CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Mingji Su,Yong Liu,Shihong Li,Zhengping Fang,Benqiao He,Yuhong Zhang,Yulin Li,Peixin He
Hydrogel has been widely applied in agriculture, oil/water separation, and tissue engineering due to its hydrophily and three-dimensional network structure. But its practical applications are restricted by their non-reversible deformation or poor mechanical property to a great extent. In this study, we prepared a rubber-like, interpenetrating-network poly(acrylamide-co-acrylic acid)/chitosan/methacryloxy propyl trimethoxyl silane modified SiO 2 nanocomposite hydrogel (P(AM-co-AA)/CS/MPS-SiO 2 nanocomposite hydrogel, SIPN-Gels) that exhibit feature underwater superoleophobicity, self-healing and low swelling ratio properties. The nanocomposite hydrogel has hierarchically porous structure and dense spherical papillae structures on its surface, which can improve oil-repellent capability and result in superoleophobicity and self-cleaning property. Besides, synergetic interactions of CS physical networks and MPS-SiO 2 crosslinked P(AM-co-AA) covalent network endows the hydrogel with rubber-like mechanical property (high elasticity, fast self-recovery after large tensile or compression deformation), superior to most of reported underwater superoleophobic hydrogels. To apply this hydrogel for efficient oil/water separation, the obtained underwater superoleophobic hydrogel is further coated on a stainless-steel mesh as separator, we believe that the rubber-like nanocomposite hydrogel will inspire researchers to design flexible and wearable oil-repellent or oil/water separation materials.
研究领域:
材料科学
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环境工程
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2012
·
IF 3.85
Qiang Zhang,Baijun Liu,Wei Hu,Wan Xu,Zhenhua Jiang,Wei Xing,Michael D. Guiver
Two series of novel side-chain-acid poly(arylene ether)s bearing aliphatic-chain-linked sulfophenyl pendants are synthesized by direct polycondensation reactions derived from a new sulfonated difluoro-monomer, sodium 4-(3-(4-(2,6-difluorobenzoyl)phenoxy)propoxy)benzenesulfonate. The sulfonation content is readily controlled by adjusting the feed ratios of sulfonated and unsulfonated monomers. The obtained polymers exhibit considerably reduced dimensional swelling and good proton conductivities. It is found that the cyano-functionalized poly(arylene ether)s exhibit lower water uptake and dimensional swelling in comparison with the corresponding SPAE series. SPAEK-3 with an ion exchange capacity of 1.5 mequiv g −1 has proton conductivity of 0.12 S cm −1 and water swelling ratio of only 26% at 100 °C. Importantly, obvious hydrophobic/hydrophilic phase separation morphology is observed, which may be highly related with their good proton transport ability.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2019
·
IF 3.621
Wei Liu,Lulu Wang,Jilin Wang,Ruijiang Feng
A comb-shaped anion exchange membrane was successfully constructed by simultaneously introducing a hydrophobic aliphatic long-chain bromododecane (BA) and a hydrophilic short-chain bromoethanol (BE) as a quaternizing agent into the side chain of poly-4-vinyl-pyridine (P 4 VP). The aforementioned membrane chemical structure was investigated by FT-IR, and confirmed that the BA and BE were successfully grafted onto the P 4 VP backbone. A series of performance test results reveal that the water uptake (WU) and swelling ratio (SR) are effectively controlled with the BA content increased from 0% to 75.0%, which the value was corresponding to the water uptake decreases from 92.3% to 31.8%, and the swelling ratio decreases from 78.4% to 7.8%. Interestingly, the conductivity of synthesized membrane in this paper is much increased with substantially the same ion exchange capacity (IEC) (from 50.0 mS·cm −1 for BE 100.0% -BA 0% /P 4 VP to 75.0 mS·cm −1 for BE 25.0% - BA 75.0% /P 4 VP at 70 °C), which can be attributed to the microphase-separated structure. On the other hand, the membrane BE 25.0% -BA 75.0% /P 4 VP has the best overall performance, which with the conductivity of 75.0 mS·cm −1 at 70 °C, which the temperature closest to the alkaline fuel cell operating temperature. And it also had excellent tensile strength (16.0 MPa) and elongation at break (5.9%), indicating sufficient flexibility and processability, and it has excellent chemical stability immersed it into 3 mol·L −1 KOH for up to 240 h, which was the conductivity can still reach more than 70% of the initial value. And the aforementioned membrane also with the better thermal stability (the thermal decomposition temperatures above 200 °C). The single cell test result reveal that the membrane displayed good cell performance with a power density of 47.52 mW·cm −2 at 70 °C. In summary, the comprehensive performance of BE 25.0% -BA 75.0% /P 4 VP is expected to be applied to alkaline polymer fuel cells.
