ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Nannan Zhang,Xiao Chen,Shiyao Liu,Jipeng Meng,Marc Armbrüster,Changhai Liang
High-entropy alloys (HEAs), as new heterogeneous catalytic materials, possess remarkable catalytic performance in numerous reactions. However, rational and controllable synthesis of these complex structures remains a challenge. In this work, bulk and carbon nanotube (CNT)-supported ultrasmall PtFeCoNiCu HEA nanoparticles with an average particle size of 1.58 nm are prepared by lithium naphthalenide-driven reduction under mild conditions. The supported PtFeCoNiCu/CNT catalyst exhibits high catalytic activity in the aqueous-phase hydrogenation of maleic anhydride to succinic acid with a selectivity of 98% at full conversion of maleic acid (the hydrolysis product of maleic anhydride), a low apparent activation energy (Ea = 49 kJ mol–1), and excellent stability. Moreover, a much higher mass-specific activity of Pt in the catalyst is displayed over PtFeCoNiCu/CNT (1515.4 mmolmaleic acid gPt–1 h–1) than that of 5 wt % Pt/CNT (388.0 mmolmaleic acid gPt–1 h–1). This work provides a strong support for HEAs as advanced heterogeneous catalysts and will be of great significance for promoting the research and application of HEAs in the field of selective hydrogenation.
研究领域:
材料科学
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催化化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
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2015
·Vol. 23
·期 3
·341-347
·
IF 1.671
Qian Shaoping,Mao Hailiang,Zarei Elmira,Sheng Kuichuan
To improve the interfacial interaction between poly(lactic acid) (PLA) and bamboo particles (BP), sodium hydroxide solution was employed to pretreat BP, and then maleic anhydride (MAH) was used to compatibilize PLA/BP biocomposites. The biocomposites were prepared through melt blending and hot-pressing. Effects of MAH concentration on the properties of BP and PLA/BP biocomposites were investigated using Fourier transform infrared spectroscopy, mechanical measurements, differential scanning calorimetric, melt flow rate (MFR) analysis and scanning electron microscope. Results showed that interfacial interaction between PLA and BP in the biocomposites was improved with MAH compatibilizer. Tensile strength and elongation at break of PLA/BP biocomposites, reached maximal values of 47.6 MPa and 6.22 %, respectively, when treated with 1.0 % MAH. Maximal flexural strength of 72.61 MPa and flexural modulus of 4.65 GPa were obtained with 0.5 % MAH treatment, and thermal properties were also improved at this concentration. MFR of the blends was enhanced with MAH compatibilization.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2025
·
IF 2.3
Zhou Huibin,Wang Hairui,Zhang Hongyu,Chen Liheng,Han Qingzhen,Zong Chengzhong
Polyurethanes are widely used in many fields, and with the expansion of market demand, the improvement of their comprehensive performance through modification techniques has become a research priority. In this paper, modified polyurethane (MPU) was synthesized by reacting terminal hydroxyl polyurethane prepolymer (Pre-PU) with maleic anhydride (MA), and the effects of the introduction of MA as well as the different additions on the properties of MPU were investigated. The structure of MPU was determined using Fourier transform infrared spectroscopy, and the water contact angle and water absorption tests showed that the hydrophilicity of MPU was significantly enhanced, and from the solvent resistance test, it was known that MPU was easy to decompose in acetone, and from the results of the differential scanning calorimeter and the heat loss analyzer, it was known that modified polyurethanes were tunable in terms of their thermal properties by adjusting the amount of MA added. The results of the study offer the possibility of expanding the application areas of polyurethane and its application in special environments.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2020
·Vol. 43
·期 8
·1474-1478
·
IF 2.878
Xuefang Liu,Chen Yang,Feifang Zhang,Huiliang Geng,Bingcheng Yang
A novel weak cation exchanger is described by encapsulating silica with a (or multiple) layer(s) of maleic anhydride–modified polyvinyl alcohol coating(s). The preparation method is facile and fast, which is simply performed by dipping silica particles into maleic anhydride–modified polyvinyl alcohol solution as-synthesized, then filtering and curing thermally, and finally generating a thin coating onto silica particles. Multiple layers of maleic anhydride–modified polyvinyl alcohol coatings can be generated by repeating above steps, offering an easy way to manipulate the capacity. The obtained weak cation exchanger demonstrated high separation efficiency and good selectivity toward common inorganic cations, for example, high plate count of 81 000 per meter was obtained for NH 4 + . Simultaneous separation of alkali and alkaline earth metals could be achieved within 14 min under isocratic conditions.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
SEPARATION SCIENCE AND TECHNOLOGY
·
2015
·
IF 1.171
XiaoMei Zhang,HongZhan Li,ManLi Cao,Liang Shi,ChaoYue Chen
