MACROMOLECULAR RESEARCH
·
2016
·Vol. 24
·期 11
·965-972
·
IF 1.357
Xie Min,Wang Jun,Wang Xu,Yin Mingying,Wang Ce,Chao Danming,Liu Xincai
In this work, electrospun poly(ether sulfone) (PES) nanofibrous membranes coated with hydrophilic polydopamine (PES-PDA) were successfully prepared. As a separator of lithium-ion batteries, the prepared PESPDA nanofibrous membrane shows ultrahigh porosity, due to the extra-large surface area of the nanofibers. Moreover, good thermostability of PES and polydopamine also results in the low shrinkage of the membrane under high temperature. As a result of the large number of amine groups and phenolic hydroxyl groups from the polydopamine, superior electrolyte wettability and high liquid electrolyte uptake capacity of the PES-PDA nanofibrous membrane have also been disclosed through comprehensive study, which would decrease the electrolyte absorption time and improve the performance of the battery. In the cell evaluation, an expected enhancement of cell performance with reduced polarization phenomenon and improved cycling stability is observed after coating with polydopamine, which certifies the validity of the polydopamine coating.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 32
·7737-7747
·
IF 5.317
Lei Miao,Yuanyuan Tu,Yang Yang,Shudong Lin,Jiwen Hu,Min Zhang,Yue Li,Fei Li,Yangmiao Mo
Graphical Doubly responsive : A thermo- and pH-sensitive binary graft copolymer bearing anchoring side chains was synthesized and blended with commercial polysulfone to prepare thermo- and pH-responsive blended membranes, which exhibited robust, reversible, independent temperature- and pH-responsive water wettability and water permeability (see figure). A stimuli-responsive membrane exhibiting independent pH- and temperature-responsive behavior was fabricated from a blend of commercial polysulfone with a functional amphiphilic binary graft copolymer, namely, polysulfone- graft -(poly(isopropylacrylamide- co -acrylic acid)- random -poly(methyl acrylate)), denoted PSf- g -(P(NIPAAm- co -AA)- r -PMMA). Two graft copolymers with different lengths of P(NIPAAm- co -AA) side chains were designed and enriched on the membrane surface to serve as thermo- and pH-responsive on/off switches. The differences between the dual-responsive behaviors of the two kinds of polymer-blend membranes were studied by water-flux and contact-angle measurements. The PMMA side chains served to securely anchor the graft copolymers to the membrane substrate, and the blended membrane prepared from binary graft copolymer was more stable and exhibited more robust stimuli-responsive behavior than that prepared from mono-graft copolymer PSf- g -P(NIPAAm- co -AA).
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2020
·
IF 4.3
John Michael Tesha,Derrick S. Dlamini,Saood Qaseem,Zhenyu Cui,Jianxin Li
Polysulfone–Styrene Maleic Anhydride (PSF/SMA) ultrafiltration (UF) membranes were prepared by the thermally induced phase separation (TIPS) method. The morphology of the UF membranes was fine tuned by varying the concentration of SMA. The surface of the membranes was then modified by dip-coating with β-cyclodextrin (β–CD) and Trimesoyl Chloride (TMC) to form tight UF membranes. The effects of β–CD on the separation performance, structure, and morphology of the flat sheet PSF/SMA membrane were examined. The tight UF membranes were characterized and then tested for the removal of Bovine Serum Albumin (BSA) and Congo red from water. The thickness was varied by increasing the concentration of β-CD. When increasing the concentration of β-CD from 2.0 % w/v to 8.0 % w/v, the thickness of the top layer increased from 8 μm to 18 μm, respectively. Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and X-Ray Photoelectron Spectroscopy (XPS) were used to confirm the successful deposition of the TMC and β-CD at the surface of the membrane. It was also established through Atomic Force Microscopy (AFM) that the roughness of membranes increases with an increase in β-CD concentration. The contact angle of the tight UF PSF/SMA blend membranes declined from 79.8° to 55.9° at the addition of β-CD implying that the hydrophilicity of the membranes improved. The lowest pure water flux of 40 Lm −2 h -1 was achieved by the membrane coated with 8.0 % w/v of β-CD. However, the highest pure water flux of 127 Lm −2 hr −1 was observed on the uncoated PSF/SMA UF membrane at 3 % wt/wt SMA. The highest BSA rejection (94 %) was recorded from PSF/SMA with a coating layer containing 8 % wt/v of β-CD concentration. Furthermore, the maximum Congo red dye rejection (96 %) was achieved by the tight UF membrane when β-CD concentration was 8 wt/v and the SMA was 3 % wt/wt.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 23
·48788
·
IF 2.188
