POLYMER
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2024
·
IF 4.1
Pengfei Chen,Yinyu Zhang,Ping Zhang,Xiuli Zhao,Yeping Wu
High-performance thermoplastics , such as polyether ether ketone (PEEK) and polyester sulfone (PES), are extensively utilized across various industries owing to their exceptional properties. However, their relatively low surface energy often leads to insufficient bonding strength when adhering PEEK or PES. Commonly used surface pretreatments, such as acid-base and plasma treatments, have drawbacks including the use of toxic acids and bases, complex procedures, and poor stability. In this study, we synthesized four catechol-functionalized prepolymers by reacting bisquinone A with dithiols or diamines in a 1:1 M ratio. These catechol-containing prepolymers were employed as surface primers, and the adhesion performance before and after primer treatment was examined using epoxy adhesive for bonding tests. Compared to untreated samples, the lap shear strengths of surface primed PEEK and PES were significantly enhanced by 181 % and 114 %, respectively. These results indicate that the synthesized prepolymers with catechol structures can effectively serve as adhesive primers for bonding.
研究领域:
材料科学
·
生物仿生学
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产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Zidan Wang,Jiangkun Luo,Wenyan Cui,Xinran Miao,Hongzhan Chen,Tianbao Ma
A novel PTFE/Nomex fiber fabric composite reinforced by sulfonated polyether-ether-ketone (PN-SPEEK) was designed and fabricated, which has comprehensive properties with self-lubricity, high strength and toughness at wide cryogenic temperature range. The tensile strength and toughness were increased by 16.9 % and 64.3 % at −160 °C compared to conventional phenolic-formaldehyde-reinforced fabric (PN-PF), and the wear rate dramatically reduced to 2.7 × 10 -16 m 3 /(N•m). Within the temperature range of −160 °C to 25 °C, the variation of friction coefficient for PN-SPEEK was flattened between 0.086 and 0.126, which increased dramatically to approximately 0.2 with decreasing temperatures for PN-PF. The transfer film was analyzed comprehensively and thoroughly, demonstrating that the improved stable lubricity was primarily attributed to favorable formation of tribofilm composed of plenty of PTFE and strong chelation between SPEEK and iron base in transfer film. The developed PN-SPEEK is greatly expected for engineering applications .
研究领域:
材料科学
·
工程学
✓ 已验证
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 6
·622
·
IF 2.8
Yongheng Zhang,Longyu Zhang,Yuehong Zhang,Pingping Yu,Qisheng Hu,Ying Liu,Yanyan Zheng
Implant-associated infections (IAIs) are major complications in dental and orthopedic implants, potentially compromising osseointegration and eventually causing implant loosening or removal. Thus, early prevention of bacterial adhesion and biofilm formation is critical for successful long-term osseointegration. Polyetheretherketone (PEEK) exhibits excellent physicochemical properties and an elastic modulus similar to bone tissue, making it a promising material for dental and orthopedic implants. However, its inherent lack of antibacterial properties limits its ability to prevent IAIs. Herein, an antibacterial coating with controlled drug release and excellent biocompatibility is designed by immobilizing minocycline (Mino)-doped carboxymethyl chitosan (CMCS) onto the PEEK surface via a polydopamine (PDA)-mediated Michael addition and Schiff base reaction. The coating is characterized by SEM, XPS, water contact angle measurements, and in vitro Mino release assays. Antibacterial activity is evaluated using the zone of inhibition (ZOI), turbidity, and colony counting assays, while biocompatibility is assessed through a SEM analysis of cell morphology and CCK-8 assay. The results show that the Mino-modified coating is successfully fabricated on the PEEK surface, achieving sustained Mino release for up to 14 days. Among the three Mino concentrations, the PEEK-0.5Mino group demonstrates the best balance of antibacterial activity and biocompatibility, highlighting its potential for preventing IAIs in orthopedic and dental applications.
