Advanced Industrial and Engineering Polymer Research
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2020
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IF 0
Lishuai Zong,Chuang Li,Yuan Zu,Jinyan Wang,Xigao Jian
Modern microelectronics devices urgently request low dielectric constant materials with commendable mechanical properties. Novel fluorinated poly(aryl ether)s (FPPEs) were prepared by traditional polycondensation of 4-(4-Hydroxylphenyl)(2H)-phthalazin-1-one (DHPZ), Bisphenol AF (BAF) and Decafluorobiphenyl (DFB) to study bulky phthalazinone effects on mechanical and dielectric behavior of polymers. After the introduction of phthalazinone moieties, FPPEs showed excellent solubility to readily solve in many organic solvents like NMP, DMAc, CHCl 3 , and THF. Simultaneously, they exhibited relatively high glass transition temperatures ( T g s) from 180 °C to 294 °C, increasing with the content of phthalazinone groups. The FPPEs still possessed excellent thermal stability with decomposition temperature up to 514 °C and char yield at 800 °C as high as 56% under nitrogen atmosphere. FPPE films showed good mechanical strength with tensile stress higher than 68 MPa and modulus surpassing 10.8 MPa, also increasing with phthalazinone concentration. The dielectric property of FPPEs was investigated with impedance analyzer. FPPE8020 and FPPE 6040 showed dielectric constant from 3.10 to 3.30 and dielectric loss of 0.005–0.008 under a large frequency range of 0.02–60 GHz. The phthalazinone moieties mainly contributed to the decrease of dielectric constant. The results evidently suggest FPPEs as commendable candidate for those high-tech electronic applications.
研究领域:
材料科学
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高分子化学
✓ 已验证
DOI
LIQUID CRYSTALS
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2017
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IF 2.661
Longyan Duan,Dingqian Shi,Pei Chen,Kun Hu,Liyuan Ren,Xinbing Chen,Zhongwei An
Series of laterally multifluorinated heterocyclic compounds, 2-(2ʹ,3-difluoro-4ʹ-alkoxy-1,1ʹ-biphenyl-4-yl)-benzoxazole derivatives (nPF(2)PF(3)Bx), are prepared and characterised. They mainly display enantiotropic nematic mesophases with wider mesophase ranges of 12–107°C (heating process) and 22–134°C (cooling process) than the corresponding analogues. The enhanced nematic mesophase stability is achieved via slightly increasing inter-ring twist angle with inter-ring lateral fluorine substitute in biphenyl unit, as well as through improving the molecular polarity with multifluorine substitutes. Meanwhile, two inter-ring lateral fluorine atoms lead to a decrease in melting/clearing points and a wide nematic mesophase range, which makes it possible for heterocyclic mesogens nPF(2)PF(3)Bx to use in nematic liquid crystal display mixtures.
研究领域:
材料科学
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化学
✓ 已验证
DOI
高影响因子
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
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光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Ting Li,Anjun Hu,Yuanjian Li,Borui Yang,Kun Li,Kai Chen,Jingyun Jiang,Fei Li,Zhi Wei Seh,Jian Wang,Jianping Long
Lithium metal is environmentally sensitive and highly reactive, especially when coupled with flammable organic electrolytes, which pose critical safety challenges for lithium metal batteries under harsh operational conditions. This study tackles this challenge by constructing an integrated strategy for encapsulating lithium metal with a multifunctional polyfluoride ionogel (PFIGE) through in situ thermal polymerization. Based on the cross-linking network design of hexafluorobutyl methacrylate monomer and 1-butyl-3-lithium bis(trifluoromethylsulfonyl)imide ionic liquid plasticizer, C−F group and TFSI − anion cooperate to confer excellent water/oxygen barrier properties of the PFIGE. Meanwhile, the fluorinated skeleton optimizes the Li + flux by regulating anion migration, thereby promoting the formation of stable inorganic-rich interphases and achieving homogeneous lithium deposition. Additionally, the C−F group forms ion−dipole interactions with imidazole cations to achieve dynamic self-healing capabilities, while the condensed-phase physical barrier and gas-phase radical scavenging effect of the pyrolyzed PFIGE synergistically contribute to the battery safety. As a proof-of-concept, PFIGE-integrated Li||LiNi 0.5 Co 0.2 Mn 0.3 O 2 cells demonstrate extended cycling stability at high voltage (4.6 V) and high temperature (80 °C), and a 0.4 Ah-level pouch cell exhibits exceptional resistance to thermal runaway under mechanical/electrical/thermal abuse conditions. This design philosophy presents a paradigm-shifting electrolyte system that significantly enhances the cycle life and safety of lithium metal batteries.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS ES&T Water
·
2024
·
IF 4.8
Wenya Ao,Md Manik Mian,Qianxin Zhang,Ziming Zhou,Shubo Deng
Adsorption by activated carbon (AC) is a practical approach to removing per- and polyfluoroalkyl substances (PFAS) from water, but designing a highly efficient carbon for the adsorption of target PFAS using a low-cost strategy remains a challenge. Herein, we report that bamboo-biochar prepared by vacuum carbonization and steam activation serves as an alternative adsorbent to commercial AC for PFAS removal. The optimal biochar (V500A) exhibited an adsorption capacity of 1.23 and 0.77 mmol/g for perfluorooctanesulfonate and 6:2 fluorotelomer sulfonate (6:2 FTS), respectively, which outperforms the previously reported biochar, and the adsorption rate was 2.4 times higher than that of the commercial AC F400. An excellent adsorption performance by V500A in electroplating wastewater and drinking water demonstrates its versatile applicability. Pore reaming played a major role in the adsorption enhancement, and the hydrophobic and electrostatic interactions were mainly responsible for PFAS adsorption. In addition, pyrolysis regeneration at a mild temperature (500 °C) can effectively reactivate spent biochar. The results of this study are expected to provide a feasible pore-designing approach to achieving the preparation of cost-effective biochar-based adsorbents for PFAS removal from contaminated water.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
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2023
·
IF 3.6
Yi Qin,Lingxiang Chu,Tao Yang,Jing Wan,Qiang Zhou,Yanqing Ye,Huaijun Tang,Zhengliang Wang
In this study, an efficient polyfluoride red-emitting phosphor, Cs 3 RbGe 2 F 12 :Mn 4+ (denoted as CRGF:Mn), has been synthesized using a simple co-precipitation method. The crystal and electronic structures, spectroscopic properties, and photoluminescence thermal stability of CRGF:Mn have been systematically characterized. The results show that Mn 4+ ions experience a strong crystal field and present a series of intense red emission peaks under blue light excitation. Moreover, CRGF:Mn exhibits a high color purity (95.1 %), high internal quantum efficiency (82.4 %), and enhanced photoluminescence thermal stability at 150 °C, with an intensity of 113 % relative to room temperature . A warm white light-emitting diode exhibiting a low correlated color temperature (3572 K), high color rendering index (90.7), and suitable luminous efficiency (132.6 lm/W) was prepared using CRGF:Mn as a red component, demonstrating viable application in solid-state lighting.
研究领域:
材料科学
·
光学
·
固态照明
✓ 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）