Additive Manufacturing
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2022
·
IF 11.632
Qinfei Xu,Wenhan Xu,Yang Yang,Xin Yin,Chenyi Zhou,Jinxuan Han,Xuefeng Li,Yingshuang Shang,Haibo Zhang
3D printed poly (ether ether ketone) (PEEK) parts have attracted considerable attention in the automotive, medical, and aerospace fields in the past two decades. However, the major obstacle to its further application is weak interlayer strength and severe mechanical anisotropy. Herein, amorphous poly (aryl ether ketone) (aPAEK) was designed as an interlayer reinforcement modifier to strengthen the interlayer strength and reduce mechanical anisotropy of 3D printed PEEK parts. By introducing 7 wt% aPAEK in PEEK filaments, the interlayer strength in 3D printed parts increased 130% from pristine PEEK to aPAEK/PEEK blends. The mechanical anisotropy in the XY plane was reduced to 1.1%, and its X-axis and Y-axis tensile strength still reached 89.2 ± 3.3 MPa and 88.1 ± 4.1 MPa, respectively. We demonstrate that these performance enhancements were due to the diffusion and entanglement of aPAEK between the layers. These remarkable results significantly improve the comprehensive mechanical properties of 3D printed PEEK parts, and expand its high-performance applications. This work also yields new insight into the development strategy of additive manufacturing materials by blending.
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高影响因子
ACS Omega
·
2022
·
IF 4.132
Guoqing Wu,Dongjiu Zhang,Wei Xu,Hongjun Zhang,Likun Chen,Yongchao Zheng,Yi Xin,Hong Li,Yan Cui
Chemical warfare agents (CWAs) can be absorbed in polymeric coatings through absorption and permeation, thus presenting a lethal touch and vapor hazards to people. Developing a highly impermeable polymer coating against CWAs, especially against organophosphate CWAs (OPs), is challenging and desirable. Herein, fluorinated epoxy (F-EP) and epoxy (EP) coatings with different cross-link densities were prepared to resist OPs. The effects of the polymer coating structure, including cross-link density, chemical composition and free volume, on the chemical resistance to dimethyl methylphosphonate (DMMP, Soman simulant) were investigated in detail. Meanwhile, the chemical resistance to Soman and VX was examined. The results reveal that the cross-link density is a critical factor in determining the chemical resistance of the coatings. Highly cross-linked EP and F-EP coatings with dense and solid cross-linked networks can fully bar DMMP and OPs permeation during the test time. At low or medium cross-link densities, the EP coating with a lower retention of DMMP exhibited a higher resistance than the F-EP coating due to the lower interaction with DMMP and smaller free-volume holes and lower relative fractional free volume. These results suggest that increasing the cross-link density is a reasonable approach to control the chemical resistance of polymer networks against OPs.
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高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2022
·
IF 9.463
Shuai Yang,Yang He,Yanju Liu,Jinsong Leng
In this paper, we synthesized the shape memory poly(aryl ether ketone) (PAEK) and fabricated the radially oriented CNTs enhanced PAEK composite actuators. The introduction of highly aligned CNTs endowed PAEK matrix great thermal stability, good mechanical properties, and excellent shape memory effect. The formation of CNTs conductive path in PAEK matrix was instrumental in improving thermal and electrical conductivity, promoting efficient heat/electric dual triggered shape memory effect with high recovery ratio, rapid shape recovery and low triggering voltage. In addition, we used aligned CNTs/PAEK composites with 15 wt% CNTs as voltage actuators, and designed the two kinds of voltage actuators (angle-mode and time-mode) to achieve the different actuating actions via the applied voltage (range from 8 V to 50 V). These efficient composite voltage actuators exhibited the excellent stability and durability in continuous voltage actuating, which were expected to open door for smart actuators and electronic devices.
