Catalysis Science & Technology
·
2024
·
IF 4.4
Muhammad Faizan,Erum Aamir,Tiong Sieh Kiong,Hua Song
Vanadium phosphorus oxide (VPO) catalysts are synthesized for utilization of lighter alkanes such as n-butane to produce maleic anhydride (MA) by a selective oxidation process. Such a process has received huge global attention because of greater selectivity, eco-friendliness and being a less-expensive process as compared to the benzene oxidation process for the production of MA. Herein, we introduced for the first time 2-D MXene Ti3C2 (Mx) into VPO synthesis and prepared Ti3C2@VPO (MXene@VPO; Mx@VPO) nanocomposites via solvothermal and ball milling processes as a promoter and supporter at different (1–5) wt% for the evolution of n-butane selective oxidation. Among them, the solvothermal based promoted catalyst (5% Mx@VPO) exhibited large MA selectivity (up to 11%) as compared to the unpromoted catalyst. Simultaneously, it will decrease the COx selectivity (CO2 and CO). More importantly, the CO : CO2 ratio is reduced up to 1.5 from 2.01, which is beneficial for the environment and chemical plants. From various characterization techniques such as BET, XPS, SEM, TEM, XRD, FT-IR, NH3-TPD, H2-TPR, EDS, EPR, Raman, and TG/DTA we confirmed the role of MXene as a structure directing agent and electron promoting agent in VPO catalysis.
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yuhang Fang,Menglong Niu,Yue Ji,Yongli Yan,Ben Niu,Xiaohua Chai,Baoqi Ma
To address the bottleneck of insufficient fuel density in Coal Tar (CT), this study proposes a molecular group-oriented ring expansion modification strategy to enhance the content of condensed polycyclic aromatic hydrocarbons (PAHs) and optimize hydrogenation processes for high-density fuel production. Three modifiers—furan (FA), maleic anhydride (MA), and NA anhydride (NA)—combined with Lewis acid catalysts (AlCl 3 , FeCl 3 , etc.) were employed to modify low- and medium-temperature CT. The modified products were characterized using GC–MS, FT-IR, Raman spectroscopy, and 13 C NMR. Fuel performance was evaluated via density, viscosity, calorific value, and hydrogenation experiments under optimized conditions with a Ni-Mo/γ-Al 2 O 3 catalyst. Post-modification, the tricyclic aromatic hydrocarbon content increased by 20 %, the condensed aromatic peak area rose by 450 %, and the graphitization degree improved by up to 120 %. MA demonstrated the best modification effect, yielding a hydrogenated product with a density of 0.9547 g/mL and a calorific value of 42.2 MJ/kg. Kinetic analysis identified AlCl 3 -catalyzed reactions at 100 °C for 24 h as optimal, involving synergistic Diels-Alder and Friedel-Crafts alkylation mechanisms. This work pioneers a molecular group-oriented ring expansion strategy for CT, overcoming the limitations of traditional hydrogenation in enhancing ring numbers and offering a novel pathway for coal-based high-density fuel development.
研究领域:
能源化学
·
催化反应工程
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DOI
高影响因子
Polymers
·
2025
·Vol. 17
·期 19
·2586
·
IF 4.9
Jia-Ning Meng,Dan Qiu,Tao Yuan,Ya Li,Huang Huang,Ling-Hui Wang,Ya-Juan Wang,Rui Wang,Chang-Zi Jin
Cellulose nanofibers (CNFs) are highly promising nanocarrier materials, boasting excellent drug adsorption and loading potential due to their tunable hydrophilic/lipophilic interfaces. This study is the first to report the successful synthesis of maleic anhydride-modified CNFs (MA-CNFs) via the esterification of CNFs using a solvent-free molten maleic anhydride (MA) system, and it systematically evaluates MACNFs’ dual adsorption performance for water-soluble and lipophilic drugs. A new characteristic peak at 1723 cm −1 in FT-IR confirms the formation of ester bonds, proving the successful grafting of MA onto CNFs. XRD analysis shows that the crystallinity slightly increases from 72.56% to 74.06%, indicating the reaction mainly occurs in the amorphous region. After modification, the material’s hydrophobicity is significantly enhanced (water contact angle: ~63.3° for CNFs vs. ~74.9° for MA-CNFs), and its BET specific surface area rises sharply from 5.03 to 26.29 m 2 /g. These structural advantages collectively enable MA-CNFs to have adsorption capacities for folic acid (FA, water-soluble) and vitamin E acetate (VEA, lipophilic) that are 1.15 and 2.04 times those of CNFs, respectively. The results demonstrate MA-CNFs are high-performance functional materials fabricated via a green method, with good biocompatibility.
