MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2021
·
IF 0.896
Xiangfei Kong,Ronggen Luo,Hongkang Gong,Dong Chen,Shijun Yang,Shiqing Li,Guixia Wang,Zhiqun He
A novel aggregation-induced emission active molecules (TP-Cn-PETPE, n = 4 and 10) were synthesized, which contain a tetraphenylethene derivative as the emission active moiety, a pentahexyloxytriphenylene core as the mesogenic unit and an alkoxy spacer. Experimental results revealed that these two compounds both had AIE properties, even in the liquid state at room temperature. While only TP-C4-PETPE showed a monotropic liquid crystal phase upon heating. In addition, these two compounds were fully characterized by 1H and 13C NMR, IR, EA and MS.
研究领域:
材料科学
·
化学
·
液晶
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2020
·
IF 4.613
Shang Gao,Ze-ping Liu,Yue-hua Cong,Xiao-zhi He,Bao-yan Zhang,Fan-bao Meng,Ying-gang Jia
With polymethylhydrogensiloxane (PMHS) as the main chain, two series side-chain cholesteric liquid crystal polymers (ChLCPs) with different liquid crystal side chain lengths were prepared by hydrosilylation reaction. Then two series of cholesteric fluorescent liquid crystal polymers (FL-ChLCPs) were obtained by etherification reaction. The obtained FL-ChLCPs have both excellent mesomorphic behavior, and great photoluminescent property. We confirmed their chemical structures by FT-IR, and 1 H NMR spectroscopy , and found them with excellent thermal stability by TGA . We characterized their mesomorphic behavior and thermal performance by POM, DSC and XRD , and confirmed all the polymers belonged to cholesteric phase. FL-ChLCPs emitted different-intensity fluorescence under UV light, and we found some regularity by PL spectrum.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHARMACEUTICAL SCIENCES
·
2023
·
IF 3.8
Wenxuan Cao,Jingbao Chen,Long Wu,Yu hang Xu,Yun Meng,Xiang Li,Zhiyun Zheng,Xiaoqin Chu
Purpose The aim of this study was to develop liquid crystal (LC) precursors to obtain novel long-acting analgesics for injection based on depot systems and compare the difference between the cubic and hexagonal precursors in delivering Diclofenac sodium (DS). Methods Diclofenac sodium liquid crystal precursor injections were prepared and characterized, followed by in vitro release, pharmacodynamic , and pharmacokinetic studies. Results The optimal formulations were prepared with a ratio of Phytantriol/ethanol/water as 76:19:5 for cubic LC precursors, and a ratio of Phytantriol/ethanol/water/Vitamine-E acetate as 72:18:5:5 for hexagonal, both loading various drug dosages (2.5%, 3.75% and 5%), respectively. Polarized light microscopy and small angle diffraction confirmed that the precursors were isotropic fluids and transformed into gels with Pn3m or HII framework in water. Rheological studies have shown that precursors belong to Newtonian fluids and gels to pseudoplastic fluids. The release showed that the DS in the commercial injection (DS-inj) was completely liberated within 6 h, whereas only 46.55% and 49.73% of the DS in 2.5% cubic precursors and 2.5% hexagonal precursors were freed, respectively. Pharmacodynamic studies have shown that cubic, hexagonal and DS-inj raised the pain threshold in mice by 169.4%, 157.3% and 113.79%, respectively. The mean retention times of DS in cubic and hexagonal were 3.16 and 2.67 times longer than DS-inj, respectively, according to pharmacokinetic results. Conclusion In conclusion, cubic and hexagonal are both promising analgesic sustained release formulations. In addition, based only on the current comparison, cubic seems to have a better long-acting effect.
