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 Energy Chemistry
·
2021
·
IF 9.676
Ming-Xin Song,Li-Jing Xie,Jia-Yao Cheng,Zong-Lin Yi,Ge Song,Xiao-Yang Jia,Jing-Peng Chen,Quan-Gui Guo,Cheng-Meng Chen
Starch, as a typical polysaccharide with natural spherical morphology, is not only a preferred precursor for preparing carbon materials but also a model polymer for investigating thermochemical evolution mechanisms. However, starch usually suffers from severe foaming and low carbon yield during direct pyrolysis. Herein, we report a simple and eco-friendly dry strategy, by maleic anhydride initiating the esterification of starch, to design carbon microspheres against the starch foaming. Moreover, the influence of ester grafting on the pyrolytic behavior of starch is also focused. The formation of ester groups in precursor guarantees the structural stability of starch-based intermediate because it can promote the accumulation of unsaturated species and accelerate the water elimination during pyrolysis. Meanwhile, the esterification and dehydration reactions greatly deplete the primary hydroxyl groups in the starch molecules and thus the rapid levoglucosan release is inhibited, which well keeps the spherical morphology of starch and ensures the high carbon yield. In further exploration as anode materials for Lithium-ion batteries, the obtained carbon microspheres exhibit good cyclability and rate performance with a reversible capacity of 444 mAh g −1 at 50 mA g −1 . This work provides theoretical fundamentals for the controllable thermal transformation of biomass towards wide applications.
研究领域:
材料科学
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能源科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Jian Lv,Chenxi Zhu,Haonan Qiu,Jing Zhang,Changdong Gu,Jie Feng
In severely cold regions, it is very difficult to prevent the formation of ice on solid surfaces, even on superhydrophobic (SH) surfaces. Compared with anti-icing surfaces, icephobic surfaces are more useful in practice. In this work, a traditional epoxy coating was modified by using maleic anhydride (MAH) as a crosslinking agent, in addition to filling a small amount of epoxy resin grafted with fluorine containing chains (FEP). The wettability and the mechanical properties of the modified coating, as well as the adhesive strength of ice on the coating surface and the stability of the icephobic properties of the coating, were systematically studied. The results showed that the modified coating surface became more hydrophobic and the force required to remove ice from the surface was less than that needed for removing on the unmodified coating surface. Furthermore, the modified coating has excellent mechanical properties. After sanding with abrasive paper, the unmodified coating surface is more hydrophilic, whereas the modified coating surface retains its hydrophobicity. X-ray photoelectron spectroscopy (XPS) indicates that compared with crosslinking by traditional polyamides, crosslinking using MAH greatly reduces the number of polar groups on the coating surface. The FEP introduction further reduces the free energy of the coating surface. As a result, the modified epoxy coating exhibits excellent icephobic performance. This study will be helpful for the design of icephobic epoxy coatings for use in practical applications. For example, it may make the de-icing on the underside of trains running in cold regions becomes more easily.