A new [#x003B2]-cyclodextrin functionalized poly (styrene-alt-maleic anhydride) was synthesized for removal of basic fuchsin (BF) and methylene blue (MB) from water via grafting reaction of [#x003B2]-cyclodextrin onto poly (styrene-alt-maleic anhydride) and then acylation with chloroacetyl chloride. Its structure was characterized. At a dosage of 0.25 g[#x000B7]L[#x02212]1, pH 6, and 25[#x000B0]C, adsorption equilibrium was reached in 600 min and maximum adsorption quantities to BF and MB were 295 mg[#x000B7]g[#x02212]1 and 528 mg[#x000B7]g[#x02212]1, respectively. The equilibrium data fitted the Langmuir isotherm and the adsorption kinetics data followed the pseudo-second-order model. Adsorption processes were endothermic, entropy gained, and spontaneous in nature within 288-308 K.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2015
·
IF 6.723
Juncheng Ma,Xueqin Wang,Qiuxia Fu,Yang Si,Jianyong Yu,Bin Ding
Construction of adsorptive materials for simple, efficient, and high-throughput adsorption of proteins is critical to meet the great demands of highly purified proteins in biotechnological and biopharmaceutical industry; however, it has proven extremely challenging. Here, we report a cost-effective strategy to create carbonyl groups surface-functionalized nanofibrous membranes under mild conditions for positively charged protein adsorption. Our approach allows maleic anhydride to in situ graft on cellulose nanofibrous membranes (CMA) to construct adsorptive membranes with large surface area and tortuous porous structure. Thereby, the resultant CMA membranes exhibited high adsorption capacity of 160 mg g–1, fast equilibrium within 12 h, and good reversibility to lysozyme. Moreover, the dynamic adsorption was performed under low pressure-drops (750 Pa), with a relatively high saturation adsorption amount of 118 mg g–1, which matched well with the requirements for proteins purification. Considering the excellent adsorption performance of the as-prepared adsorptive membranes, this simple and intriguing approach may pave a way for the design and development of robust and cost-effective adsorption membranes to meet the great demands for fast and efficient adsorption of positively charged proteins.
研究领域:
材料科学
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生物技术
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化学工程
·
药学
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产品关联
DOI
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2014
·
IF 2.241
Xiang Liu,Yonghong Hu,Mengmeng Liang,Yonglan Li,Jingjing Yin,Wenge Yang
Data on corresponding solid–liquid equilibrium of maleic anhydride in different organic solvents are essential for industrial design and further theoretical studies. In this study, the solubilities of maleic anhydride were measured in DMF, methanol, acetic acid, acetonitrile , acetone, ethyl acetate , 2-propanol and n-butyl alcohol with the temperature range of 278.15–323.15 K by the analytical stirred-flask method under atmospheric pressure. The experiment results indicated that the solubility of maleic anhydride was highest in DMF and followed by methanol, acetic acid, acetonitrile, acetone, ethyl acetate, 2-propanol and n-butyl alcohol. For the temperature range investigated, the solubilities of maleic anhydride in the organic solvents increased with increasing temperature. Results of these measurements were well-correlated with the modified Apelblat equation, the Buchowski–Ksiazaczak λh equation and the van’t Hoff equation. The calculated solubilities showed good agreement with the experimental data. The modified Apelblat equation was found to regress the solubility data is higher accuracy than the Buchowski–Ksiazaczak λh equation. The experimental data and model parameters would be useful for optimizing the process of purification of maleic anhydride in industry.
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 APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 22
·52234
·
IF 3.057
Changkai Linghu,Lijin Xie,Le Yang,Xiaolong Li,Yao Tao,Yinhan Xu,Zhu Luo
Grafted maleic anhydrides (MAHs) are common compatibilizers, and the Epoxy (EP) group exhibits high activity of epoxy functional groups and strong affinity with both acidic and basic groups. Therefore, high efficiency and broad-spectrum compatibilizers can be obtained by grafting these two monomers onto the polymer molecular chain. In this study, the grafted MAH was used as the graft platform to add the second graft monomer, and the bisphenol A epoxy resin (E51) with two epoxy functional groups or the tri-epoxy functional triglycidyl isocyanurate (TGIC), was added into the polylactic acid molecular chain, in order to prepare the double-monomer grafted PLA compatibilizers. Three kinds of compatibilizers, polylactic acid grafted maleic anhydride (PLA-g-MAH), polylactic acid double grafted maleic anhydride/bisphenol A epoxy resin (PLA-g-MAH-E51), and polylactic acid double grafted maleic anhydride/triglycidyl isocyanurate (PLA-g-MAH-TGIC) were successfully prepared using this single-step method. Finally, FTIR and 1 H-NMR were adopted to measure the grafting degrees and structures of the grafted products. The grafting degree of PLA-g-MAH20% was 5.36%, the MAH and EP grafting degrees of PLA-g-MAH 20%-E51 6% were 2.47% and 1.15%, respectively, and the MAH and EP grafting degrees of PLA-g-MAH 20%-TGIC6% were 2.30% and 0.93%, respectively. A portion of that EP was grafted onto the PLA molecular chain by reacting with grafted anhydride, resulting in a decrease in the number of grafted anhydride groups.