研究领域:
生物材料
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口腔医学
·
骨科
·
微生物学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 14
·7753-7760
·
IF 2.936
Handong Sun,Yunxia Lv,Chongyang Zhang,Xiaodan Zuo,Mengzhu Li,Xigui Yue,Zhenhua Jiang
A new monomer, 2,6-difluorophenyl-(4′-perfluorononenyloxy)phenyl-methanone (2F-PFN), was synthesized using a simple two-step reaction. A series of novel poly(ether ether ketone)s (PEEK-PFN-x) containing perfluorononenyl groups were then prepared from 2F-PFN, resorcin, and 4,4′-difluorobenzophenone by nucleophilic polycondensation. The resulting copolymers were found to have different electric and thermal properties depending on the molar ratio of perfluorononenyl groups. PEEK containing a 5% molar ratio of perfluorononenyl (PEEK-PFN-5) possessed an intrinsic low dielectric constant of 2.73 and low dielectric loss of 3.00 × 10−3 at 10 kHz. Another blended polymer prepared from PEEK and PTFE (PEEK/PTFE-5) possessed a dielectric constant of 3.21 and dielectric loss of 6.00 × 10−3 at 10 kHz. Therefore, PEEK/PTFE-5 had much higher dielectric loss than that of PEEK-PFN-5 with the same fluorine content. PEEK-PFN-5 also showed excellent thermal stability, with a 5 wt%-loss temperature of 436 °C. PEEK-PFN-5 showed a slight increase in hydrophobicity, with a water droplet contact angle of 89.7° compared with that of PEEK/PTFE-5 (86.4°) containing the same fluorine content as PEEK-PFN-5. Morphologies and fluoride distribution on the membrane surfaces were characterized by field emission SEM equipped with EDX. These results indicated that PEEK-PFN-5 possessed a more uniform distribution of fluorine on the membrane top surface than PEEK-PTFE-5.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Bing Liu,Yongzhong Jia,Zezheng Zhang,Huaxin Sun,Ying Yao,Yan Jing,Mixiang Qi,Quanyou Zhang
The solvent extraction separation of lithium isotopes has become of growing interest due to the need for 6 Li and 7 Li isotopes in the nuclear industry. A one-step synthesis of room temperature ionic liquid with low viscosity 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIm][NTf 2 ]) (with reaction yields of 87.47%) was used by the ultrasonic method. The addition of ionic liquid [EMIm][NTf 2 ] in the system significantly improved the extraction efficiency and separation factor compared to the traditional organic solvent anisole for extraction separation of lithium isotopes. The distribution ratio increased from 0.00145 (with the single stage separation factor of 1.024 ± 0.001) to 0.134 (with the single stage separation factor of 1.034 ± 0.001). Furthermore, a multi-stage extraction process was intended to enhance lithium isotope separation performance. Each stage of stripping can be considered as an extraction separation equilibrium process, in which the strip liquor from the load organic phase is used for separation in the next stage as the “original aqueous solution”. The abundance of 6 Li + gradually improved with an increase in the extraction stages. The relative abundance of 6 Li + increased by 1.492% at the 20-stage extraction separation (from 7.53% to 9.022%). This new and simple approach (stripping cross-flow multistage method (SCFM)) was to achieve large enrichment of lighter isotopes of lithium ( 6 Li + ) by combined extraction and stripping process. In summary, the present study offers the possibility for the enrichment of 6 Li + during lithium isotope extraction separation.
研究领域:
化学
·
核工业
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产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2019
·
IF 1.584
Yayun Zheng,Xing Yang,Meng Yuan,Jujie Luo
Two novel gas separation membranes (Phenyl(Ph)-poly(ether ether ketone)s (PEEKs) and PEEKs) based on PEEKs with a high fractional free volume were designed and synthesized. The structure and thermodynamic stability of the membranes were investigated using Fourier transform infrared spectroscopy, proton nuclear magnetic resonance spectroscopy, and thermogravimetric analysis. The two membranes, which were determined to be high-molecular weight polymers by gel permeation chromatography, showed good solubility in a weakly polar solvent. The gas transport properties of the Ph-PEEK membranes were investigated for different gases (CO2, O2, CH4, and N2) at 25°C and 1 atm. The Ph-PEEK-3 membrane with the largest free volume had the largest gas permeability coefficient and maintained good selectivity. The effect of operating temperature on the gas permeation of the Ph-PEEK-3 membrane was also investigated, and the maximum permeability of the four single gases was reached at 55°C and 1 atm.