研究领域:
纳米医学
·
药物递送
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生物材料
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高分子化学
·
药剂学
·
表面改性
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DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2026
·
IF 2.7
Yuan Tao,Wu Jing-Yi,Li Ya,Meng Jia-Ning,Qiu Dan
The processing and modification of microcrystalline cellulose (MCC) are highly challenging due to its highly crystalline nature restricting its broader application. This study used NaOH/urea aqueous solution for the graded regeneration of MCC, which effectively disrupted its dense crystalline structure and exposed the additional free hydroxyl groups. A modified secondary regenerated cellulose derivative (MA-SRC) with a 0.182 degree of substitution (DS) was produced using esterification with maleic anhydride. The sequential regeneration and modification with maleic anhydride increased the specific surface area of MCC from 6.87 to 8.66 m 2 /g. Comprehensive characterisation revealed that MA-SRC had unchanged crystalline phases, with reduced crystallinity and significantly improved hydrophobic properties. However, the difficulty in testing the mechanical properties of MCC alone (requires matrix support for moulding) required the incorporation of polylactic acid (PLA) to investigate the characteristics of the composite material further. Compared to PLA/MCC and PLA/SRC, the tensile strength of PLA/MA-SRC increased by 10.89% and 9.12%, and its elongation at break improved by 35.24% and 33.33%, respectively. Additionally, esterification significantly improved the contact angle. Consequently, these results confirmed that the synergistic graded regeneration–esterification strategy effectively enhanced the interfacial compatibility between MCC and PLA, which provided a novel approach for developing high-performance MCC-based composites. Graphical abstract The alternative text for this image may have been generated using AI.
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DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 8
·872
·
IF 2.935
Yongxian Zhao,Chen Ma,Shijie Cheng,Wei Xu,Yuejuan Du,Yansong Bao,Zuojie Xiao
Maleic anhydride (MAH)–divinyl benzene (DVB) multi-monomer melt-grafting onto isotactic polybutene-1 (iPB-1) was carried out in a torque rheometer. The effects of dicumyl peroxide (DCP), MAH, and DVB concentrations, and temperature, on the reaction, were investigated. The optimized conditions were 170 °C, DVB/MAH = 4:6 (mass ratio). DVB as a comonomer enhanced the grafting degree (Gd) and grafting efficiency (Ge) of iPB-g-MAH better than styrene. The initiator DCP had little effect on Gd as its concentration over 0.2 phr, but the grafts’ melt flow rate (MFR) increased significantly, and relative molecular weight decreased remarkably with increased DCP concentration. With increasing Gd, the contact angle of grafts with water decreased, and there was a larger crystallization rate. The study of iPB-1 and iPB-g-MAH (Gd = 1.5%)-modified polyamide 6 (PA6) showed that iPB-g-MAH had an obviously toughening effect on PA6. With increasing iPB-g-MAH concentration, the blends of impact strength and elongation at break increased obviously, tensile strength decreased slightly, and MFR decreased prominently, which greatly slowed the processing degradation of PA6. The properties of iPB-1/PA6 blends deteriorated. Both DSC curves and SEM micrographs confirmed that PA6/iPB-g-MAH blends had much better compatibility than PA6/iPB. The reason was that the anhydride group in iPB-g-MAH reacted with amide group in PA6 to improve the compatibility between two phases, and iPB-g-MAH is an excellent modifier for PA6.Keywords:isotactic polybutene-1;maleic anhydride;divinyl benzene;polyamide 6;modification
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
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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DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2246
·
IF 4.6
Cuichuan Zhang,Zhiqiang Lu,Bin Wu,Shu-Dong Jiang,Jiasheng Qian
Poly(vinylidene fluoride) was grafted with maleic anhydride through reactive extrusion by using diisopropyl benzene peroxide as an initiator and 9-vinyl anthracene as a stabilizer. Effects of various parameters on grafting degree were investigated including the amounts of monomer, initiator and stabilizer. The maximum extent of grafting achieved was 0.74%. The graft polymers were characterized using FTIR, water contact angle, thermal, mechanical and XRD studies. Improved hydrophilic and mechanical properties were observed for graft polymers.Keywords:PVDF;MAH;stem grafting;melt extrusion
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Yueling Xu,Xiujuan Gao,Han Yu,Yanjun Ding,Qinglin Li,Chengju Sheng,Mingming Guo
Polymeric materials exhibiting room-temperature phosphorescent (RTP) have attracted wide attention for their easy synthesis, low toxicity, and applications in various fields such as data encryption, cell imaging, information security and other fields. Nevertheless, the conventional ways of preparing such materials are mainly focused on doping, which may suffer from phase separation, poor compatibility, and lack of effective methods to promote intersystem crossing and suppress the nonradiative deactivation rates. Herein, a series of polymers with fluorescence and phosphorescence dual emission were prepared by simple radical solution copolymerization. Through rigid ion-bonded cross-linked networks and cross-linked hydrogen-bonded networks between the polymer chains, the non-radiative jumps and achieve ultra-long phosphorescence lifetimes were able to suppress. By suppressing non-radiative transitions through rigid ion-bonded cross-linked networks and intermolecular hydrogen-bonding networks between polymer chains, ultra-long phosphorescence is achieved. Impressively, a LRTP lifetime of up to 815.38 ms in polymers under ambientconditions is set up. Moreover, in this study, phosphorescence emission can be easily tuned by balancing ion radius and charge states. These results outline the construction of polymeric materials, endowing traditional polymers with new characteristics and promising potential applications.
