JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Shuanglong Xiao,Yang Zhang,Fan Zhang,Lulu Wang,Shaoji Wang,Jilin Wang
Poly(aryl piperidinium)-based anion exchange membranes (AEMs) have manifested remarkable chemical stability, thereby firmly positioning themselves as highly promising candidates for application in anion exchange membrane fuel cells (AEMFCs). However, the closely-packed polymer stacking configuration, along with the insufficient cation mobility, gives rise to inferior conductivity performance. In the present study, a novel cation substitution strategy was devised specifically for anion exchange membranes. This strategy entailed the utilization of quinuclidinium cations to substitute for piperidinium cations within aryl ether-free backbones, with the replacement process being facilitated by simple superacid catalysis. Molecular dynamics simulation revealed that, in contrast to the piperidinium cations which exhibited relatively stronger intermolecular interactions, the spherical quinuclidinium cations, characterized by their larger steric hindrance, were capable of augmenting the free volume within the AEMs. Consequently, this led to an enhancement in the mobility of cations. Through regulating the quinuclidinium substitution degrees, the cation substitution strategy can integrate the complementary advantages of the two cations to balance the cation interactions and mobility, hence optimizing the microphase separation morphology, and further controlling the properties of AEMs. Benefiting from the enhanced microphase separation architecture and elevated water uptake, the QPPTQP-50 % membrane exhibited a remarkably high conductivity of 174.9 mS cm -1 at 80 °C, while simultaneously maintaining a restricted swelling ratio of approximately 13 % at the same temperature. This outstanding performance effectively resolved the long-standing conductivity-swelling conundrum. Simultaneously, the QPPTQP-50 % manifested remarkable mechanical robustness, registering a tensile strength of 39.7 MPa and an elongation at break reaching up to 15.2 %. It also demonstrated outstanding alkaline resistance, as evidenced by a 95.9 % retention of OH − conductivity and a 94.7 % maintenance of tensile strength upon immersion in a 1 M NaOH solution at 80 °C for a period of 1680 h. Moreover, a single cell fabricated with the QPPTQP-50 % membrane was capable of attaining a peak power density (PPD) of 1.52 W cm −2 at 80 °C. In addition to this high power output, the cell exhibited excellent in-situ durability, signifying its long-term stability and reliability under operational conditions.
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
Environmental Technology & Innovation
·
2024
·
IF 6.7
Yongjia Lei,Hongyu Zeng,Ravi Naidu,Dong Tian,Li Zhao,Mei Huang,Jinsong He,Jianmei Zou,Shihuai Deng,Li Sun,Fei Shen
Due to the synergistic contribution, dual-frequency ultrasound can significantly enhance the degradation of organic contaminants, but the effects of different frequency combinations have not been clarified and need to be explored. In this study, several frequency combinations were designed firstly both in experimental exploration and numerical simulation within the dual-frequency ultrasound coupling persulfate (PS) system to investigate the effect of frequency combinations on the degradation of perfluorooctanoic acid (PFOA). The monitoring parameters included the defluorination percentage and the simulated maximum expansion ratio ( R max / R 0 ). The simulated maximum expansion ratios in different frequency combinations showed a high correlation with their defluorination results, indicating that the discrepancy in defluorination effects of different frequency combinations was mostly attributed to their various maximum expansion ratios. Additionally, various maximum expansion ratios could result in different maximum solution temperatures, and the increase in temperature was found positive for PFOA defluorination in this study. In addition, the synergistic parameters that affected the maximum expansion ratio were analyzed, including the phase difference, frequency ratio, and frequency value. The obtained results showed that the maximum expansion ratio varied with different phase differences, and the frequency ratio could affect the variation trend. For the same fundamental frequency, the larger the frequency ratio, the smaller the maximum expansion ratio. Under the same phase difference and frequency ratio, the larger the frequency value, the lower the cavitation.
研究领域:
环境科学
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化学工程
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产品关联
DOI
高影响因子
Nature Communications
·
2025
·Vol. 16
·期 1
·1-11
·
IF 15.7
Gao Haoyu,Huang Xianmei,Arockiyasamy Abilash Rosario,Zhou Xuan,Ding Xiaohong,Zheng Longhui,Liu Yilong,Ye Fuquan,Weng Zixiang,Wu Lixin
Vat photopolymerization 3D printed flexible polymer foams, characterized by their porosity and lightweight nature, are in high demand for applications in thermal insulation, sound absorption, noise reduction, and biomedicine. The vat photopolymerization used UV-curable resin composed of oligomer can provide excellent fabrication accuracy, however the high cross-linking density after curing prevents the green part from expanding and further being processed into foam parts. In this work, a facile additive manufacturing polyurethane foam preparation method that successfully balances fabrication accuracy and expansion ratio is presented. The oligomer containing difunctional dynamic polyurea bonds in the resin system ensures the printing accuracy. Additionally, the dynamic urea bonds disassociate under a heating condition, reducing the cross-linking density and providing free space for expansion. Moreover, heat stimulated chain extension and crosslinking enhance the stretchability of the foams, demonstrating a strain of up to 650% at a density of 0.25 g/cm 3 . This work addresses the challenge associated with fabricating free foaming parts via vat photopolymerization by delivering favourable surface quality and high expansion ratio without compromising mechanical properties.