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
JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 22
·2625-2633
·
IF 1.815
Zongshuang Cao,Li Qiu,Yongzhen Yang,Yongkang Chen,Xuguang Liu
The effects of surface modifications of multiwalled carbon nanotubes (MWCNTs) on their dispersibility in different solvents and poly(ether ether ketone) (PEEK) have been studied. MWCNTs were treated by mixed acids to obtain acid-functionalized MWCNTs. The acid-functionalized MWCNTs were modified with five different chemical agents separately, 1,6-diaminohexane, hexadecyltrimethyl ammonium bromide, silane coupling agent 3-aminopropyltriethoxysilane, anhydrous sulfanilic acid, and ethanolamine. Multiwalled carbon nanotube and PEEK (MWCNT/PEEK) composite films were fabricated to explore systematically the dispersibility of differently modified MWCNTs in PEEK as well as in different solvents. The morphology and structures of MWCNTs and the compatibility between MWCNTs and PEEK have been investigated. It was observed that the MWCNTs modified with anhydrous sulfanilic acid have an excellent dispersion in the PEEK grafted by sulfonic acid groups and that the MWCNTs modified with ethanolamine are also dispersed well in pure PEEK. The results herein provide useful insights into the development of MWCNT/PEEK composites for a wide variety of applications.
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 MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2483-2501
·
IF 4.682
Chen Yuan,Zhang Shengchang,Jiang Chunhui,Zhong Tianhaoyue,Su Zexi,Xu Qibin,Jiang Mengjin,Liu Pengqing
In order to prevent secondary pollution due to the photocatalyst titanium dioxide (TiO 2 ) used in industrial wastewater treatment, and to boost the photo-removal efficiency TiO 2 was immobilized on the surface of high-performance poly (ether ketone) (PEEK) hollow fiber membrane via an in-situ grafting reaction. γ -Methylacryloyloxypropyltrimethoxysilane (MAPS) was used as a coupling agent to link the PEEK hollow fiber membranes with TiO 2 under UV radiation and hydrothermal treatment. The surface chemical structure, surface morphologies, and permeability of the PEEK-PMAPS-TiO 2 membranes were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), and the water flux test. The performance of PEEK-PMAPS-TiO 2 membranes in terms of their ability to accelerate the photo-removal of different dyes was investigated under a range of pH conditions. Experimental results showed that the photo-degradation efficiency for tartrazine can be reached 100% (after 4 h of UV radiation at pH of 3.5) with a TiO 2 grafting degree of 15.56 wt% on the composite membranes. We also find that the acidic/alkaline condition accelerates the processes of absorption and photo-removal of negatively/positively charged dyes. In addition, the recyclability of the PEEK-PMAPS-TiO 2 membrane was also investigated. After refreshing treatment, the second photo-removal efficiency still reached over 95%. Graphical abstract
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
International Journal of Refrigeration
·
2019
·
IF 3.177
Tao Jia,Shengshan Bi,Jiangtao Wu,Panyuan Li
Experimental solubilities of difluoromethane (R32) in polyol ester (POE), polyvinylether (PVE), and polyalkylene glycol (PAG) base oils were measured in the temperatures range from 273 K to 351 K based on the isochoric method. The experimental setup was checked by measuring the solubility of carbon dioxide in n -decane at pressures from 0.1 to 4.6 MPa. The expanded uncertainty ( k = 2) of the measured solubility data was estimated to be less than 2.8%. The experimental solubility data were correlated using the Peng–Robinson (PR) equation of state (EOS) and Wilson activity coefficient model. The absolute average deviations of the experimental data and calculated values for R32 in POE, PVE, and PAG base oils were 1.74%, 0.73%, and 0.97%, respectively. The solubility of R32 in three base oil were calculated and compared at same temperatures and pressures, and the results showed that the solubility order of R32 in the three base oils was: PAG > PVE > POE.