研究领域:
材料科学
·
聚合物化学
·
光电材料
·
发光材料
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DOI
高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 6
·1867-1880
·
IF 2.3
Xue Tao,Yu Caili,Zhou Zhongqun,Zhang Faai
Achieving functional styrene–maleic anhydride (SMA) copolymer dispersant is highly attractive but still remains a challenge. Conventional modified SMA dispersants have complex modification steps, poor performance, and limited applications. Thus, a series of styrene–maleimide (SMI) copolymers with different functionality as amphiphilic dispersants for dispersing nano-SiO 2 in an aqueous solution were synthesized using a simple preparation process. The changes in the maleic anhydride groups during imidization were tracked using FTIR spectroscopy, 1 H-NMR, and GPC. A rotational viscometer and an inverted bottle method were used to measure the viscosity and coagulation time of the nano-SiO 2 aqueous dispersion system, respectively, after adding the SMI dispersants. The particle size, size distribution, and dispersant adsorption amount of the dispersion were analyzed using laser particle size analysis; FTIR spectroscopy and SEM; and TGA, respectively. The results showed that the hydrogen bonds formed between the amino groups in the dispersant and the hydroxyl groups on the SiO 2 surface during stirring allowed the dispersant to be adsorbed onto the SiO 2 surface after being added to the nano-SiO 2 aqueous system. The addition of the SMI dispersant enhanced the steric hindrance and electrostatic repulsion between the nanoparticles, thus making it possible for the SiO 2 nanoparticles not to easily aggregate in water, improving their dispersity and stability. Additionally, the type and amount of SMI dispersant used significantly affected the SiO 2 nanoparticles' ability to disperse in water. This makes SiO 2 particles convenient to use and transport, not produce dust pollution, and easy to store. Graphical abstract
研究领域:
高分子化学
·
纳米技术
·
材料科学
·
表面化学
·
胶体科学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Xiaoping Yang,Dongzhi Yang,Xiaolei Zhu,Jun Nie,Guiping Ma
Developing natural polymers-based fibers is highly desirable for tissue engineering. In this study, an effective method to synthesize electrospun gelatin/dextran–maleic anhydride (gelatin/Dex-MA) composite fibers with enhanced physical and biological properties has been proposed. Photocrosslinkable Dex-MA was first synthesized and gelatin/Dex-MA composite fibers were then prepared by electrospinning followed by photocrosslinking. The physical properties of the as-synthesized composite fibers including water absorption, mechanical properties, and degradation were investigated. It was found that the physical properties of the composite fibers could be dramatically improved with the content of Dex-MA, where the tensile strength can be enhanced up to 1.75 MPa and the degradation can be increased up to 40.30%. In addition, the biocompatibility study in vitro showed that the composite fibers could support cell proliferation and adhesion. Our electrospun crosslinked gelatin/Dex-MA fibers are potential to be applied in the field of tissue engineering.
研究领域:
生物材料学
·
组织工程学
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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
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DOI
PubMed
高影响因子
Polymers
·
2023
·Vol. 15
·期 4
·952
·
IF 5
Qing Zhang,Yongguang Gao,Baojing Luo,Yan Cui,Shili Shu,Wei Chen,Lei Wang
Poly(butylene succinate-butylene terephthalate) (PBST) and polylactic acid (PLA) are both biodegradable polymeric materials. PBST has good ductility but low strength, while PLA exhibits high strength but poor toughness. Based on the complementary mechanical properties of the two polymers, PBST/PLA blends were prepared by melt blending in the mixing chamber of a torque rheometer using styrene-maleic anhydride copolymer (PSMA) as a compatibilizer. The effects of different contents of PSMA on the crystalline properties, thermal properties, mechanical properties, rheological behavior, and morphology of PBST/PLA blends were investigated. The results showed that the addition of PSMA improved the compatibility between PBST and PLA. When the amount of PSMA is 3–4 wt%, the comprehensive mechanical properties of the blends are optimal, and the tensile strength was increased by 61.7% compared with the binary blend without PSMA. Additionally, rheological tests illustrated that the blends exhibited a typical shear-thinning behavior and belonged to pseudoplastic non-Newtonian fluids.Keywords:poly(butylene succinate-butylene terephthalate);polylactic acid;styrene-maleic anhydride copolymer;blends
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）