Zhimei Wei,Fang Qiu,Xiaojun Wang,Shengru Long,Jie Yang
Conductive electrospun polymer fibers have attracted a great deal of interest in recent years. This study describes the preparation of electrically conductive microfibers composed of polyethersulfone/polydopamine/silver nanoparticles (PES/PDA/Ag NPs). Ag NPs acted as conductive centers, while hydroxyl- and amino-rich functional groups and excellent adhesion properties of PDA served to connect the Ag NPs and PES microfibers. Fourier transform infrared spectroscopy and scanning electron microscopy (SEM) showed that PDA was firmly adhered to PES microfibers. PES/PDA microfibers absorbed considerable amounts of silver ion from AgNO 3 solution, resulting in Ag NPs. X-ray diffraction, X-ray photoelectron spectroscopy, and SEM data represented the successful formation of PES/PDA/Ag NPs microfibers. Microfibers with optimal conductivity were obtained using a solution of 2% AgNO 3 at pH 9 at 50 °C for 45 min. The electrical resistivity of our PES/PDA/Ag NPs microfibers was only 202 Ω/cm, much lower than that of regular PES microfibers (2.1 × 10 9 Ω/cm). These results show that the PES/PDA/Ag NPs microfibers are suitable for use as conductive polymer fibers in electromagnetic shielding, and conductivity-sensing applications, and in flexible electronic devices and biosensors. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48788.
研究领域:
材料科学
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纳米技术
·
聚合物科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2022
·
IF 10.753
Kaizhen Wang,Shuhao Wang,Kaifeng Gu,Wentao Yan,Yong Zhou,Congjie Gao
Polyamic acid (PAA) is a flexible polymer and has abundant valuable hydrophilic groups. Herein, we developed an ultra-low pressure ultrafiltration (UF) membrane by integrating PAA into the polyethersulfone (PES) matrix via the “in-situ polycondensation” method. PAA was well compatible with PES and distributed uniformly in the membrane. The introduction of PAA improved membrane hydrophilicity. Meanwhile, the membrane pore structures were also refined. The membrane exhibited an excellent permeability under ultra-low pressure due to its improvement of hydrophilicity and pore structures. Under 0.3 bar, compare with the water flux of PES membrane, PES/PAA membrane improved nearly 2 times (571.05 L/(m 2 ·h)), with a high BSA rejection (≥90%). Even under a lower pressure, 0.1 bar, >300 L/(m 2 ·h) still can be achieved. Interestingly, the membrane we developed could maintain a high performance after drying, and then is very suitable for dry preservation. PES/PAA membrane showed a high oil removal (≥92%) and could remove oil from water effectively. Besides, the membrane exhibited excellent anti-oil-fouling properties. The flux recovery rate of PES/PAA (70.0%) far exceeds that of PES (37.9%) after three filtration and cleaning cycles. The membrane we developed is very valuable in oily wastewater treatment .
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Guangming Yan,Haoran Lu,Shushan Yuan,Xiao Deng,Junyong Zhu,Gang Zhang
In this study, a new category of copolymer was designed by side grafting of tertiary amines (TA) on polyaryl ether sulfone. The synthesized copolymers PES/ATA displayed superior thermal properties with a glass transition temperature of 200–225 °C. These copolymers with favorable film-forming properties were used to fabricate ultrafiltration membranes via a phase inversion approach. Surprisingly, it was found that the filtration performance of these resultant membranes could be reversibly tuned between a facile acid oxidation (CH 3 COOH:H 2 SO 4 :H 2 O 2 = 40:1:1) and alkali solution (solution of 20 wt% NaOH, immersed for 4–8 h) treatment. While the water flux of dye solution had a twofold reduction, the oxidized membranes showed distinctly enhancement of methylene blue rejection from 35% to 91.5% after oxidation treatment. Subsequently, alkali treatment of the oxidized membranes allowed their water flux to recover up to 89% as that of pristine membranes, and the methylene blue rejection can recover to almost the same as that of pristine membranes. This phenomenon was closely related to the introduced reactive TA units: the TA group in the polymeric membrane was converted into stimulus-responsive amine oxide (AO) unit, then its charge can be reversibly changed between the acid oxidation and alkali treatment, and that can be used to tune the electrostatic repulsion and further tuned the membrane pore size. In addition, compared with the polyarylene sulfone membrane, the mechanical properties of these membrane had almost no deterioration after several treatment cycle. This study supplies a novel and facile routine to fabricate functional membranes with reversible-tunable filtration properties.
