve. The dielectric relaxation type of HBCP has been determined as nearly-Debye type because the absorption coefficient, α, equals to 0.01655. From the conductivity point of view, HBCP displays dc conductivity at the low and high frequency regions that correspond to 100 Hz-12 kHz and 3.3 MHz-15 MHz, respectively. On the other hand, it has been revealed that the ac conductivity of the LC system investigated obeys Super Linear Power Law (SLPL) at the intermediate frequency domain.

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Chiral side-chain liquid crystalline polysiloxanes bearing fluorinated mesogens and cholesteryl groups

Cited by 13 publications

References 27 publications

Poly(N‐vinylimidazole) based hydrogen bonded side chain liquid crystalline polymer

Poly(N‐vinylimidazole) based hydrogen bonded side chain liquid crystalline polymer

Phase transition behavior of silicone based liquid crystalline polymers

Synthesis of chalcone‐containing methacrylate‐based hydrogen bonded side chain liquid crystalline polymer and its dielectric properties

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