Liquid Crystalline Polymers

Wang, Xin-Jiu; Zhou, Qifeng

doi:10.1142/5309

Cited by 107 publications

(69 citation statements)

References 9 publications

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“…S16c) and at χ = 31.3, 141.6, 208.7, and 329.3 for PPLG 63 -g-BPOEG 3 (Fig. S17c), suggesting the smectic C phases of PPLG 26 -g-BPOEG 3 and PPLG 63 -g-BPOEG 3 with tilt angles [35] of 53.2 and 58.7 (Table 2, entry 2 and 5), respectively.…”

Section: Phase Behaviorsmentioning

confidence: 98%

“…In the high-angle region (> 15), the scattering peaks showed the scattering peaks at 2θ = 19.48, 21.82 and 27.18 ascribing to the crystal E phase [33,34] . When the temperature was above the T g (131.1 C for PPLG 26 -g-BPOEG 2 and 136.9 C for PPLG 63 -g-BPOEG 2 ) and below the T m (178.1 C for PPLG 26 -g-BPOEG 2 and 190.3 C for PPLG 63 -g-BPOEG 2 ), the scattering peaks at low-/high-angle regions were retained, indicating heterogeneous phases comprising of liquid crystalline Smectic C (SmC) phase [35,36] and crystal E phase ( Table 2, entry 1 and 4). The phase transitions of PPLG n -g-BPOEG 2 sample exhibited no isotropic phase below respective decomposition temperatures.…”

Section: Phase Behaviorsmentioning

confidence: 99%

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Synthesis, characterization and phase behaviors of polypeptides bearing biphenyl mesogens and oligo-ethylene-glycol tails

et al. 2015

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A series of polypeptides bearing biphenyl mesogenic side-chains and oligo-ethylene-glycol (OEG) tails (PPLG n -g-BPOEG m , n = 26 and 63, m = 2, 3, and 7) has been synthesized via a 1,3-dipolar cycloaddition with quantitative grafting density. FTIR results revealed that the polypeptides adopted highly stable -helix in the temperature range of 25200 °C.DSC, POM and WAXS analysis revealed that PPLG n -g-BPOEG m (m ≤ 3) samples with short OEG tail length showed two main phase transitions including crystal to liquid crystalline (smectic C, SmC) phase transition and the melting transition of crystalline E-phase, while PPLG n -g-BPOEG 7 with longer OEG tail length (m = 7) exhibited the melting transitions without the formation of liquid crystalline phase.

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Section: Phase Behaviorsmentioning

confidence: 98%

Section: Phase Behaviorsmentioning

confidence: 99%

Synthesis, characterization and phase behaviors of polypeptides bearing biphenyl mesogens and oligo-ethylene-glycol tails

et al. 2015

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“…16,23,[27][28][29][34][35][36][37]41,42,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61][62][63] The Landau-de Gennes model, used in this work, based on the order parameters of the mesophase (orientation, molecular order, chirality) is able to describe equilibrium phase transitions, surface wetting and anchoring, flow birefringence and flow induced orientation, defect and pattern formation, electro-magnetic effects, and optical responses, among others. Previous work has demonstrated the benefits of the LdG approach to describe equilibrium and nonequilibrium phenomena in acid Collagen I solutions, biological plywoods, and spider silks.…”

Section: Theory and Simulationmentioning

confidence: 99%

“…For semi-flexible rods with persistence length q 5 j/kT, we expect the critical rod concentration threshold to decrease with increasing q. 1,16,37,38 For charged rods, Coulombic repulsion (bZ 2 ) will promote the isotropic phase and the critical rod concentration threshold increases with Z. 16,39 For thermotropic/lyotropic mixtures that undergo the IN transition but no phase separation, DMS predicts that the mixture temperature threshold is a nonlinear function of concentration and molecular weights 16,41,42 ; the mixture IN transition can occur at a temperature lower than the transition temperature of the lower molecular weight component.…”

mentioning

confidence: 99%

Liquid crystal models of biological materials and silk spinning

Rey

Herrera‐Valencia

2011

Biopolymers

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A review of thermodynamic, materials science, and rheological liquid crystal models is presented and applied to a wide range of biological liquid crystals, including helicoidal plywoods, biopolymer solutions, and in vivo liquid crystals. The distinguishing characteristics of liquid crystals (self-assembly, packing, defects, functionalities, processability) are discussed in relation to biological materials and the strong correspondence between different synthetic and biological materials is established. Biological polymer processing based on liquid crystalline precursors includes viscoelastic flow to form and shape fibers. Viscoelastic models for nematic and chiral nematics are reviewed and discussed in terms of key parameters that facilitate understanding and quantitative information from optical textures and rheometers. It is shown that viscoelastic modeling the silk spinning process using liquid crystal theories sheds light on textural transitions in the duct of spiders and silk worms as well as on tactoidal drops and interfacial structures. The range and consistency of the predictions demonstrates that the use of mesoscopic liquid crystal models is another tool to develop the science and biomimetic applications of mesogenic biological soft matter.

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“…In this paper, we have prepared new liquid crystalline polymer bonded silica containing cyanobiphenyl mesogens as the stationary phase for LC by SI-ATRP [22][23][24][25]. The cyanobiphenyl liquid crystals are one of the classic liquid crystals and famous for their good chemical stability and satisfactory anisotropy which is a reflection of good conformational order [26][27][28]. The latter feature would benefit the stationary phase to exhibit good shape selectivity.…”

Section: Introductionmentioning

confidence: 99%

Cyanobiphenyl-Mesogened Liquid Crystalline Polymer Bonded on Silica as the Stationary Phase with Shape and Polarity Recognition for LC

Zheng

Wang

et al. 2011

Chromatographia

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Cyanobiphenyl-mesogened liquid crystalline polymer is bonded on silica by surface-initiated atom transfer radical polymerization and is used as the stationary phase for liquid chromatography. Various instrumental analyses such as elemental analysis, X-ray photoelectron spectroscopy and differential scanning calorimetry were used for its characterization. The stationary phase exhibits multiple characteristics of low hydrophobicity, low hydrophobic selectivity, polarity recognition and shape selectivity in the separation of polyaromatic hydrocarbons and polar neural aromatic compounds. Temperature and mobile phase composition were confirmed to have effects on the chromatographic behavior. Isomers of polyaromatic hydrocarbons and carotenes are well separated on the stationary phase.

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Liquid Crystalline Polymers

Cited by 107 publications

References 9 publications

Synthesis, characterization and phase behaviors of polypeptides bearing biphenyl mesogens and oligo-ethylene-glycol tails

Synthesis, characterization and phase behaviors of polypeptides bearing biphenyl mesogens and oligo-ethylene-glycol tails

Liquid crystal models of biological materials and silk spinning

Cyanobiphenyl-Mesogened Liquid Crystalline Polymer Bonded on Silica as the Stationary Phase with Shape and Polarity Recognition for LC

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