研究领域:
药剂学
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药物递送系统
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药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2021
·
IF 0
Peng Wei,Hejuan Lou,Yifeng Zhang,Wei Zhang,Yawei Bian,Yumin Xia,Yanping Wang,Yimin Wang
In this study, three novel main-chain liquid-crystal polyurethanes based on mesogenic diol 4,4ʹ-bis(6-hydroxyhexoxy)biphenyl (BP6), azo diol 4,4ʹ-bis(6-hydroxyhexyloxy)-azobenzene (BHHAB) and 4,4ʹ-diisocyanato-3,3ʹ-dimethylbiphenyl (DMBDI) were synthesised via polyaddition method. The chemical structure, thermal properties, liquid-crystal behaviour and microstructure were fully characterised by FTIR, 1HNMR, UV spectrum, Differential scanning calorimetry (DSC), Thermogravimetric analyzer (TGA), Polarizing optical microscope (POM) and X-ray diffraction techniques. The resulted polyurethanes showed strong UV absorption at 313 nm ascribed to π–π* transition of azo group. All of the polyurethanes showed multiple transitions on DSC curve, which could be ascribed to crystal, melting and isotropization transitions combined with the POM observation. The thermal degradation of the polymers occurred at much higher temperatures (325–331°C) than the melting ones (144–154°C), making the melt processing feasible. The polyurethane showed semicrystalline structure based on diffraction and DSC results. The obtained polyurethanes exhibited smectic mesophase as verified by variable temperature WAXD results, and the mesophase temperature range was more than 25°C based on the POM observation. The obtained polyurethanes could be potentially used in optical and smart intelligence material area.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
Materials
·
2025
·Vol. 18
·期 7
·1406
·
IF 3.2
Yunxiao Ren,Wei Hu
Polymer-dispersed liquid crystals (PDLCs) are composite materials, in which LCs are dispersed in the form of microdroplets in a polymer matrix. As a composite material, its electro-optical properties are affected by many factors such as molecular structure, composition, and the microstructure of the LCs and polymers. In this work, PDLC films were prepared based on the thiol-ene click reaction, and effects of refractive indexes of polymers and LCs on their electro-optical properties were studied. The refractive indexes of the polymer matrix are adjusted by controlling the content of sulfur element, and those of the LCs are adjusted by adding multi-fluorinated LCs with high refractive index. By regulating the refractive indexes of the polymer matrix and LCs, the maximum transmittance of the film is raised and the viewing angle of the film is also extended. This work could afford some ideas for the directional regulation of the viewing angles and the electro-optical properties of the PDLC film.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LIQUID CRYSTALS
·
2024
·
IF 2.4
Zongqi Li,Jinghua Zhao,Liming Wu,Yi Li,Wei Liu,Yonggang Yang
Photorecording materials have been applied for information recording. Herein, a cinnamate liquid crystal with an enantiotropic nematic phase was synthesised, which can be isomerised and polymerised under the irradiation of the 365-nm UV light. Cholesteric liquid crystal polymer network (CLCN) films were prepared using the mixtures of it, LC242, a chiral dopant and a photoinitiator. The CLCN films possess a slight gradient helical pitch which increases from the bottom to the top of the films. The formation of this structure should be driven by the photoisomerisation of the cinnamate. Under the irradiation of 365-nm UV light with a low intensity, the CLC mixtures show a photochromic behaviour which is proposed to be driven by the formation of oligomers. Based on this, the CLC mixtures can be applied for optical recording.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2012
·Vol. 1
·期 7
·1482-1490
·
IF 0
Hong Yang,Fei Zhang,Bao-Ping Lin,Patrick Keller,Xue-Qin Zhang,Ying Sun,Ling-Xiang Guo
This manuscript describes a series of mesogen-jacketed liquid crystalline polymers (MJLCPs) and elastomers (MJLCEs) bearing a novel polynorbornene backbone, onto which the liquid crystalline mesogen is laterally attached by a single covalent bond without spacers. The side-on mesogenic monomers are synthesized via palladium-catalyzed exo-hydroarylation of norbornadiene, and then polymerized using a Grubbs' catalyst initiated ring opening metathesis polymerization (ROMP) method. MJLCEs are prepared by mixing the MJLCPs with bifunctional benzophenone cross-linkers, pulling fibers to achieve a fine alignment, and crosslinking under UV illumination. Their mesomorphic, thermo-actuation and mechanical properties are studied in detail by a combination of 1H NMR, gel permeation chromatography, thermogravimetric analysis, differential scanning calorimetry, polarized optical microscopy, X-ray diffraction and dynamic mechanical analysis. These newly designed polymers can decouple the dynamics of the very bulky and rigid polynorbornene main chain and the mesogenic side groups to achieve liquid crystallinity, only if the length of alkoxy terminal chains of the mesogens is long enough (the number of the carbons in the alkoxy group, n > 9). Moreover, interesting external force induced reversible thermal-actuation behaviors of smectic MJLCEs are observed and analyzed as well.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
LIQUID CRYSTALS
·
2025
·
IF 2.2
Jifeng Gao,Yuansen Zhi,Xuemei Yang,Guiyang Yan,Jianshe Hu,Xiaozhi He,Baoyan Zhang
In this paper, eight new liquid crystal compounds containing cholesterol and camphoric acid as chiral agents were designed and synthesised, and the cinnamic acid group as a bridge bond is introduced into the system to make the synthesised liquid crystal compounds have certain optical properties with excellent liquid crystal properties. The structure of liquid crystal compounds was characterised by FT-IR, 1H NMR and 13C NMR. The liquid crystal phase behaviour of liquid crystal compounds was characterised by POM, DSC and TGA. The optical properties of liquid crystal compounds were tested by ultraviolet-visible spectroscopy. The influence of different carbon chain lengths on liquid crystal performance and selective reflection performance was explored. The synthesised liquid crystal compounds were observed to exhibit diverse liquid crystalline textures, distinct selective reflection colours, and high thermal stability, demonstrating favourable optical properties. These chiral compounds demonstrate significant application potential, offering a viable pathway for chiral optical material development.