研究领域:
材料科学
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化学工程
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2023
·
IF 2.3
Zhao Chengshou,Jiang Yisong,Fu Wang,Liu Zhuangyuan,Liu Siyuan,Peng Huaqiao,Esmaeili Nima
A novel epoxy-based self-intumescent fire protective coating has been developed by formulating a combination of ammonium polyphosphate (APP) and copper (I) oxide (Cu 2 O) in epoxy resin (EP). The effects of various combinations on fire protective performance for steel plate were evaluated using a lab-scale simulated big panel test. Formulations with different mass ratios of APP to Cu 2 O ranging from 10:0 to 2:8 exhibit good fire protective performance for steel plate. While the final equilibrium backside temperature of un-protected steel plate reached 529 °C, it did not exceed 282 °C for the protected plates with 2 mm thick coatings, which is much lower than the failure temperature of steel (ca. 500 °C). The lowest final equilibrium backside temperature of coated steel plate was 234.5 °C for the optimal formulation (EP/24APP/16Cu 2 O) with an APP/Cu 2 O mass ratio of 6/4 in EP. Interestingly, the limiting oxygen index (LOI) value (46.8%) for the optimized formulation (EP/24APP/16Cu 2 O) is not the highest, being lower than those of (EP/40APP/0Cu 2 O) and (EP/32APP/8Cu 2 O) formulations. The fire behavior of the optimized formulation (EP/24APP/16Cu 2 O) and control EP was compared using the cone calorimetry. The main fire hazard parameters such as peak heat release rate, total smoke production and peak CO production for EP/24APP/16Cu 2 O are reduced by 80.0%, 59.5% and 75.0%, respectively, relative to those for EP. This indicates that the EP/24APP/16Cu 2 O formulation provides significantly better fire safety than does control EP alone. A possible mode of action for the combination of APP/Cu 2 O in terms of the expansion ratio and heat insulation degree of the formed intumescent char layer may be proposed. Thus, this work contributed a reference for developing intumescent fire protective coating with high fire safety.
研究领域:
材料科学
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消防安全
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 48
·e53234
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IF 3.057
Mengqing Hua,Dong Chen,Zesheng Xu,Yiqun Fang,Yongming Song
Polylactic acid (PLA) foam is widely regarded as an effective substitute for petroleum-based foams. However, the fabrication of high-expansive, lightweight, highly hydrophobic foams for oil/water separation remains a challenge. Here, an innovative method was developed to improve the foaming ability of PLA by introducing silane modified alkaline lignin (m-LA), and a lightweight PLA foam with a high expansion ratio, high porosity, and high hydrophobic performance was successfully developed. The crystallization behavior, rheological properties, pore morphology, and oil/water separation performance of foams were evaluated. The results show that m-LA not only improves the crystalline properties of PLA, but also plays an important nucleation role during the foaming. m-LA increased the foaming ratio of PLA to 40.17 times, and reduced the apparent density of the foam to only 0.0303 g cm −3 . The PLA foam has exponent hydrophobicity. The water contact angle is up to 130.0°, and the adsorption capacity of various organic solvents is 5.17–12.44 g g −1 , because the surface energy of LA is reduced by silane modification. This study provides a new insight into the development of environment-friendly PLA foams for oil/water separation applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 41
·32416-32420
·
IF 3.84
Kang Qin,Kai Wang,Yang Li,Fanhe Kong,Tao Wang
The phase behavior of the 1-ethyl-3-methylimidazolium tetrafluoroborate ([emim][BF4]) and carbon dioxide (CO2) system from atmospheric to supercritical state was investigated at 0.1–15.0 MPa and 308.15–343.15 K. The solubility data of CO2 in [emim][BF4] and the volumetric expansion ratios of CO2-saturated [emim][BF4] were provided. Experimental results indicated that although CO2 dissolved significantly in [emim][BF4] (from 0 to 62 mol%), the ionic liquid phase only had an expansion ratio less than 17 vol%. The density difference between CO2-saturated [emim][BF4] and pure [emim][BF4] was obvious at high pressure and low temperature, with a maximum of 16.11% at 308.15 K and 15.0 MPa. Based on the experimental results, a fitting equation applicable to precise data interpolation was proposed for the CO2-saturated [emim][BF4] density in this study.