研究领域:
材料科学
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表面工程
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产品关联
DOI
高影响因子
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
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Dingyuan Zheng,Zehuai Li,Wenrui Yao,Yuning Wang,Ce Sun,Haiyan Tan,Yanhua Zhang
Wood has garnered renewed interest due to its capacity to reduce carbon emissions when replacing non-renewable materials. Wood modification is often necessary because achieving optimal performance solely from the wood itself is challenging. Strategies for wood modification fall short of being genuinely sustainable and eco-friendly. In this context, a catalyst-free esterification method mediated by maleic anhydride (MA) is introduced for modifying wood. Notably, this approach aligns with principles of recycling, reuse, and reduction. A comprehensive comparison of MA-mediated wood esterification versus TEMPO-mediated wood oxidization highlights the effectiveness and superiorities of the MA esterification approach. Delignified wood esterified by MA (MA-DW) exhibits higher charge content (2.42 ± 0.24 vs. 0.53 ± 0.08 mmol/g), superior mass gain (18.4 ± 2.6 wt% vs. −15.92 ± 3.5 wt%), efficient recycling capability of the reaction medium (MA could be recycled five times, while TEMPO cannot be recycled), and integrity of the final products (retaining intact geometry vs. complete disintegration) compared to TEMPO-oxidized delignified wood (TEMPO-DW). Moreover, the MA-DW platform can serve in energy storage applications as an electrode or in sewage remediation applications as a catalyst. The esterification method mediated by MA provides an eco-friendly pathway for modifying wood, serving as a platform for creating diverse materials, potentially offering innovative concepts and insights for wood modification research.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Green Chemical Engineering
·
2022
·
IF 0
Yumei Liu,Shengxin Chen,Ran An,Xingsheng Wang,Ruixia Liu
The sustainable synthesis of dimethyl maleate via diesterification through the utilization of ionic liquid (IL) is of great importance. However, the relationship between the ILs nature and the reactivity of diesterification is still unclear. Herein, a series of ILs with different structures were selected for the comprehensive investigation of diesterification. The acidity (H 0 ) and Kamlet-Taft solvent parameters (hydrogen bond donor ability (α), hydrogen bond acceptor ability (β), and polarizability (π∗)) of ILs were measured by UV–Visible spectroscopy, and the effects of them on the diesterification of maleic anhydride were also studied in detail. The results indicated that not only H 0 of the IL-based catalysis system, but also its α, β, and π∗ influenced the reaction activity of diesterification. Furthermore, a quantifiable correlation was fitted between the natural logarithm of the rate constant and multiple parameters of ILs, indicating that the diesterification rate had a positive correlation with the H 0 , α, and π∗, and inverse correlation with the β of the IL. A plausible synergetic reaction mechanism for the excellent performance of [(HSO 3 )PMim][HSO 4 ] has been proposed. Overall, this work thoroughly explored the relationship between the nature of ILs on diesterification in-depth, which will reveal the nature of diesterification in detail.
研究领域:
化学工程
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催化化学
✓ 已验证
DOI
APPLIED CATALYSIS A-GENERAL
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2015
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IF 3.942
Yangqiang Huang,Yao Ma,Youwei Cheng,Lijun Wang,Xi Li
Ruthenium-based catalysts were prepared by a biogenic method via Cacumen Platycladi leaf extract and tested in the liquid phase hydrogenation of maleic anhydride to the corresponding succinic anhydride. The reaction conditions were optimized by varying the Ru loading, reaction temperature, hydrogen pressure, reaction time and organic solvents to achieve the superb catalytic performance. Reusability tests and comparison with commercial catalysts were also studied on the biosynthesized Ru-based catalysts. Furthermore, a variety of characterization techniques, such as TEM, HRTEM, EDS and XPS showed the effectively introduction of ruthenium nanoparticles into the carbon supports. The analyses of FTIR and TG confirmed that the plant extract served as both reducing and protecting agents..