研究领域:
材料科学
·
膜分离技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Bingling Yuan,Zhen Chen,Qianxuan Zhang,Guoxiong Zhan,Lei Xing,Zhoulan Huang,Yuchen Li,Lidong Wang,Junhua Li
Chemisorption with biphasic solvents is a promising low-energy strategy for separating CO 2 from industrial flue gas, however, amine degradation and changes in water content can considerably impede the phase-splitting performance. To the issues, tetramethylene sulfone (TMS) was selected as separating agent to prepare a biphasic solvent with polyamine triethylenetetramine (TETA) with a TETA:TMS:H 2 O ratio of 2:6:2 (denoted as 20 T-60TMS). The CO 2 loading of the blended phase and the volume fraction of the rich phase were 2.56 mol/L and 35.4%, respectively; the total regeneration heat duty was 2.36 GJ/tCO 2 . The proposed biphasic solvent exhibited better resistance to oxidative degradation and thermal degradation than did previously reported solvents, attributed to the beneficial effect of TMS. Additionally, the degradation products did not substantially reduce the phase separation performance after a 360 h thermal degradation test. A dynamic phase-splitting evaluation revealed that the 20 T-60TMS solvent was robust to changes in water content. Theoretical calculations confirmed that the introduction of TMS weakened the hydrogen bond between TETACOO − /TETAH + and H 2 O, engendering enhanced TETACOO − and TETAH + self-aggregation, forming a strong hydrogen bond network, and achieving fast phase separation. This work provides a novel biphasic solvent with excellent tolerance and stability for CO 2 capture from flue gas.
研究领域:
化学工程
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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 AGRICULTURAL AND FOOD CHEMISTRY
·
2022
·
IF 5.895
Shibin Deng,Yun Zhai,Heping Cui,Khizar Hayat,Xiaoming Zhang,Chi-Tang Ho
Methionine (Met) oxidation was observed during thermal degradation of methionine/glucose-derived Amadori rearrangement product (MG-ARP). The effects of oxidized methionine products, methionine sulfoxide (MetSO) and methionine sulfone (MetSO2), on pyrazine yields of the MG-ARP model were investigated. The pyrazine contents in the MG-ARP/Met and MG-ARP/MetSO models were found lower compared to those in the MG-ARP/MetSO2 model, and the inefficiency of pyrazine formation in the MG-ARP/Met model was proposed due to the fact that Met oxidation competitively inhibited the oxidation of dihydropyrazines for pyrazine formation in spite of relatively high methylglyoxal (MGO) content. The models of MGO mixed with Met, MetSO, or MetSO2 were established for further investigation of the mechanism for the involvement of Met oxidation in pyrazine formation. It was observed that the aldolization or carbonyl-amine reaction of MetSO with MGO was another important reason for the inhibition of pyrazine formation, except for the competitive inhibition of oxidative formation of MetSO on dihydropyrazine oxidation, and the adduct of MGO–MetSO was identified by MS/MS. These results also accounted for the phenomenon of low pyrazine yields but high yields of long-chain substituted pyrazines, which were converted from dihydropyrazines with the aldehyde involvement.
研究领域:
食品化学
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有机化学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2017
·
IF 6.035
Kai Zhu,Shuling Zhang,Jiashuang Luan,Yongfeng Mu,Yinlong Du,Guibin Wang
In this study, a novel polysulfone (PSf) with pendant tertiary amine groups was synthesized and this functionalized PSf could be further crosslinked based on a facile reaction between tertiary amine and 1,3-dibromopropane (DBP). The synthesis of this new polymer and the occurrence of the crosslinking reaction were evidenced by FTIR, 1 H NMR and solid state 13 C NMR spectroscopy. The crosslinked PSf and sulfonated poly(ether ether ketone) (SPEEK) were mixed together to fabricate ultrafiltration membranes by the phase inversion method. All the composite membranes exhibited improved hydrophilicity over the pristine PSf membrane, attributed to the presence of sulfonic acid groups and / or quaternary ammonium groups. The crosslinked membrane demonstrated superior permeability and antifouling properties than the uncrosslinked membrane due to the conversion of tertiary amine groups to more hydrophilic quaternary ammonium groups. In particular, the membrane with crosslinked PSf∶SPEEK ratio of 1∶1 showed the most favorable performance, including almost 3.5 times of pure water flux of the pristine PSf membrane and 97% of flux recovery ratio. Meanwhile, the crosslinked membrane maintained superior dimensional stability and mechanical properties compared to the uncrosslinked membrane, which is a major challenge faced by highly hydrophilic polymers , because of the restricted molecular chain movement caused by the crosslinking network and electrostatic interaction . All the resultant membranes were fully characterized, including surface properties, morphologies, mechanical strength , thermal stability, permeability, and antifouling properties.