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高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Shuai Yang,Yang He,Jinsong Leng
We synthesized shape memory poly(aryl ether ketone) (PAEK) and grafted carboxylic acid pyridine zwitterions onto the main chains for fabricating the zwitterionic PAEK (ZPAEK) material. ZPAEK exhibited a Tg of around 120 °C, great thermal stability, and mechanical performances, and heat-triggered shape memory behaviors, including high shape recovery ratio (over 98.7%) and fixity ratio (over 98%). Besides, we improved the hydrophilicity of PAEK by incorporating carboxylic acid pyridine zwitterions, for the first time, achieving the exceptional water-actuated shape memory behaviors for PAEK at room temperature. Furthermore, the controllable reconfiguration behaviors were achieved through the interaction between carboxylic acid pyridine zwitterions and water molecules. For the sample of any temporary shape, after absorbing water, its previous original shape was eliminated, and the deformed temporary shape could be redefined as the “original” shape to construct an unprecedented shape memory cycle, never returning to the first original shape. Additionally, the excellent triple shape memory behaviors of sample were obtained after absorbing water. After the programmable shape fixation processes, the sample of temporary shape could recover to the original shape through the two stages: one was at 110 °C, and the other was at 140 °C. We did believe the water-actuated, reconfigurable, and triple shape memory ZPAEK could be an ideal substitute material for smart sensors and actuators.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Li Chen,Tahir Maqbool,Ghazanfar Nazir,Congyu Hou,Yulong Yang,Jianning Guo,Xihui Zhang
Endocrine disrupting compounds (EDCs) in the aquatic systems are of growing concerns that could undermine drinking water safety. In this study, manganese (III) oxide (Mn 2 O 3 ) based catalytic ceramic membrane (CCM) was developed for the activation of peroxymonosulfate (PMS), and its applicability has been tested in degrading the ten different EDCs (including bisphenol analogs (BPs)) in drinking water. The CCMs were synthesized at different calcination temperatures i.e., 850, 950, and 1150 °C. Optimal performance of CCMs/PMS was achieved at a higher degree of calcination. The CCMs/PMS has shown a potential to effectively degrade the EDCs at higher concentrations (mg/L) to trace levels (ng/L). The CCMs/PMS system adopted a non-radical pathway of degrading the EDCs through the extensive generation of singlet oxygen ( 1 O 2 ), as confirmed using quenching experiments and electron paramagnetic resonance (EPR) spectroscopy. 1 O 2 -based oxidation process showed special selectivity for the decontamination of phenols and bisphenols. The long-term performance of CCMs/PMS showed good stability in degradation of the EDCs in drinking water, also with efficient mineralization (TOC removal >55%) and negligible release of Mn (0.004 wt%Mn/min). CCMs/PMS system also showed high potential in improving water quality by reducing the disinfection byproducts (DBPs) formation potential, highest recorded for bromodichloromethane (CHCl 2 Br, 100%) and lowest for dichloroacetic acids (TCAA, ∼50%). The study provided a highly efficient catalytic ceramic membrane based advanced oxidation process (AOPs) for effective degradation multiple of EDCs in drinking water, and the findings of this work can be a baseline for full-scale water treatment applications.
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ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Shuai Yang,Yang He,Jinsong Leng
Reversible dynamic bonds are able to crack and recombine upon external stimuli, which endow polymers with exceptional self-healing, reprocessing, and reversible deformation ability. In this paper, we integrated the metal coordination bonds into shape memory poly(aryl ether ketone) (PAEK) to fabricate smart materials with multifunctionalities. Through tuning the metal ion content and species, the enhancement of shape memory behaviors was achieved, including the high recovery ratio (over 98%) and fixity ratio (over 98%), which was closely related to the synergic effect of the intrinsic motion ability of PAEK matrix and the cracking-recombination of coordination bonds. Besides, through the combination of the components with different Cu2+ contents, in addition to the components with Fe2+ coordination bonds, we fabricated the gradient shape memory structures with controllable shape memory and recovery behaviors. The manipulation of gradient coordination bonds resulted in different shape recovery speeds and directions. Furthermore, due to the dynamic cracking-recombination of coordination bonds, the metal-coordinated PAEK material exhibited the great self-healing and reprocessing performances, which were significant for largely extending its application range.
