RSC Advances
·
2016
·Vol. 6
·期 96
·93539-93545
·
IF 3.289
Ye Zhu,Hai-Bo Zhang,Lian-Jun Ding,Zheng Chen,Da-Ye Sun,Zhen-Hua Jiang
Perfluorocarbon groups or related compounds are usually used to modify polymer materials because of their low surface energy properties. In this paper, a novel perfluorocarbon-containing compound was synthesized and used as a capping agent for the preparation of perfluorocarbon chain terminated poly(ether sulfone). The regulation of the fluorine content was achieved by controlling the molecular weight. FTIR and 1H NMR spectra were used to confirm the existence of perfluorocarbon terminated groups in the polymer chains. In addition, the ratios of F/C were acquired by integral area calculation from the 1H NMR spectrum. XPS characterization showed that the surface migration phenomenon of fluorine became apparent along with the increase of the F/C ratio. Further testing found that the introduction of perfluorinated end groups into the PES chains had little influence on the polymers' mechanical and thermal performance, by contrast, their surface energy decreased efficiently from approximately 40 mJ m−2 to 16 mJ m−2 with the F/C ratio on the surface increased from 0 to 0.556, which could develop PES as a low surface energy material for industrial applications.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2016
·
IF 1.207
Fang Jin,Xianqiao Wang,Tieliang Liu,Linbo Xiao,Ming Yuan,Yangchun Fan
A new effective process to improve the utilization of industrial fluorosilicic acid of phosphate fertilizer by-product has been investigated to comprehensive application of the silicon and fluorine source. Two-step ammoniation was applied to recover high-quality silica. The recovered silica can be used to hydrothermal synthesize ZSM-5 zeolite without impurity phase contamination, which was confirmed by XRD, TG, SEM, BET and EDS characteristic techniques. It was found that with the increase of SiO 2 /Al 2 O 3 ratio and the extension of reaction time, the crystal type transform from the orthorhombic to the monoclinic phase. The impurity fluorine content of the recovered SiO 2 from H 2 SiF 6 has great influence on the hydrothermal process for ZSM-5 crystal structure formation. Moreover, the increase of fluorine ions content in the hydrothermal process can control the crystal morphology and size of synthesized ZSM-5. Catalytic properties of synthesized HZSM-5 with different SiO 2 /Al 2 O 3 ratio in transalkylation of toluene and 1,2,4-trimethylbenzene show good and stable catalytic performance. The ZSM-5 synthesized with recovered silica source exhibits similar catalyst life as the performance of small particle size HZSM-5, because the ZSM-5 synthesized with the silica source from industrial hexafluorosilicic acid prefers a thin disk crystal along the b axis direction, which shortens the diffusion distance of generated products.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2024
·
IF 4.1
Hao Zheng,Zejun Zheng,Dirong Gong,Chun Tian,You Wen,Zhen Wang,Jingling Yan
The rapid development of high-speed communication networks has imposed more stringent requirements on the comprehensive performance of dielectric materials. In this work, a series of fluorinated poly(aryl ether)s (FPAEs) were prepared from 4,4′-dihydroxy-2,2′-bis(trifluoromethyl)biphenyl (TFBP) and different difluoride monomers through nucleophilic substitution reactions. The FPAE films had good thermal stability, with 5% weight loss temperature (Td5) values of 514–555 °C in nitrogen and glass transition temperature (Tg) values of 178–226 °C. Furthermore, these polymer films showed excellent hydrophobicity, with water contact angles ranging from 92.4° to 98.7°, and water absorption of 0.28–0.87%. Consequently, the FPAE films showed low dielectric constants of 2.07–2.80 and low dielectric loss of 0.002–0.006 at 11 GHz and 30 °C. These outstanding properties were attributed to their high fluorine contents and twisted biphenyl structures in the polymer chains.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Ruirui Shi,Xinyi Han,Lin Zhu,Jinghao Hao,Hua Wang,Chuanjian Zhou