研究领域:
材料科学
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燃料电池
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高分子化学
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产品关联
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2018
·
IF 2.873
RiMing Chen,FuZhong Xu,Kang Fu,JingJing Zhou,Quan Shi,Chang Xue,YingChun Lyu,BingKun Guo,Guang Li
A series composited membranes of sulfonated poly(arylene ether sulfone) and graphene oxide (SPAES-GO-x) have been exploited as proton exchange membrane. The properties of SPAES-GO-x membranes were evaluated including proton conductivity, water uptake, swelling ratio, oxide and thermal stability. Incorporating GO into SPAES matrix restrained the composite membranes swelling and enhanced their proton conductivity. The SPAES-GO-3% membrane showed a conductivity value of 0.183 S cm −1 at 120 °C and relative humidity 100%. Compared with the pristine SPAES membrane, the swelling ratio of SPAES-GO-2% membrane was reduced by 55.7% at 90 °C. Small-Angle X-ray Scattering (SAXS) revealed GO promoted SPAES molecular chain movement to form bigger ionic clusters in favor of enhancing proton transport. X-Ray Diffraction and Field Emission Scanning Electron Microscope (XRD and FE-SEM) analysis further demonstrated GO was exfoliated and distributed throughout the SPAES matrix. These results indicated GO was an effective filler to trade off proton conductivity and swelling of composite membrane.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2019
·
IF 7.015
Chenxiao Lin,Jixia Wang,Guohong Shen,Junfei Duan,Dong Xie,Faliang Cheng,Yan Zhang,Shiguo Zhang
In order to develop anion exchange membranes (AEMs) with high ionic conductivity , low swelling ratio (SR) and long-term alkaline stability, a series of crosslinked polybenzimidazole-based AEMs (FPBI-QPVC x ) were prepared. We herein demonstrated that the integration of a partially fluorinated polybenzimidazole and quaternized poly(vinylbenzyl chloride) benefits the fabrication of the AEMs with well-defined hydrophilic/hydrophobic phase-segregated structure, leading to a relative high hydroxide conductivity of 91.7 mS cm −1 at 80 °C for FPBI-QPVC 2.5 . The existence of a crosslinking structure endowed the as-prepared AEMs with relatively low water uptake and SR. Besides, the FPBI-QPVC x AEMs also have robust mechanical properties , high thermal decomposition temperature and good alkaline stability. Only 10.7% of conductivity loss was observed after soaking the ether-bond-free AEMs into 1 M a.q. KOH at 80 °C for 480 h. A maximum power density of 197.5 mW cm −2 was determined by a single cell using FPBI-QPVC 2.5 AEM.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2023
·
IF 7.2
Ao Nan Lai,Pei Zhi Zheng,Shu Chun Li,Yi Fei Zhu,Peng Cheng Hu,Shu Feng Zhou
A new approach is presented here for constructing higher-performance anion exchange membranes (AEMs) by combining block-type and comb-shaped architectures. A series of quaternization fluorene-containing block poly (arylene ether nitrile ketone)s (QFPENK-m-n) were synthesized by varying the length of hydrophobic segment as AEMs. The well-designed architecture, which involved grafting comb-shaped C10 long alkyl side chains onto the block-type main chains, formed efficient ion-transport channels, as confirmed by atomic force microscopy . As a result, the AEMs showed high hydroxide conductivities in the range of 34.3–102.1 mS⋅cm −1 from 30 to 80 °C at moderate ion exchange capacities (IECs). Moreover, the hydrophobic segment with nitrile groups also exhibited a profound anti-swelling property for the AEMs, resulting in ultralow swelling ratios ranging from 4.7% to 7.1% at 30 °C and 7.5%–9.8% at 80 °C, as well as superb conductivity-to-swelling ratios at 80 °C. In addition, the AEMs displayed good mechanical properties , thermal and oxidative stability , and optimizable alkaline stability.