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高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Jinghan Guo,Boyao Zhou,Shuangying Li,Yayan Tong,Zhi Li,Menghua Liu,Yanhui Li,Tongxu Qu,Qingxiang Zhou
Present work depicted a novel electrochemical sensor fabricated with magnetic carbon dots (M-CDs) and cetyltrimethylammonium bromide (CTAB) modified glassy carbon electrode (GCE) for selective measurement of 3,3′,5,5′-tetrabromobisphenol A (TBBPA) in beverages. The M-CDs composite material revealed good electrocatalytic activity, and CTAB has strong hydrophobic interaction which enable it have good enrichment capacity of hydrophobic compounds, and combination of them further enhances the electrochemical signal. Hence CTAB decoration can markedly improve the detection performance of TBBPA. Electrochemical properties of the fabricated sensor was investigated through performing cyclic voltammetry (CV). The morphology and functional groups of the modified materials were examined with transmission electron microscope (TEM) and Fourier transform infrared spectroscopy (FTIR). The results indicated that the synthesized material had a spherical-like structure, good dispersion properties and plenty of functional groups on the surface. The effects of incubation potential, incubation time, pH of electrolyte, and scanning rate on oxidation peak current were investigated. Under optimal conditions, the designed sensor had good linear range of 1 nM–1000 nM, and the detection of limit of the constructed sensor was 0.75 nM. The constructed sensor was utilized to detect TBBPA in vitamin water, scream drink and genki forest, and satisfactory detection performance had been achieved.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
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IF 10.383
Hao Zhang,Fei Xie,Zhang Zhao,Noor Ul Afsar,Fangmeng Sheng,Liang Ge,Xingya Li,Xiwang Zhang,Tongwen Xu
Tuning the crosslinking density of interfacial-polymerized nanofiltration (NF) membranes varying from loose to dense structures can make them meet the demand of various applications. The properties (e.g., pore size and porosity) of NF membranes can be tuned by choosing monomers with different structures and reactivities. Herein, tris(hydroxymethyl)aminomethane (THAM), a low-cost and green monomer, is first employed for the preparation of poly(ester amide) (PEA) thin-film composite membranes via interfacial polymerization. The moderate reactivity of THAM enables rational regulation of the crosslinking density of PEA membranes from loose to dense structures by varying the THAM concentration, which can hardly be achieved for traditional polyamide or polyester membranes. The developed PEA membranes with a wide tunability range of crosslinking densities broaden their potential utility in NF. PEA membranes with dense structures show exceptional desalination performance with a water permeance of 11.1 L m–2 h–1 bar–1 and a Na2SO4 rejection of 97.1%. However, loose PEA membranes exhibit good dye/salt separation performance with a dye removal rate over 95.0% and negligible NaCl rejection (<7.5%), as well as high water permeance (>45 L m–2 h–1 bar–1). This work implies that PEA membranes with tunable crosslinked structures provide new possibilities for the development of task-specific separation membranes.
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高影响因子
JOURNAL OF SEPARATION SCIENCE
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2022
·Vol. 45
·期 9
·1493-1501
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IF 3.614
Chengjiang Zhang,Hongmei Yuan,Zeyi Lu,Yuhuang Li,Lirong Zhao,Zhuomin Zhang,Gongke Li
Covalent organic frameworks with tunable porous crystallinity and outstanding stability have exhibited fascinating pretreatment performance as ideal extraction media. Herein, the β-ketoenamine-linked TpPa-1 synthesized by 1,3,5-triformylphloroglucinol and paraphenylenediamine was employed as the absorbent for online micro-solid phase extraction of trace bisphenols combined with high-performance liquid chromatography detection. A series of characterizations indicated that the TpPa-1 possessed large surface areas, high stability, and hydrophobicity. The main experimental parameters affecting the extraction efficiency were optimized in detail. Compared with four commercial sorbents, the TpPa-1 exhibited superior enrichment capacity for extracting bisphenols. Under the optimum conditions, the established method demonstrated a wide linear range and high sensitivity with the limit of detection ranging from 0.05–0.06 μg/L. Furthermore, the developed method was successfully applied to determine bisphenols in plastic samples. Bisphenol A was actually detected in a transparent box with a concentration of 0.31 μg/g, and the recoveries of the four bisphenols in the plastic samples were 80.5–116% with the relative standard deviation less than 9.2%. Such performance was attributed to recognition affinity, including the π-π affinity, hydrophobic effect, and hydrogen bond. These results demonstrated that TpPa-1 possessed great potential to be an excellent pretreatment medium for online separation and analysis of trace analytes in complex samples.