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
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Siying Ye,Yonghui Zhang,Jun Chen,Fuquan Chen,Huifen Weng,Qiong Xiao,Anfeng Xiao
Agar is modified by chemical methods to improve its functional properties and meet the increasing demand of the market. Some of the functional properties of agar are improved after chemical modification, while other properties are reduced, especially gel strength. This study aimed to comprehensively improve the functional properties of agar through acylation and crosslinking by reacting with maleic anhydride. 13 C NMR indicated the maleylation reaction was preferred at the C2 hydroxyl group of D-galactose, and the crosslinking reactions occurred at the C2 and C6 hydroxyl groups of D-galactose in different agar chains. Interestingly, the maleylated agar monoester had higher gel transparency (1.5%, w/v) of up to 76% than the native agar (58%). However, it showed a significant decrease in gel strength from 783 g/cm 2 to 403 g/cm 2 , while crosslinking endowed agar with higher gel strength (845 g/cm 2 ) and gel transparency (78.4%). The high transparency of the modified agar plate made colony observation and colony counting easy. Maleylation of agar further enhanced the freeze–thaw stability of agar gel (24.8%, 7th freeze–thaw cycles). Overall, the maleylated agar possessed superior functional properties, and it could be used as food, bacteriological, and biotechnological agar.
研究领域:
食品科学
·
生物技术
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2023
·
IF 6.1
Yang Zhao,Luyue Zhang,Shiyu Zhang,Xing Zheng,Mingzhu Zheng,Jingsheng Liu
At presently, the catalytic activity of xylanase is sub-optimal, and the required reaction conditions are harsh. To improve its catalytic activity and stability, xylanase (XY) was chemically modified with maleic anhydride (MA). The enzymatic properties of this maleic anhydride-modified xylanase (MA-XY) were then evaluated and analyzed spectroscopically. The results showed that the thermal stability, use of organic solvents, storage stability and the pH range of 3.0 to 9.0 for MA-XY were better than that for XY alone. The kinetic parameters of the enzyme (K m values) decreased from 40.63 to 30.23 mg/mL. Spectroscopic analysis showed that XY had been modified by the acylation reaction to become a tertiary structure. An assay based on clarifying fruit juices showed that the clarification capacity and reducing sugar content using MA-XY increased compared with those using XY. Overall, this study provides a theoretical basis for improving the application of XY in the food industry.
研究领域:
食品科学
·
酶学
·
化学修饰
·
生物技术
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产品关联
DOI
PubMed
高影响因子
Journal of Macromolecular Science Part B-Physics
·
2017
·
IF 0.828
Shan Bai,Zhenzhong Ouyang
Direct graft copolymerization of maleic anhydride (MAH) onto poly(D,L-lactide-co-glycolide) (PLGA) was performed by use of benzoyl peroxide (BPO) as initiator. Fourier transform infrared spectra, nuclear magnetic resonance, titration analysis of maleation extent and water contact angle were employed to characterize the obtained MPLGA. The effects of monomer concentration, initiator concentration and reaction temperature on the degree of maleation were investigated. The MPLGA scaffold was obtained by using NaCl as the porogen. The results showed that maleic anhydride was successfully grafted onto the PLGA chains. The monomer and initiator concentrations played an important role in the graft copolymerization; the extent of maleation first increased with increasing content of MAH and BPO and then declined. The extent of maleation continuously increased with increasing temperature to 100°C, and then the rate of increase decreased. The extent of maleation could be controlled in the range from 0.15 to 0.71% by adjusting the graft copolymerization conditions. The introduction of anhydride enhanced the water contact angle of PLGA. The MPLGA scaffold showed a network of interconnected pores ranging from 50 to 300 μm.
研究领域:
高分子化学
·
生物材料科学
·
高分子改性
·
组织工程
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DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2014
·
IF 2.083
Mengmeng Liang,Yonghong Hu,Xiang Liu,Jun Guan,Wenge Yang,Yan Liu
The solubilities of maleic anhydride in methanol + (acetone, ethyl acetate) mixed solvents were measured within the temperature range of 278.15–323.15 K at atmospheric pressure by the gravimetric method. The solubility of maleic anhydride in those mixed solvents increased with increasing temperature, but the rate of solubility is different. In addition, the solubility of maleic anhydride also increased with the increasing mass fraction of methanol. The experimental data were well-correlated with the modified Apelblat equation, the λh equation and the van't Hoff equation. Moreover, the calculated solubilities shown good agreement with the experimental results. It was found that the modified Apelblat equation could obtain the better correlation results than the other two models. The thermodynamic properties of the solution process, including the enthalpy, and entropy were calculated by the van't Hoff analysis and they were positive. What's more, the experimental data and model parameters would be useful for optimizing the process of purification of maleic anhydride in industry.
研究领域:
化学工程
·
热力学
·
物理化学
·
分离过程
·
工艺优化
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DOI
高影响因子
危险品化学品经营许可证（带存储）