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
ENERGY & FUELS
·
2025
·
IF 5.3
Jing Guo,Rui Liu,Chunhui Shen,Shanjun Gao
The N-spirocyclic ammonium with exceptional alkaline stability is employed to fabricate anion exchange membranes (AEMs) suitable for long-lasting fuel cell applications. In this paper, two types of N-spirocyclic ammonium, namely 3-(2-(piperidine-4-yl)ethyl)-6-azaspiro[5.5]undecan-6-ium (ASU) and 3,6-diazaspiro[5.5]undecan-6-ium (DSU), are incorporated into an acrylonitrile-styrene copolymer (SAN) to enhance the alkaline stability of AEMs. The introduction of N-spirocyclic ammonium results in AEMs exhibiting excellent alkaline tolerance, particularly the SAN resin membranes incorporating the ASU group (SAN-ASU-OH), which retain 95.0% of their initial conductivity after undergoing a 720-h alkaline treatment at 80 °C, and 1H NMR shows that almost no β-elimination occurred in the SAN-ASU-OH membranes. The utilization of SAN resin as the primary structural component provides a reasonable tensile strength (8.51 MPa) for SAN-ASU-OH, enhances the ion conductivity of AEMs significantly, and ensures a certain water uptake (WU) at the same time to ensure a low swelling ratio (SR). For instance, hydroxide conductivity of the membranes reached 67.7 mS cm–1 at 80 °C for the SAN-ASU-OH membrane while WU reached 81.65% and SR was limited to only 18.42% at 80 °C. The results indicate that the membranes based on SAN resins incorporating N-spirocyclic ammonium are expected to be promising candidates for future fuel cell applications.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 5
·535-543
·
IF 2.352
Yang Hu,Lihui Wang,Jie Shen,Guoqiang Jiang,Chengyou Kan
Using styrene (St) and N , N ′-dimethylaminoethyl methacrylate (DMAEMA) as raw materials, monodispersed P(St- co -DMAEMA) nanoparticles (NPs) were first prepared via semi-continuous emulsion polymerization, and using a stepwise acid–alkali post-treatment, porous P(St- co -DMAEMA) NPs were then obtained and used to adsorb heavy metal ions in aqueous phase. Results showed that the post-treatment conditions including temperature, initial pH and time of acid–alkali treatment had significant effects on the morphology of the porous P(St- co -DMAEMA) NPs, with higher temperature, more extreme pH condition and longer treatment time resulting in larger pores and volume swelling ratio. Under the optimized acid–alkali post-treatment conditions (60 °C, acid treatment at pH = 4.0 for 1 h and then alkali treatment at pH = 10.0 for 1 h), the obtained porous NPs had nearly 15 times the surface area and 1.5 times the amount of surface amino groups than the corresponding solid NPs. An analysis of the mechanism of metal ion adsorption on the porous NPs indicated that the adsorbed amount of metal ions was the result of synergistic effect of physical and chemical adsorption, which was closely related to the porous NP surface area, amount of surface of amino groups and the volume of the ions. © 2018 Society of Chemical Industry
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
·
IF 4.784
Linjun Wu,Siqi Huang,Jia Zheng,Zhongjie Qiu,Xuliang Lin,Yanlin Qin
The traditional polyvinyl alcohol composite hydrogel exhibited poor swelling and mechanical properties, which limited its application. To solve these issues, we use biomass lignin as raw material, PVA as matrix template and epichlorohydrin as cross-linker to prepare the Lignin-PVA super-absorbent hydrogels with the swelling ratio of up to 456 g/g under mild condition. When the lignin concentration was increased from vacancy to 5%, the swelling ratio of the Lignin-PVA hydrogels was increased from 92 g/g to 456 g/g. The lignin-based hydrogel synthesized by the higher molecular weight PVA showed better swelling performance. Softwood lignin, hardwood lignin and corncob lignin could also be used to fabricate the Lignin-PVA super-absorbent hydrogels with the swelling ratio of higher than 500 g/g. However, the optimum amount varied from different lignin types, which was related to the molecular weight and phenolic hydroxyl content of lignin. The structural mechanism of the Lignin-PVA hydrogel was proposed to clearly certify the enhancing role of lignin. The adsorption capacity of the Lignin-PVA hydrogel with respect to rhodamine 6G, crystal violet and methylene blue dyes was up to 196, 169 and 179 mg/g, respectively. The Lignin-PVA hydrogel presents great potential applications in the fields of soil water retention and seed cultivation in agriculture, and dye pollutant removal.