Fluorosilicone rubber (FSR) has become an indispensable sealing material due to its exceptional adaptability to extreme temperatures and non-polar media environments. In this study, the influence of interfacial interactions and fluorine content in FSR composites on their mechanical properties and oil resistance was investigated. Three modified M5s (@M5) were firstly prepared by surface modification of fumed silica M5 using three fluorinated silane coupling agents with different chain lengths. Among them, though 13F@M5 and 17F@M5 exhibit weaker interfacial interactions with the FSR matrix, they exhibit remarkable hydrophobicity (water contact angle >142°) and dispersibility. Additionally, among the three @M5/FSR composites, 13F@M5/FSR and 17F@M5/FSR exhibit excellent tensile strength (>11.1 MPa) and elongation at break (>490 %), while 3F@M5/FSR shows superior oil resistance, with only a 5.1 % decrease in tensile strength after 48 h of immersion in IRM 901 at 150 °C. The analysis of the interfacial structures reveals that interfacial interactions play a decisive role in the oil resistance of FSR composites, whereas the fluorine content indirectly affects the oil resistance by preventing the oil molecules from immersing into the interphase. The present study not only provides a comprehensive understanding of interfacial interactions and the influence of fluorine content on the properties of FSR composites, but also offers valuable insights for the design of high-performance composite interfaces.
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
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jiating Wen,Zhe Sun,Jun Xiang,Haojun Fan,Yi Chen,Jun Yan
A series of fluorinated waterborne polyurethane (FWPU) with various lengths of fluorinated side chains were synthesized by using different fluoro alcohol-terminated isocyanate trimer (F-HDIT) which prepared from hexafluoroisopropanol (HFIP), 2,2,3,3,4,4,5,5-octafluoropentanol (OFP), 3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluoro-1-octanol (TFO) and hexamethylene diisocyanate trimer (HDIT). The influences of fluorocarbon chains' length and fluorine content on the properties of FWPU, involving contact angle, surface energy of film and critical surface tension of emulsion were well-investigated in detail. The XPS result showed that the surface atom percentage of fluorine element of film increased from 0.58 for 6FWPU-5 to 28.19 for 13FWPU-20 with the escalation of F-HDIT content and the length of fluorocarbon lateral chain, which results in the water contact angle increment and surface energy reduction of FWPU films. Similarly, along with the increase of F-HDIT content and fluorocarbon side chains' length, the surface tension of FWPU emulsion exhibited a downtrend with the order of 13FWPU-20 (33.4 mNm −1 ) < 8FWPU-20 (36.5 mN·m −1 ) < 6FWPU-20 (36.9 mN·m −1 ) < FWPU-0 (40.0 mN·m −1 ). Besides, the enrichment of fluorocarbon chains can be deduced from AFM 3D morphology. The control sample FWPU-0 showed a relatively smooth surface while FWPU samples exhibited spike-like surface, indicating that the migration of fluorine side chains might increase the surface roughness of FWPU films.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 125
·期 4
·3068-3075
·
IF 1.289
Yunquan Jin,Baoqing Shentu,Zhixue Weng
Fluorine-containing polyester (FPE) was synthesized by the reaction of phthalic anhydride, epichlorohydrin, and 2,2,3,3-tetrafluoropropyl glycidyl ether (TFGE) at the catalysis of tetraethylammonium bromide using 1,4-butanediol as the initiator. The structure of FPE was characterized by 1 H NMR and 19 F NMR, and the result showed that the fluorine in TFGE was introduced into FPE. Fluorine content in FPE was determined by oxygen-flask combustion and fluoride selective electrode. It was found that fluorine content in FPEs increased with the increase of TFGE content. The wettability of water and oil on the cured coating based on FPE was investigated by contact angle meter. Contact angles of water and diiodomethane on the cured coatings first increased with the increase of the fluorine content in FPEs and then remained constant. The X-ray photoelectron spectroscopic analysis showed that the F / C molar ratio on the coatings surface was much higher than the overall F / C molar ratio, which indicated that fluoroalkyl groups in FPEs had enriched on the coatings surface. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 3
