POLYMER INTERNATIONAL
·
2020
·Vol. 70
·期 3
·282-287
·
IF 2.574
Jiaxin Wei,Yingshuang Shang,Da Xu,Zhaoyang Wang,Zilong Jiang,Yanwei Gao,Haibo Zhang
A series of novel poly(ether ketone) copolymers with different contents of fluorene groups were synthesized. The effects of fluorene group content on the thermal and mechanical properties of poly(ether ketone) copolymers were investigated. The introduction of a low content of fluorene groups can lead to an increase in glass transition temperature, thermal stability and heat deflection temperature. Among them, the heat deflection temperature of 10% fluorene-containing poly(ether ketone) copolymers (PEK-FD10) increases from 178 °C (pure poly(ether ketone)) to 196 °C, which means that the material has a higher heat resistance rating. Compared with poly(ether ketone)s, these copolymers have excellent mechanical properties. When the content of fluorene groups is only 2% (PEK-FD2), the strength is significantly improved. And the flexural strength of PEK-FD2 is 149.3 MPa, which is 12% higher than that of poly(ether ketone). It is worth noting that the fracture toughness and impact toughness are also increased significantly. The strain at break of PEK-FD2 is up to 88% and the impact toughness of PEK-FD2 is 54.6 J m −1 . This suggests that the introduction of minute contents of fluorene groups can simultaneously increase the strength and toughness. © 2020 Society of Industrial Chemistry
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
HIGH PERFORMANCE POLYMERS
·
2020
·
IF 1.568
Hong Li,Hang Su,Letian Wang,Lingyu Sun,Jiping Yang
The difficult forming process and construction caused by high viscosity has been the main problem restricting the application of high-performance thermoplastic/epoxy blends. In this contribution, low viscous polyetherketone (PEK)/diglycidyl ether of bisphenol A epoxy resin (DGEBA) blends were prepared by mixing the ultrafine PEK powder and DGEBA monomer at ambient temperature. Rheological behaviour shows that complex viscosity of the undissolved blends containing 20 wt% PEK powder is two orders of magnitude lower than that of the dissolved one. Interestingly, diffusion and phase separation of PEK powder in the undissolved PEK/DGEBA/2-methylimidazole/dicyandiamide (M-DICY) blends are affected by the curing processes. Phase-inverted morphology was observed after curing at 120°C/1h + 160°C/0.5 h for the undissolved 20 wt% PEK/DGEBA/M-DICY blends which also exhibited outstanding tensile strength and lap shear strength both at 298 and 77 K. We believe this work should provide a new insight into the preparation of advanced thermoplastic/epoxy blends.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2018
·
IF 3.483
Cuihong Jin,Xiuling Zhu,Shuai Zhang,Shuai Li
In this work, a series of long flexible alkylsulfonated side chains poly (phthalazinone ether ketone) (SFG-PPEK-x) are successfully synthesized through polycondensation , demethylation , and sulfobutylation grafting reaction to the polymer backbone. The resulting ionomers could dissolve in polar aprotic solvents , such as DMSO , NMP etc and show excellent film-forming properties. Furthermore, the effect of side chain lengths on the properties of the resulting PEMs, such as proton conductivity, water uptake, and swelling ratio are investigated systematically. The SFG-PPEK-4 membranes (IEC = 1.70 mmol g −1 ) show the highest proton conductivity in the range of 107 mS cm −1 at 30 °C and 184 mS cm −1 at 80 °C, which is higher than that of Nafion ® 115. The thermal, mechanical properties and chemical stability of SFG-PPEK-x are discussed, systematically.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2009
·Vol. 287
·期 4
·495-500
·
IF 1.736
Wang Chen-Yi,Li Peng-Hui,Li Guang,Jiang Jian-Ming