研究领域:
材料科学
·
化学
·
液晶
·
光学材料
·
有机合成
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Ying Li,Changdan Gong,Chenggong Li,Kunpeng Ruan,Chao Liu,Huan Liu,Junwei Gu
Polymer-dispersed liquid crystal (PDLC) films comprising polyvinyl alcohol (PVA) and liquid crystal monomer (LCM) were successfully obtained by the method of solution casting & thermal compressing. LCM was distributed orderly in PVA matrix by hydrogen bond interaction, to form PVA-LCM interpenetrating-layered networks. When the mass fraction of LCM was up to 35 wt%, the corresponding in-plane thermal conductivity coefficient ( λ // ) of PDLC film was significantly increased to 1.41 W m −1 K −1 , about 10.8 times that of neat PVA (0.13 W m −1 K −1 ). High intrinsic λ // values of PDLC films were mainly attributed to the formed microscopic-ordered structures from ordered stacking of LCM, ordered arrangement of PVA chains, and their hydrogen bond interaction. This work would offer a new way to design and prepare novel intrinsic high thermal conductive polymers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 9
·1294
·
IF 2.7
Cong Ma,Yishuo Wu,Meina Yu,Yanzi Gao,Jiumei Xiao,Cheng Zou,Huai Yang
Polymer-dispersed liquid-crystal (PDLC) films have wide applications in light shutters, smart windows for cars and buildings, dimming glasses, and smart peep-proof films due to their switchable optical states under electrical fields as well as large area processibility. They are usually prepared with liquid crystals (LCs) and non-liquid crystalline monomers (NLCMs). Introduction of liquid crystalline monomers (LCMs) into PDLCs might spark new functionality or high-performance devices such as polymer-dispersed and -stabilized liquid crystals. In this study, the effect of molecular structures and doping concentrations of acrylate LCMs on the electro-optical properties and micro-structures of PDLC films is systematically studied. The pore size of polymer networks and the driving voltage of the PDLC films are affected by the molecular polarity and degree of functionality of the LCMs. The electro-optical properties of the PDLC films are affected by the synergistic influence of molecular structure of LCMs and micro-structures of PDLCs. These results might provide the experimental and theoretical basis for constructing the relationship between the molecular structure of LCM, micro-structure and electro-optical response of PDLC films.Keywords:liquid crystalline monomers;acrylates;polymer-dispersed liquid crystals;electro-optical properties;micro-structure
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2016
·
IF 4.055
Yafei Wang,Jiang Fan,Junwei Shi,Hongrui Qi,Etienne Baranoff,Guohua Xie,Qingguo Li,Hua Tan,Yu Liu,Weiguo Zhu
In this context, a series of platinum complexes containing a triphenylene unit, namely Pt5 Pt8 , was prepared and characterized. Platinum complex Pt6 shows a clearly column liquid crystalline property, confirmed by differential scanning calorimetry , polarized optical microscopy and X-ray diffraction. These platinum complexes only display monomolecular emission both in solution and in neat film, an effect attributed to the presence of carbazole as a bulky group disfavoring aggregation of the complexes. Hole mobilities in the range of 10 −5 –10 −6 cm 2 V −1 s −1 were obtained for the annealed platinum complexes films. It was found that the method to align the emissive layer has a crucial role on the performance of the devices. The first example of polarized phosphorescent white organic light-emitting diode (OLED) with polarized ratio of 1.4 was achieved in Pt6 -based device. This research opens up a new aspect of phosphorescent metallomesogens application for polarized white light emission.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Jianhang Zhao,Yongjie Yuan,Lei Chen,Ye Li,Hailiang Zhang
Liquid crystalline physical gels (LCPGs) with stable mechanical properties and fast electro-optical response properties were prepared through the self-assembly of side chain liquid crystalline polymers (SCLCPs) with different spacer length poly [ω-4′-cyano-(1, 1′-biphenyl)] acrylate (PmACB, m is the spacer length of SCLCP, m = 0, 2, 4) as gelators in a nematic liquid crystal , 4-pentyl-4′-cyanobiphenyl (5CB). The gel-sol phase transition temperature (T GS ), micro morphology, mechanical properties and electro-optical properties of LCPGs (SCLCPs/5CB) were systematically studied. The results show that only P0ACB can form stable liquid crystalline physical gels in 5CB and show excellent thermal stability, good self-supporting ability and fast electro-optical response properties. The T GS of 6 wt% P0ACB/5CB gel is 192 °C, and it also showed stable mechanical properties, its storage modulus is about 1.0 × 10 4 Pa. The threshold voltage (V th ) and saturation voltage (V sat ) of P0ACB/5CB gel with 3 wt% concentration are 0.29 V μm −1 and 3.906 V μm −1 respectively, and the off state response time is only 6.748 ms. Moreover, the addition of the polymer does not affect the electro-optical response of the LCPGs.
研究领域:
材料科学
·
液晶技术
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）