·616-629
·
IF 2.162
Long Zhang,Qinggang Kong,Fanxin Kong,Taolin Liu,Haiyan Qian
A novel fluorinated chain extender, (1-(ethyl(2-hydroxyethyl)amino)-3- ((3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)oxy)propan-2-ol) (FPO), was synthesized and characterized by nuclear magnetic resonance (NMR), Fourier transform infrared (FTIR), and elemental analysis. Poly (ether urethane)s containing various amounts of the chain extender with fluorinated side chains (FPUs) were prepared by isophorone diisocyanate (IPDI), polytetra-methylene-ether-glycol (PTMG), 3-aminopropyltriethoxysilane (KH-550), and 1,4-butandiol (BDO). Films of FPUs were investigated by water absorption, contact angle, pencil hardness, adhesive force, and thermal analysis. Coating FPUs on micro-nano concave-convex structure plate realizes superhydrophobic performance. Scanning electron microscope (SEM) and atomic force microscopy (AFM) demonstrated that there is a lot of irregular concave-convex structure, which forms a typical air cushion model. X-ray photoelectron spectroscopy (XPS) analysis showed that surface fluorine content is 165% more than that of film average fluorine content. The superhydrophobic plate with 10% or higher F-containing FPUs coating is of outstanding chemical corrosion resistance, excellent solvent resistance, and wear resistance.
研究领域:
材料科学
·
表面化学
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产品关联
DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 22
·8066
·
IF 4.927
Bo Cao,Xiaodan Huang,Wenxiang Zhang,Peng Wu
In this study, a fluorine-containing flow modifier (Si-DF) with low surface energy is successfully synthesized, which is applied to fabricate ideal electronic packaging materials (BN/PPS composites) with high thermal conductivity, excellent dielectric properties, processability, and toughness by conventional melt blending. Si-DPF is located at the interface between the BN fillers and the PPS matrix, which not only improves the dispersion of BN fillers but also strengthens the interaction. With the help of 5 wt% Si-DF,BN/PPS/Si-DF (70/25/5)still exhibits the high thermally conductive coefficient (3.985 W/m·K) and low dielectric constant (3.76 at 100 MHz) although BN fillers are loaded as high as 70 wt%. Moreover, the sample processes a lower stable torque value (2.5 N·m), and the area under the stress–strain curves is also increased. This work provides an efficient way to develop high-performance polymer-based composites with high thermally conductive coefficients and low dielectric constants for electronic packaging applications.Keywords:BN/PPS composites;fluorine-containing flow modifier;dispersion;thermal conductivity;dielectric property
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Jiying Chang,Chao Zhang,Xin Yang,Shaoming Qiao,Xianghua Chen
Carbon fluoride (CF x ), recognized as a high-voltage material, exhibits elevated voltage and tunable electrochemical behavior. This study systematically investigates the impact of F content on the physical properties and electrochemical performance. Thermogravimetric analysis revealed that CF x with 60 % F content maintains an impressive mass retention of 98.2 % at temperatures up to 450°C. At current density of 20 mA/cm 2 , the CF x containing 58 % F atom achieves the highest specific capacity of 578 mAh/g. Furthermore, CF x with 55 % F content attains a peak voltage exceeding 3.0 V. Hence, F contens influence the application of CF x . This work provides valuable insights for the design of CF x cathodes in thermal batteries.