研究领域:
化学工程
·
制冷技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2021
·
IF 3.902
Chang Chen,Lihui Meng,Yanru Hu,Zhengnan Su,Tiantian Zhang,Zhiyuan Ouyang,Wenchao Li,Jiangling Wan,Qingzhi Wu
The control of interfacial interaction between polymers and fillers is essential for the fabrication of high-performance polymer composites. In this work, poly(ether-ether-ketone)/silica (PEEK/SiO 2 ) and PEEK/SiO 2 /graphene oxide (GO) composite were prepared by ball milling-ultrasonic dispersion combined with melt extrusion injection molding . GO nanosheets were introduced as the interfacial enhancer to improve interfacial binding between SiO 2 and PEEK. Mechanical tests showed that the incorporation of SiO 2 and GO greatly optimized the modulus, strength , and fracture toughness of the composites. The tensile strength and Young's modulus of the PEEK/SiO 2 composites increases with the increase of SiO 2 content. The maximum tensile strength and Young's modulus of the PEEK/SiO 2 composites are approximate 95.9 ± 0.6 MPa and 4.007 ± 0.005 GPa at 30 wt% of SiO 2 , an increase of 6.4% and 21.2% than that of pure PEEK. The maximum tensile strength and Young's modulus of the PEEK/SiO 2 /GO composite are further improved to approximate 101.5 ± 0.7 MPa and 4.62 ± 0.08 GPa at a GO content of 1.5% wt, which is 12.6% and 39.4% higher than that of pure PEEK. In addition, SEM images show that numerous HA formed on the surface of the PEEK/SiO 2 /GO composite after immersion in SBF for 7 days, and the HA layer becomes gradually thicker after 14 days, implying the good osteogenic activity of PEEK/SiO 2 /GO composites. Therefore, these results suggest that the use of GO as a novel filler surface modifier for the preparation of high-performance composites may become a novel interfacial design strategy for the development of high-performance composites.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2023
·
IF 9.9
Qi Zhao,Lina Wang,Jianhui Liu,Guohui Xu,Haicheng Jiang,Xingming Jie,Yiming Cao
Nano-porous poly(ether ether ketone) (PEEK) hollow fiber membranes were successfully fabricated from PEEK/polyetherimide (PEI) blends via thermally-induced phase separation (TIPS) followed by chemical extraction of PEI method. The gas permeation rates , morphologies and mechanical properties of membranes were systematically investigated under different spinning conditions. The content of PEEK in blends substantially determined the gas permeation rates following the order: PEEK30/PEI70 (~9000 GPU) > PEEK40/PEI60 (~5100 GPU) > PEEK50/PEI50 (~1700 GPU) > PEEK60/PEI40 (~300 GPU) > PEEK70/PEI30 (below 1.0 GPU). Faster winding rates and bigger N 2 bore fluid flow rates would result in bigger pores, higher porosity and larger gas permeation rates, while would cause lower mechanical strength. Furthermore, the silane-grafted hydrophobic PEEK hollow fiber membranes were successfully prepared via one-step reduction followed by silane modification. The performance of virgin and modified membranes was evaluated by treating saline feed containing 3.5 wt% sodium chloride in vacuum membrane distillation (VMD) process. Compared with virgin PEEK membrane, the modified membranes exhibited a more stable flux and higher salt rejection over 99.9 % for 33 h, indicating the significant improvement in the anti-wetting property caused by silane modification. The application attempt expands the research direction of PEEK membranes and promotes its further application potential in VMD process.
研究领域:
材料科学
·
膜技术
·
海水淡化
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2023
·Vol. 13
·期 7
·1147
·
IF 3.4
Yue Guo,Xuhui Chen,Guorong Wu,Shiwen Huang
In this study, a series of composites comprising polyether ether ketone (PEEK) and carbon fiber (CF)-reinforced polybenzoxazine for high-temperature friction materials for vehicle brake applications were developed using a high-temperature compression molding technique. The objective of this research was to systematically investigate the thermal, mechanical (tensile and flexural), and tribological performance of friction materials made from polybenzoxazine-based composites by varying the PEEK/CF mass ratio. Our study reveals the substantial improvement effect of the increased content of PEEK fibers on the thermal conductivity, the coefficient of friction, and the friction strength of the polybenzoxazine-based composite materials. Meanwhile, the introduction of carbon fibers was found to have a monotonic positive effect on the mechanical (tensile and flexural) properties and wear performance of the polybenzoxazine-based composites. The polybenzoxazine-based composites exhibit high mechanical strength, with a tensile strength of 50.1–78.6 MPa, Young’s modulus of 10.2–24.3 GPa, a flexural strength of 62.1–88.3 MPa, and a flexural modulus of 13.1–27.4 GPa. In addition, the polybenzoxazine-based composite with a PEEK/CF mass ratio of 75:25 exhibits a high and stable coefficient of friction (0.33) and a specific wear rate (1.79 × 10−7cm3/Nm at room temperature). Subsequent to the wear test at ambient temperature, the worn surfaces of five polybenzoxazine-based composite samples with various PEEK/CF mass ratios were studied using electron microscopy technology (SEM). The observation of small cracks and tiny grooves on the worn surfaces indicates a combined abrasive and adhesive wear mechanism of the material. Our experimental results clearly reveal superior mechanical properties and excellent tribological characteristics. As a result, these composites show promising potential for the application of friction materials in terms of vehicle braking system applications.Keywords:polybenzoxazine-based composite;PEEK;carbon fiber;friction material
研究领域:
材料科学
·
机械工程
✓ 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）