A series of novel fluorinated poly(ether ketone amide)s (PEKAs) were prepared from an unsymmetrical aromatic diamine, (4′-(4″-amino-2″-trifluoromethylphenoxy)-3′,5′-dimethylphenyl)(4-aminophenyl)-methanone ( 1 ), with various aromatic dicarboxylic acids using the phosphorylation polycondensation technique. The PEKAs had inherent viscosities ranging from 0.43 to 0.65 dl/g. All the fluorinated PEKAs could be soluble in many polar organic solvents such as N -methyl-2-pyrrolidinone (NMP), N,N ′-dimethylacetamide (DMAc), N,N ′-dimethylformamide (DMF), dimethyl sulfoxide (DMSO), and tetrahydrofuran (THF). Flexible and tough polymer films could be prepared by casting from DMAc solvent. The PEKA films exhibited high optical transparency with a cutoff wavelength of 354–365 nm and good mechanical properties with tensile strengths of 78–98 MPa and elongations at break of 11.5–18.5%. They showed glass-transition temperatures in the range of 288−323 °C and the onset decomposition temperatures in the range of 450−461 °C in nitrogen atmosphere. Meanwhile, the PEKA films possessed low dielectric constants of 1.98–2.71 at 1 MHz and low moisture absorption (<2%). Due to their properties, the fluorinated PEKAs could be considered as photoelectric and microelectronic materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Heguo Han,Zheng Liu,Huiting Yu,Yuxuan Sun,Shenghai Li,Suobo Zhang
For thin-film composite (TFC) membranes applied in organic solvent nanofiltration (OSN), enhancing the adhesion between the active layers and the substrates can effectively improve the stability of the membranes. In this work, TFC OSN membranes with polyetherketone bearing amino group (PEK-NH 2 ) asymmetric substrates and amino-contained polyarylate active layers were fabricated by interfacial polymerization technique, and subsequently reacted with dialdehydes to form crosslinking between and within the substrates and the active layers. Crosslinking improved both of the solvent resistance of the substrates and the separation selectivity of the active layers. In addition, reverse pressure testing demonstrated that crosslinking allowed the active layers to adhere more strongly to the substrates. The optimized integrally crosslinked membranes exhibited methanol permeance of 10.4 L m −2 h −1 bar −1 and a molecular weight cut-off of about 320 g mol −1 in methanol. Moreover, the integrally crosslinked membranes maintained good stability for OSN operation in methanol for 12 days, and also exhibited unchanged OSN performance after soaked in N,N -dimethylformamide for 2 days. This work demonstrated a novel solvent-resistant membrane material and membrane-fabrication strategy with prospect for OSN application.
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 MEMBRANE SCIENCE
·
2024
·
IF 8.4
Ge Chao,Zhiguang Zhang,Zixin Lv,Erqiang Yang,Ruofei Gao,Qing Ju,He Gao,Chengyuan Niu,Huidong Qian,Kang Geng,Nanwen Li
The ether-free aromatic polymer electrolytes have the potential to be used as proton exchange membranes (PEMs) and binders materials in fuel cells. Nevertheless, it is still a technical challenge to improve their mechanical and chemical stability. Here, we prepared a series of quantitatively sulfonated poly(oxindole biphenylene) polymers with common substituent groups (SPOBP n -RPOBP (100-n) , R=F, Cl, Br and NO 2 ) by simply copolymerization. Substituent groups occupy highly active sulfonation sites of polymer, so the sulfonation degree of the polymer is greatly reduced. They show limited water uptake (33–35 wt%) and swelling ratio (10–13 %) compared with fully sulfonated SPOBP 100 (water uptake of 366 wt% and swelling ratio of 78 %) at 80 °C. Thus, the voltage of single-cell assembled with SPOBP 50 -FPOBP 50 membrane remains stable for 90 h at 0.3 A/cm 2 , much higher than that of SPOBP 100 (20 h). Moreover, the cells exhibit similar lifetime trends using it as binder materials in catalyst layer. These results indicate that it is possible to prepare electrolyte with controllable sulfonation degree and high stability by post-sulfonation on copolymers containing substituent groups.