研究领域:
材料科学
·
电化学
·
储能
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 46
·e54686
·
IF 3
Xiaoyun Ma,Xin Lu,Manlin Yuan,Hao Lin,Xinyi Pan,Shiao-Wei Kuo,Zhong Xin
The rapid development of integrated circuits puts forward higher requirements for low dielectric constant polymers. In this study, two fluorinated benzoxazine monomers, bis-(3,4-dihydro-3-(4-fluoro-3-(trifluoromethyl)phenyl)-2H-1,3-benzoxazine)isopropane (BA-ftfa) and bis-(3,4-dihydro-3-(4-fluoro-3-(trifluoromethyl)phenyl)-2H-1,3-benzoxazine)isoperfluoropropane (BAF-ftfa), were successfully synthesized. Differential scanning calorimeter (DSC) was used to monitor the thermal curing behaviors of the monomers and their mixtures. Five groups of polybenzoxazine samples with different fluorine content (25% ~ 35%) were obtained by copolymerizing the two monomers with different mass ratios. The effects of fluorine content on dielectric properties were investigated and the results show that PBAF-ftfa with the highest fluorine content has the lowest dielectric constant of 2.53 at 1 MHz. Furthermore, the results of thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA) show that all polymers possess excellent thermal stability and exhibit high glass transition temperatures over than 180°C.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 17
·e53769
·
IF 3
Yingyi Ma,Zian He,Yuhang Han
The dielectric and other properties of low-dielectric-constant materials after heating are crucial to their performance and use, but rarely studied. In this article, sandwich-type porous polyimide (PI) film in which porous structures located on both upper and lower surfaces of flat PI film was prepared through the simple, low-cost and green microemulsion method. The porous structures were preserved after heating due to the usage of thermally stable fluorine-contained PI (FPI) and PI as skeleton and substrate of the porous structure, respectively, but with the increase of pore size because of the removal of thermally unstable surfactant on the inner surface of the pores. More importantly, 2.89%–5.57% of reductions in the dielectric constant with the maintenance of low dielectric loss and water absorption and high mechanical strength were observed after heating. Therefore, the low dielectric properties of heated films were well preserved upon high humidity treatment. Moreover, the structure and properties of the heated films could be adjusted via controlling the parameters in the microemuslion method. These excellent properties after the high-temperature treatment facilitate the application of the sandwich-type porous PI film as dielectric materials in high-temperature environment.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 11
·2574
·
IF 5
Donghan Li,Chen Yang,Ping Li,Lu Yu,Shufa Zhao,Long Li,Hailan Kang,Feng Yang,Qinghong Fang
Functional liquid fluoroelastomers are in high demand in new energy fields. And these materials have potential applications in high-performance sealing materials and as electrode materials. In this study, a novel high-performance hydroxyl-terminated liquid fluoroelastomer (t-HTLF) with a high fluorine content, temperature resistance, and curing efficiency was synthesised from a terpolymer of vinylidene fluoride (VDF), tetrafluoroethylene (TFE), and hexafluoropylene (HFP). A carboxyl-terminated liquid fluoroelastomer (t-CTLF) with controllable molar mass and end-group content was first prepared from a poly(VDF-ter-TFE-ter-HFP) terpolymer using a unique oxidative degradation method. Subsequently, an efficient “one-step” reduction of the carboxyl groups (COOH) in t-CTLF into hydroxyl groups (OH) was achieved via the functional-group conversion method using lithium aluminium hydride (LiAlH4) as the reductant. Thus, t-HTLF with a controllable molar mass and end-group content and highly active end groups was synthesised. Owing to the efficient curing reaction between OH and isocyanate groups (NCO), the cured t-HTLF exhibits good surface properties, thermal properties, and chemical stability. The thermal decomposition temperature (Td) of the cured t-HTLF reaches 334 °C, and it exhibits hydrophobicity. The oxidative degradation, reduction, and curing reaction mechanisms were also determined. The effects of solvent dosage, reaction temperature, reaction time, and ratio of the reductant to the COOH content on the carboxyl conversion were also systematically investigated. An efficient reduction system comprising LiAlH4can not only achieve an efficient conversion of the COOH groups in t-CTLF to OH groups but also the in situ hydrogenation and addition reactions of residual double bonds (C=C) groups in the chain, such that the thermal stability and terminal activity of the product are improved while maintaining a high fluorine content.Keywords:liquid fluoroelastomer;LiAlH4;reduction;hydroxyl
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）