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Peng Shi,Xingkang Hu,Ming Duan
The water-soluble pollutant including dye and heavy metal was a challenge to the water and environment. Adsorption was among one of the most promising technique for the recycle of dye but it usually required a long contact time. A membrane-like adsorbent was fabricated by mixing and depositing tannic acid, chitosan and metal organic framework (MOF, UIO-66) on polyethersulfone (PES) membrane in this study. The material was dense enough to conduct filtration like a membrane to remove both the anionic and cationic dye (acid brilliant scarlet and methylene blue), as well as Cr(VI) from water. When the ratio of MOF/Chitosan was 30% and the pH for mixing was 3.5, the pollutant removal reached 99% in the filtration for 200 min. The adsorbent in the dynamic filtration showed a pollutant loading capacity 3 times of the capacity in the static adsorption, which was caused by the enhanced driving force brought by the concentration polarization in the filtration. The particle size of the TA/CS/MOF mixture were characterized by dynamic light scattering as well as Zeta potential , FTIR, XRD , TEM and XPS . The morphology of membrane was observed by SEM. The result showed that the MOF played as core to disperse the tannic acid-chitosan mixture to improve the pollutant removal. TEM showed the TA/CS mixture formed an uniform coating outside the MOF particle at the pH of 3.5. The pseudo 1st order and pseudo 2nd order model fitted the adsorption kinetics well, while the Elovich model did not fit very well.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 30
·期 1
·221-229
·
IF 2.324
Hu Linqing,Zhong Jiachun,Tian Yuhan,Zheng Xiaoyi,Cheng Jie,Pu Zejun
Composite materials applied to capacitors with high dielectric constant, low dielectric loss and outstanding thermal stability are concerned widely in the field of dielectrics. So committed to the development of dielectric materials with excellent performance is the key factor. In this work, the barium titanate/polyether sulfone (BaTiO 3 /PES) composite films were prepared by a physical dispersion technology, which utilized a ball milling machine by high-speed circulation, scattered the PES solution contained BaTiO 3 in deionized water with the aid of a surfactant. Then, the BaTiO 3 /PES composite films were obtained through a series of operations, containing reclaimed organic solvent, washed with deionized water, filtered, dried and hot pressed. The morphology of the BaTiO 3 /PES emulsion was investigated by TEM and SEM. The results showed that the BaTiO 3 particles were covered in the PES resin matrix homogeneously. For 50 wt% BaTiO 3 reinforced PES composite film. The dielectric constant increased by ~ 227% compared with pure PES resin (4.1 at 1 kHz) and the dielectric loss maintained around 10 −2 magnitude, which performed better dielectric properties. The tensile strength of 10 wt% BaTiO 3 /PES composite films (72 MPa) reached the highest value in comparison with those of pure PES (58 MPa) due to the strengthened interaction between particles and matrix. Further increase of BaTiO 3 content, the tensile strength and elongation at break decreased slightly but remained an excellent flexibility from the PES matrix. The temperature at weight loss 5% ( T 5% ) of composite film with 40 wt% of BaTiO 3 content reached up to 503 °C in N 2 atmosphere. All the BaTiO 3 /PES composite films performed the concentrated glass transition temperature ( T g ) around 229 °C. In sum, excellent thermal stability and dielectric properties would make the BaTiO 3 /PES composite films become the fine potential candidates for dielectric composites in the capacitors.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2015
·Vol. 20
·期 9
·16709-16722
·
IF 2.416
Hai-Min Shen,Wen-Jie Zhou,Xin Ma,Hong-Ke Wu,Wu-Bin Yu,Ning Ai,Hong-Bing Ji,Hong-Xin Shi,Yuan-Bin She
A pH-dependence of the Brønsted acid-catalyzed oxidation of sulfides to the corresponding sulfoxides with H2O2is reported for the first time based on our systematic investigation of the catalytic performance of a series of Brønsted acids. For all of the Brønsted acids investigated, the catalytic performances do not depend on the catalyst loading (mol ratio of Brønsted acid to substrate), but rather depend on the pH value of the aqueous reaction solution. All of them can give more than 98% conversion and selectivity in their aqueous solution at pH 1.30, no matter how much the catalyst loading is and what the Brønsted acid is. This pH-dependence principle is a very novel perspective to understand the Brønsted-acid catalysis system compared with our common understanding of the subject.Keywords:sulfide;oxidation;sulfoxide;pH-dependence;Brønsted acid
研究领域:
化学
·
催化科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）