研究领域:
材料科学
·
能源工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Applied Sciences-Basel
·
2018
·Vol. 8
·期 5
·770
·
IF 1.689
Peng Lu,Yong Cao,Xiaolan Wang
Macroporous cardo polyetherketone (PEK-C) powder catalyst bearing covalently ionic liquids (PEK-C-ILs) was prepared, it exhibited a high catalytic performance for biomass hydrolysis. A hydrolysis mechanism of inulin over this new catalyst was proposed as well. The influences of degree of chloromethylation of PEK-C, catalyst dosage, reaction temperature, pore size of PEK-C-ILs and inulin concentration were investigated. A high conversion of inulin of 99.7% was obtained under the optimal reaction conditions. Meanwhile, the hydrolysis kinetics was studied under different conditions. The proposed kinetic model of inulin hydrolysis catalyzed by PEK-C-ILs was established and it successfully predicted the inulin hydrolysis in wider ranges of experimental conditions. The results demonstrated that the catalytic inulin hydrolysis performance of PEK-C-ILs is better than that of homogenous ILs due to that there was a high-density spatial distribution of active sites on the surface and inner pore wall of PEK-C after the ILs was immobilized. Furthermore, the stability including chemical structure and physical appearance and reusability tests showed that PEK-C-ILs catalyst could be effectively separated and recovered from hydrolysates and has excellent reusability. Importantly, using the PEK-C-ILs as catalyst makes the recycling of ILs simplified, efficient and the hydrolysis process more economical. At the same time, it avoided the potential hazards of homogenous ILs to the environment. Therefore, it is a kind of green catalyst with potential application prospect in many catalysis fields.Keywords:cardo polyetherketone;ionic liquids;immobilization;macroporous powder catalyst;inulin hydrolysis
研究领域:
化学工程
·
生物质能
·
催化科学
✓ 已验证
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Jiawei Liu,Tongjia Zhang,Lixin Song,Guangyuan Zhou,Honghua Wang
Incorporating reactive groups that can participate in epoxy cross-linking into traditional thermoplastic toughening agents enhances the interfacial compatibility between thermoplastic and thermosetting resins, thereby improving the impact toughness of the system. In this study, hydroxyl end groups were integrated into phenolphthalein polyether ketone (PEKC) molecular chains to engage in the cross-linking reaction during epoxy curing, significantly enhancing the toughening effect on the epoxy system. The results indicate that hydroxyl-terminated phenolphthalein polyether ketone (PEKC-OH) of various molecular weights can enhance the impact strength of the epoxy system (E51/MTHPA). Among these, the PEKC-OH-2 resin exhibited the optimal toughening effect at an addition level of 10 phr, increasing the impact strength from 11.85 to 23.46 kJ/m 2 , representing a 98% improvement, without compromising the operating temperature and mechanical properties of the epoxy system. Additionally, kilogram-scale toughening agent resins were produced through scale-up experiments of PEKC-OH-2 in a 50-L polymerization reactor, validating its applicability for industrial epoxy toughening. In summary, the PEKC-OH synthesized in this study serves as an efficient reactive thermoplastic toughening agent, offering ease of preparation, industrial producibility, and considerable application potential. Highlights Novel hydroxyl-terminated phenolphthalein polyether ketone (PEKC-OH). Reactive hydroxyl end groups improved compatibility with epoxy resin. PEKC-OH formed an interpenetrating network with epoxy, boosting impact toughness. Scaled-up of PEKC-OH-2 in a 50-L reactor for industrial production. PEKC-OH is feasible to prepare and has great application prospect.
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
HIGH PERFORMANCE POLYMERS
·
2014
·
IF 1.09
Yunliang Guo,Shuling Zhang,Lilong Yang,Feng Li,Wenlei Li,Yinlong Du,Guibin Wang
An amphiphilic hyperbranched rod-coil copolymer was synthesized by grafting linear poly (ethylene glycol) (PEG) onto hydroxyl-terminated hyperbranched poly (aryl ether ketone) (OH-HPAEK). The molecular structure, the number-average molecular weight and the thermal properties of HPAEK-block-PEG were confirmed and characterized using proton nuclear magnetic resonance, Fourier transform infrared spectroscopy, gel permeation chromatography, differential scanning calorimetry, and thermogravimetric analysis, respectively. The microspheres of HPAEK-block-PEG were fabricated by the method of self-assembly, and the morphology and diameter of the obtained microspheres were characterized using transmission electron microscopy, scanning electron microscopy, and dynamic light scattering. The heat-treated experimental results demonstrated that the polymer microspheres possessed excellent thermal property that could stably exist even if heated at 130°C for 10 h. In addition, the diameter of the microspheres can be easily controlled by just adjusting the concentration of the copolymer.