研究领域:
化学工程
·
物理化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 8
·1-13
·
IF 3.097
Cheng Xiao-Han,Wang Ke,Cheng Nian-Qi,Mi Si-Yu,Sun Liang-Shuang,Yeh Jen-Taut
The expansion ratio, resilience rate, moisture-proof, complex dynamic viscosity and crystallization rate for scCO 2 -aid glutaraldehyde modified thermoplastic starch (SC a TSGA 1.6 ) foams were substantially improved by further modification with sodium hexametaphosphate (SHP) and/or nano-silica (nano-SiO 2 ) particles during their scCO 2 -assisted foaming processes. These properties of SHP modified SC a TSGA 1.6 (SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c ) foams were further improved with increasing scCO 2 -pressures during their scCO 2 -assisted foaming processes. Extremely high expansion ratio of ~ 65 and high resilience rate of 77% of the most appropriate SC 11 TSGA 1.6 SHP 4 SiO 2 0.5 foam were originally prepared using scCO 2 -assisted foaming processes. The significantly enhanced reliance rate found for SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c foams is attributed to the better resilience of the smaller cell structures. Moreover, reaction of phosphate groups of SHP with the moisture-sensitive O–H groups of starch did occur favorably, and substantially improved the moisture-proof and complex dynamic viscosity (or melt strength) during the scCO 2 -assisted modification processing of SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c . Thermal analyses revealed that crystallization rates and crystallization onset temperatures for SC 11 TSGA 1.6 SHP 4 SiO 2 c were substantially improved by addition of nano-SiO 2 particles. This substantial increase in melt strength, higher dissolved CO 2 concentrations at larger scCO 2 -pressures and/or higher crystallization rates for SC a TSGA 1.6 SHP b and/or SC 11 TSGA 1.6 SHP 4 SiO 2 c are expected to considerably enhance their nucleation rate and stability of cell structures during their scCO 2 -aid foaming processes. Consequently, higher expansion ratio, cell density and better reliance rate was found after the scCO 2 -aid foaming processes of SC a TSGA 1.6 SHP b and SC 11 TSGA 1.6 SHP 4 SiO 2 c foams.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ENERGY & FUELS
·
2021
·
IF 3.605
Zongyang Li,Yefei Wang,Hong He,Fuqing Yuan,Haocheng Liu,Yuqiu Chen
The branched-preformed particle gel (B-PPG) is a novel viscoelastic particle gel used for improving sweep efficiency and enhancing oil recovery in a heterogeneous mature reservoir. To improve the performance of B-PPG, partially hydrolyzed polyacrylamide (HPAM) is used to increase the viscosity and to prepare a homogeneous B-PPG suspension. Although some encouraging progress has been made in the application of polymer-enhanced B-PPG suspension, its transport behavior in porous media is still unclear, which is crucial for its application in enhanced oil recovery (EOR) in a heterogeneous reservoir. Due to the complex reservoir condition of different brine salinities, the physiochemical property of polymer-enhanced B-PPG suspension as well as its transport behavior in porous media can be affected, which may lead to unsatisfactory results. Understanding the effects of salinity on the transport behavior of polymer-enhanced B-PPG suspension in porous media is of vital importance in figuring out the flow behavior and improving the sweep efficiency in the mature reservoir. In this study, the effects of salinity on the swelling ratio, particle size, viscosity property, and suspension stability of B-PPG and polymer-enhanced B-PPG suspension were studied. Meanwhile, sand pack flow experiments were conducted to study the transport behavior of polymer-enhanced B-PPG suspension in porous media. The results show that when the brine salinity increases, the swelling ratio and particle size of B-PPG, as well as the viscosity and the suspension stability of polymer-enhanced B-PPG suspension all demonstrate a decreasing trend. In the range of 3550–10 651 mg·L–1, as the brine salinity increases, the resistance factor decreases and the transportation of polymer-enhanced B-PPG suspension in porous media becomes easier. In this case, the ratio of swollen B-PPG particle diameter to the pore throat diameter turns out to be the determining factor that governs the transport behavior. However, when the brine salinity is higher than 10 651 mg·L–1, with the increase of brine salinity, the resistance factor increases. As a result, the effects of viscosity and suspension stability of polymer-enhanced B-PPG suspension become more prominent.
研究领域:
石油工程
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化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
SOLID STATE IONICS
·
2019
·
IF 2.886
Lesi Yu,Baohua Yue,Liuming Yan,Hongbin Zhao,Jiujun Zhang
Polysulfone- g -(phosphonated polystyrene) (PPSF) is synthesized by grafting of poly(phosphonated polystyrene) to polysulfone (PSF) backbone via controlled atom-transfer radical polymerization (ATRP). And its comprehensive performances are improved by compositing with sulfonated polysulfone (SPSF). The best comprehensive performances are achieved in the composite membrane consisting of 80 wt% PPSF and 20 wt% SPSF (P80S20). The maximum proton conductivity reaches 17.23 mS cm −1 at 95 °C and 90% RH, which is 3.3 times as high as the pristine PPSF at 5.22 mS cm −1 . In addition, the composite membrane exhibits favorable thermal stability, compromised water uptake and swelling ratio, significantly improved mechanical strength . Moreover, the methanol permeability is reduced from 5.74 × 10 −8 cm 2 s −1 for PPSF to 0.96 × 10 −8 cm 2 s −1 for P80S20.
研究领域:
材料科学
·
高分子化学
·
燃料电池技术
✓ 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）