研究领域:
催化化学
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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 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
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF CATALYSIS
·
2022
·
IF 8.047
Haoyu Li,Pengfei Wu,Xianquan Li,Jifeng Pang,Shangru Zhai,Tao Zhang,Mingyuan Zheng
High-performance MFI zeolite supported nickel catalysts were prepared by the ammonia evaporation method for maleic anhydride (MA) conversion to γ-butyrolactone (GBL). According to comprehensive characterizations, the Ni catalysts possessed petal-like morphology and hierarchical structures with meso and micro pores. Nickel species were highly dispersed on the silica support and generated abundant Lewis acid sites (LAS), which effectively activated carbonyl groups in the reactant and accounted for the high activity in MA hydrogenation. Zr species hydrothermally introduced into the catalyst increased the number of LAS and decreased the apparent activation energy for the reaction. The highest GBL yield reached 95.6% over 40Ni-2Zr-MFI with the assistance of 3A zeolite to in-situ remove water byproduct. The catalyst showed reasonably good stability in five-cycle operation thanks to the strong interaction between Ni and support. The reaction route for MA hydrogenation was investigated, in which succinic anhydride (SA-A) served as the major reaction intermediate for GBL formation.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kexia Jin,Da Zhang,Binqiang Pan,Khak Ho Lim,Tiffany Abitbol,Wen-Jun Wang,Xuan Yang
With nano-dimension, high aspect ratio, and high mechanical properties, cellulose nanofibrils (CNFs) are emerging sustainable nanomaterials with potential applications in films and composites. However, their preparation often involves a series of chemical treatments such as delignification, bleaching and harsh chemical pretreatments, and treats lignin as waste. Herein, we report a sustainable method to prepare high-quality lignin-containing cellulose nanofibrils (LCNFs) from bamboo chips, using a one-step maleic anhydride esterification treatment without any toxic organic solvent or catalyst. The resultant LCNFs have high lignin content (24%), high surface charge (2.25 mmol/g), fine diameter (∼2.5 nm), and high aspect ratio (>400). These superior properties can be translated into the corresponding nanopaper films with high optical transmittance (85% at 600 nm), UV shielding (<10% transmittance at 200–350 nm), hydrophobicity (water contact angle 75°), thermal stability (maximal weight loss temperature at 338 °C), and mechanical properties. Importantly, such films show the best reported tensile strength (290 MPa) among all the LCNF films, and it still outperforms conventional CNF films after 5 rounds of recycling. Furthermore, as sustainable nanofillers, such LCNFs can be directly incorporated into a hydrophobic polyester matrix, and significantly enhances the UV shielding and mechanical properties of the final nanocomposites. Altogether, with eco-friendly production and multiple functions, these LCNFs are a new class of nanocelluloses with high industrial relevance.
研究领域:
材料科学
·
可持续化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Tianle Xu,Xinran Ju,Hui Tang,Wenli Xiang
Fir wood was modified using epoxy soybean oil, diethylene glycol, and maleic anhydride as raw materials to enhance its mechanical properties, thermal stability, and water resistance. Diethylene glycol first opens the epoxy ring of the soybean oil and then reacts with maleic anhydride to produce an esterification reaction. The product modifies the fir wood through a chemical impregnation method. A systematic evaluation of the modified wood’s weight gain ratio, density, mechanical properties, thermal stability, water resistance, and microstructural changes was conducted. The results show that the compressive strength increased from 38.1 to 94.9 MPa, the water absorption rate decreased from 158.03 to 6.93%, and the thermal stability was also enhanced. This study provides a simple, low-cost, and green method for improving the comprehensive performance of fast-growing fir wood, offering new insights for achieving sustainable development and green chemical engineering.
研究领域:
木材科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2021
·
IF 4.43
Ying Xiao,Zhao-Yang Wang,Shi-He Luo,Jian-Yun Lin,Xi-Ying Cao,Yong-Gan Fang
Polylactic acid (PLA) is highly attractive polyester in biomedical application, and its thermosensitive materials can achieve multiple functions due to their being sensitive to the temperature. In this work, based on lactic acid (LA), maleic anhydride (MAH), and N -isopropyl acrylamide (NIPAM), a thermosensitive modifier, the thermosensitive PLA material PLAMN is directly synthesized via one-pot preparation of melt polymerization and radical polymerization . The molecular structure, thermosensitive characteristics, and micellization behavior of the serial PLAMNs with different molar feed ratios are well characterized with FTIR, 1 H NMR, GPC , DLS , TEM and other characterization techniques. The results show that, as anticipated, the obtained products have the ability to self-assemble. The specific physical and chemical properties can be controllable by the molar feed ratio n (LA)/ n (MAH)/ n (NIPAM). When the ratio is 20/1/7, the obtained PLAMN 7 has the minimum critical micelle concentration (only 4.17 mg L −1 ), and its critical phase transition temperature is 30.6 °C. This new synthetic strategy can effectively simplify the preparation of the thermosensitive PLA polymeric material, which is beneficial to realize the loading of the hydrophobic drugs.
研究领域:
材料科学
·
生物医学工程
✓ 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）