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高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2022
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IF 7.926
Gaofeng Zhou,Yongsheng Fu,Runyu Zhou,Li Zhang,Linyue Zhang,Jiewen Deng,Yiqing Liu
In this study, a novel heterogeneous peracetic acid (PAA)-based advanced oxidation process (AOP), viz. cobalt ferrite combined with PAA (CoFe 2 O 4 /PAA), was used to degrade organic contaminants . The best pH for rhodamine B (RhB) degradation in CoFe 2 O 4 /PAA system was at 7, and approximately 95% RhB could be removed within 10 min at this pH. Radical scavenging experiments indicated that organic radicals (i.e., CH 3 COO • and CH 3 COOO • ) were the dominant reactive species for RhB degradation. The X-ray photoelectron spectroscopy (XPS) analysis for the fresh and used catalysts suggested that the catalytic reaction mainly occurred on the surface of the catalyst. Increasing PAA dosage and CoFe 2 O 4 dosage could enhance the removal of RhB, while excess CoFe 2 O 4 dosage inhibited its degradation probably due to the clumping effect of magnetic nanoparticles . Five degradation products of RhB by CoFe 2 O 4 /PAA were identified and two degradation pathways of RhB were subsequently proposed, including bond cleavage and hydroxylation . CoFe 2 O 4 exhibited an excellent stability and reusability , and the removal rate of RhB could maintain at 92.4% after four cycles. Several kinds of organic contaminants were selected to evaluate the applicability of CoFe 2 O 4 /PAA system, and the results suggested that CoFe 2 O 4 /PAA system exhibited a selectivity for different contaminants.
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JOURNAL OF HAZARDOUS MATERIALS
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2022
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IF 14.224
Yongfei Tong,Peng Zhou,Yang Liu,Ningruo Wang,Wei Li,Feng Cheng,Bo Yang,Juan Liang,Yongli Zhang,Bo Lai
In order to accelerate the photo-Fenton reaction process of Fe(III) under visible light irradiation, BiOI was introduced into the Fe(III)/peroxydisulfate (PDS) system. The catalytic oxidation performance of vis-light/BiOI/Fe(III)/PDS system was evaluated using bisphenol AF (BPAF) as a representative organic contaminant . Within 30 min, nearly 100% of BPAF was degraded, proving that the system had an excellent ability to degrade organic pollutants in water. Free radical quenching experiments, electron spin resonance (ESR), and molecular probing experiments determined that the main reactive species in the system were hydroxyl radicals ( • OH) and sulfate radicals (SO 4 •− ). The comparative experiments showed that the degradation rates were closely related to the PDS consumption, while the Fe(II) absorbed on the surface of BiOI was responsible for the PDS consumption. The production pathway of Fe(II) was analyzed by XRD, FTIR and XPS characterization, the Fe(III) on the surface of BiOI was reduced by photogenerated electrons to generate Fe(II). The result confirmed that the reduction of Fe(III) by photogenerated electrons could effectively inhibit the recombination of electron-hole pairs, and accelerate the reduction progress of Fe(III)/Fe(II) cycle that was the rate-limiting step in PDS activation. Afterwards, a reliable mechanism for degradation of BPAF in visible light/BiOI/Fe(III)/PDS system was proposed. Finally, the influence of reactant dosages, visible light intensity , initial pH, humic acid (HA) and anions in the solution on the degradation of BPAF were discussed.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2021
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IF 8.528
Shuai Yang,Yang He,Jinsong Leng
Multi-stimuli selective actuation of shape memory polymers (SMPs) with multi memory capabilities have attracted great attention in recent years, due to diverse active deformation application scenarios. Current multi-SMPs with low T t , however, are faced with inherent barriers, such as low fixation and inaccurate control, because the shape retainability, controllability, and responsiveness of SMPs are highly determined by transition temperature (T t ). Herein, quadruple-shape memory poly(aryl ether ketone) (PAEK) with tunable high T t and selective response characteristics were successfully fabricated for the first time, which especially harnessed ultra-high programmability and controllability. More significantly, the quadruple shape memory PAEK-based smart architectures such as “fingers” and “flower” were demonstrated to exhibit the controllable multi-stages actions. Utilizing a “man” as an example, we put forward different programming routes up to ten to make it perform complex pre-set deformation actions. The quadruple shape memory PAEK of high T t possessed great utilizing potential in fields of soft robots , actuators, and deformable devices.
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