研究领域:
高分子材料
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环境科学
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农业工程
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功能材料
·
污染治理
✓ 已验证
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Zhaosheng Hou,Jinwei Teng,Jinjian Wei,Tiantian Hao,Zhengqi Liu
The objective of this study is to offer a highly pH-sensitive biodegradable polyurethane for application as an intelligent drug delivery carrier. A new pyridinyl diol ((3-((2-(pyridin-4-yl)ethyl)thio) propane-1,2-diol, PyDH) was first synthesized via thiol-ene “click” reaction. Then, PyDH-based poly(ether-ester-urethane) (PEEU-Py) was designed and prepared through the condensation polymerization of PyDH diol, poly(ether-ester) diol and diisocyanate. The pendent pyridine groups and the polyester segments could endow the polymers with pH sensitivity and degradability, respectively. The bulk structures and physicochemical properties of PEEU-Py were characterized via 1 H NMR, FT-IR, GPC, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and tensile testing. The cast membranes exhibited a sharp transition of the equilibrium swelling ratio (ESR) at pH 8.5∼9.0, and ESR increases of more than twofold and eightfold at pH 1.5 relative to pH 7.4 and pH 12.0, respectively. In vitro drug release studies showed that the release efficiency from the membranes was increased with decreasing pH value. The pH-sensitive release behaviors were related mainly to the swelling ability, and the slow hydrolytic degradation rate of PEEU-Py membranes had minimal influence on it. In addition, the in vitro cytotoxicity was evaluated by an MTT assay with L929 fibroblasts, and a cell viability of more than 75 % indicated satisfactory cytocompatibility. All the results demonstrate the potential application of PEEU-Py as a biological on–off switch for drug carriers that is triggered by an external pH change.
研究领域:
材料科学
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高分子化学
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药学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Dafu Cao,Fei Yang,Weibing Sheng,Yufeng Zhou,Xixing Zhou,Yaguang Lu,Fengmin Nie,Nanwen Li,Li Pan,Yuesheng Li
To restrain excessive water uptake (WU) and swelling ratio (SR) of the quaternized polynorbornene anion exchange membrane (AEM) without sacrificing its anion conductivity, hydrophobic arylene substituent was introduced into polymer chain. The resultant cyclic olefin polymers (PBH-x-QA series) exhibited high glass-transition temperature ( T g ) and tensile strength to meet the most important requirements of use as AEMs. Besides, the PBH-x-QA with ion exchange capacity (IEC) value ranged from 1.26 to 2.08 meq/g showed appropriate water uptake, good dimensional stability, and excellent tensile properties . The PBH-50%-QA exhibited water uptake of 31.0 wt% and swelling ratio (SR) of 17.6%. These values were much lower than those of PBN-26%-QA (WU = 95.5%, SR = 33.8%), which exhibited similar IEC value but had no arylene substituent. Notably, the PBH-60%-QA showed excellent hydroxide conductivity up to 101.9 mS/cm at 80 °C without excessive swelling in water, while PBH-50%-QA membrane showed excellent alkaline stability without visible loss of hydroxide conductivity, even after being immersed in 1 M NaOH aqueous solution over the 16-day test at 80 °C. A platinum-catalyzed H 2 /O 2 fuel cell with PBH-50%-QA AEM presented a peak power density up to 228 mW cm −2 without optimized membrane electrode assembly fabrication process.
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
HIGH PERFORMANCE POLYMERS
·
2013
·
IF 0.85
Xiaobai Li,Yang Song,Zhuang Liu,Pengju Feng,Siyuan Liu,Yunwu Yu,Zhenhua Jiang,Baijun Liu
A series of triple-layer membranes were prepared based on a sulfonated polyimide (SPI) and a traditional sulfonated poly(ether ether ketone) (SPEEK) polymer matrix. Compared with the single-component membranes (pure SPI and SPEEK), the multicomponent membranes exhibited better comprehensive performance. Interestingly, the triple-layer membranes possessed improved mechanical properties, lower water uptake, and swelling ratio than those of the corresponding blend membranes. When the contents of SPI were 30 and 40%, the triple-layer membranes even had lower methanol permeability (3.42 and 2.61 × 10−7 cm2 s−1, respectively) than that of the pure SPI membrane (3.51 × 10−7 cm2 s−1). The proton conductivity of the triple-layer membranes was in the range of 0.117–0.149 S cm−1 at 100°C. All the results suggest that the triple-layer membranes have sufficiently excellent performance to be applied in fuel cells.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）