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
Journal of Functional Biomaterials
·
2022
·Vol. 13
·期 4
·220
·
IF 4.901
Wenhsuan Lu,Conglei Li,Jian Wu,Zhongshi Ma,Yadong Zhang,Tianyi Xin,Xiaomo Liu,Si Chen
Here, we developed a new synthetic method for the production of a new class of polymeric inorganic hybrid biomaterial that has potential for dental implant applications and, in general, other orthopedic applications owing to its excellent mechanical properties and biomechanical compatibility. The new hybrid biomaterial is a composite consisting of polyetherketoneketone (PEKK) and hydroxyapatite (HA). This hybrid material boasts several unique features, including its high HA loading (up to 50 wt%), which is close to that of natural human bone; the homogeneous HA distribution in the PEKK matrix without phase separation; and the fact that the addition of HA has no effect on the molecular weight of PEKK. Nanoindentation analysis was used to investigate the mechanical properties of the composite, and its nano/microstructure variations were investigated through a structural model developed here. Through nanoindentation technology, the newly developed PEKK/HA hybrid biomaterial has an indentation modulus of 12.1 ± 2.5 GPa and a hardness of 0.42 ± 0.09 GPa, which are comparable with those of human bone. Overall, the new PEKK/HA biomaterial exhibits excellent biomechanical compatibility and shows great promise for application to dental and orthopedic devices.Keywords:polyetherketoneketone;hydroxyapatite;composite;hybrid;dental;orthopedic;orthodontic;high performance;mechanical compatibility
研究领域:
生物医学工程
·
材料科学
·
牙科研究
·
骨科研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Shuo Wang,Pei Wang,Yunlong Sun,Jiyong Zhao,Zhipeng Wang
The rapid advancement of high-frequency communication networks has imposed more rigorous demands on the overall characteristics of dielectric materials. Poly(aryl ether ketone)s (PAEKs) are good candidate materials for applications in microelectronic devices due to their excellent thermal stability, mechanical properties, and chemical stability. In this work, we endeavored to incorporate large-volume fluorene structures into fluoro-PAEKs, employing strategies to enhance the polymer free volume and reduce polarizations in order to decrease the values of Dk and Df at high frequency. Therefore, a series of poly(ether ketone) (PEK-pOCFBPF-X) copolymers were designed and synthesized through nucleophilic polymerization using 4,4-difluorobenzophenone (DFK), phenolphthalein anilide-containing trifluoromethoxy groups (PPPBP-pOCF3), and a structurally ordered bisphenol fluorene (BPF) as the monomers. The results demonstrate that the introduction of BPF into fluoro-PAEKs resin leads to a low dielectric constant (2.713–2.782@10 GHz) and dielectric loss (0.00597–0.00825@10 GHz), as well as exceptional thermal properties (Tg = 232–240 °C, Td5% = 518–536 °C). Moreover, the copolymer exhibits high mechanical strength (tensile strength ≥ 81 MPa), minimal water absorption (≤0.0063), and excellent solubility. The incorporation of trifluoromethoxy and fluorenyl groups into copolymers significantly enhances the free volume fraction (5.5%–5.8%), resulting in a lower density and reduction in the dielectric constant. Simultaneously, by introducing C–F bonds with lower polarizability, the overall polarizability of the polymer is effectively diminished. These fluoro-PAEKs films, which exhibit superior thermal stability and a low dielectric constant, have great potential for applications in the high-performance flexible electronic packaging field and communication usage.
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
POLYMER
·
2024
·
IF 4.1
Huiting Yu,Xi Sun,Zheng Liu,Heguo Han,Jianhang Qiu,Qifeng Zhang,Yuxuan Sun,Shenghai Li,Suobo Zhang
Semi-crystalline poly (ether ketone) (PEK) materials with intrinsic solvent resistance are ideal materials for the preparation of organic solvent nanofiltration (OSN) membranes. Although some precursor materials have been developed for soluble processing through group protection strategies, these precursors are difficult to hydrolyze, limiting their practical applications. In this work, we designed an easily hydrolyzable N-cyclohexyl-poly (ether ketone ether imide) (CYH-PEKEI) precursor that could be converted to PEK by acid treatment at 80°C within 1 h. The results showed that the prepared membrane was stable in various organic solvents, with a permeance of 1.29 L m −2 h −1 bar −1 in N, N-Dimethylformamide (DMF), a molecular weight cutoff of 320 g/mol, and good long-term operational stability. Additionally, the membrane demonstrated excellent aging resistance during variable temperature DMF operation. This work has stimulated the potential of PEK membranes for OSN applications by optimizing the precursor structure.
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
危险品化学品经营许可证（带存储）