INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Maojiang Yue,Guangju Qiu,Li Wang,Wantai Yang
The synthesis and application of thickening polymers for aqueous solutions are crucial in a multitude of industries. Herein, we propose the 4-dimethylaminopyridine (DMAP)-catalyzed esterification reaction between poly(styrene-alt-maleic anhydride) (SMA) and sugar (alcohol) for preparing a new type of thickening polymer. A thorough investigation of the esterification kinetics of SMA and sorbitol as well as the average reacted hydroxyl number (Ne) of sorbitol was conducted by a combination of Fourier transform infrared spectroscopy (FT-IR) and potentiometric titration. The present method can be extended to sugars, including sucrose and maltose, thus delivering SMA-g-sugar (alcohol) with diverse structures. The apparent viscosity of aqueous solutions thickened by SMA-g-sugar (alcohol) before and after further chain extension with diamine was evaluated by using a rotational rheometer. After chain extension with polyetheramine D230, great thickening property and excellent stability against thermal cycles and shear time can be achieved. The present method has broad compatibility, controllable polymer structure, and possibility for further chain extension, thus holding great prospect for preparing thickening polymers applied across different industrial sectors.
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高影响因子
Molecular Catalysis
·
2026
·
IF 4.3
Tong Yu,Junyu Zhao,Jie Zhang,Qian Li,Tangze Deng,Jinwei Chen,Gang Wang,Ruilin Wang
Vanadium phosphorus oxide (VPO) is regarded as the most efficient catalyst for the selective oxidation of n- butane towards maleic anhydride (MA). However, to a certain extent, its industrial applications are restricted by the “trade-off” effect between n -butane conversion and MA selectivity. Here, an iron phosphorus oxide (FePO) catalyst was synthesized using a modified molten salt method and characterized. The optimum Fe 0.25 PO catalyst achieved considerable catalytic performance with n -butane conversion of 59.77 %, MA selectivity of 59.07 %, and MA yield of 35.31 %. Various characterizations revealed the relationship between the catalytic performance and physicochemical properties such as the crystal structure, surface P/Fe ratio, oxygen species, and surface acidity. The results indicated that the ordered Fe(PO 3 ) 3 structure was the primary active phase for the Fe 0.25 PO catalysts, in which the abundant exposure of Fe 3+ sites and active oxygen species contributed to improving the reactivity and n -butane conversion. In addition, acid sites distribution, Lat-O/Sur-O, Fe 3+ /Fe 2+ , P/Fe, and O/Fe are critical factors for determining the activity and MA selectivity. The exploration of FePO catalysts offers a guideline for the development of high-performance catalysts to replace VPO for n -butane selective oxidation to MA.
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Journal of Energy Chemistry
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2021
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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.
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高影响因子
Journal of Flow Chemistry
·
2021
·Vol. 11
·期 4
·867-875
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IF 2.786
Liu Weiwei,Li Qian,Zhang Yin,Liu Tengfei,Wang Li,Li Huayi,Hu Youliang
Reversible addition-fragmentation chain transfer radical polymerization of styrene and maleic anhydride was successfully performed in continuous-flow microreactor. Results of the structural characterization showed that the obtained styrene-maleic anhydride (SMA) copolymers possessed controlled molecular weight, low dispersity and alternating structures. Subsequently, effects of the polymerization conditions, including reaction pressure, temperature, feed flowrate and tube length, on the polymerization kinetics and molecular structure of the SMA copolymers were investigated in detail. It was found that the reaction rate was increased as the reaction temperature increased within certain limits, as well as the feed flowrate due to the increased mass and heat transfer efficiency. Besides, first-order kinetics of the polymerization was observed when the reaction times were adjusted by only changing the tube length. Good stability was exhibited when the reaction conducted continuously for 10 h. This approach can reduce the reaction time significantly from several hours to about half an hour.
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高影响因子
Journal of Environmental Chemical Engineering
·
2020
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IF 4.3
John Michael Tesha,Derrick S. Dlamini,Saood Qaseem,Zhenyu Cui,Jianxin Li
Polysulfone–Styrene Maleic Anhydride (PSF/SMA) ultrafiltration (UF) membranes were prepared by the thermally induced phase separation (TIPS) method. The morphology of the UF membranes was fine tuned by varying the concentration of SMA. The surface of the membranes was then modified by dip-coating with β-cyclodextrin (β–CD) and Trimesoyl Chloride (TMC) to form tight UF membranes. The effects of β–CD on the separation performance, structure, and morphology of the flat sheet PSF/SMA membrane were examined. The tight UF membranes were characterized and then tested for the removal of Bovine Serum Albumin (BSA) and Congo red from water. The thickness was varied by increasing the concentration of β-CD. When increasing the concentration of β-CD from 2.0 % w/v to 8.0 % w/v, the thickness of the top layer increased from 8 μm to 18 μm, respectively. Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR) and X-Ray Photoelectron Spectroscopy (XPS) were used to confirm the successful deposition of the TMC and β-CD at the surface of the membrane. It was also established through Atomic Force Microscopy (AFM) that the roughness of membranes increases with an increase in β-CD concentration. The contact angle of the tight UF PSF/SMA blend membranes declined from 79.8° to 55.9° at the addition of β-CD implying that the hydrophilicity of the membranes improved. The lowest pure water flux of 40 Lm −2 h -1 was achieved by the membrane coated with 8.0 % w/v of β-CD. However, the highest pure water flux of 127 Lm −2 hr −1 was observed on the uncoated PSF/SMA UF membrane at 3 % wt/wt SMA. The highest BSA rejection (94 %) was recorded from PSF/SMA with a coating layer containing 8 % wt/v of β-CD concentration. Furthermore, the maximum Congo red dye rejection (96 %) was achieved by the tight UF membrane when β-CD concentration was 8 wt/v and the SMA was 3 % wt/wt.
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高影响因子
ACS Applied Polymer Materials
·
2022
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IF 4.855
Xu Yang,Hong Zhao,Chunyang Li,Xindong Zhao,Jiaming Yang,Xuan Wang
Polypropylene (PP), as a recyclable thermoplastic polymer, is a promising insulating material for application as an environmentally friendly insulation layer in high-voltage-direct-current (HVDC) cables. However, the lack of toughness and the poor wide-temperature-range electrical properties under a DC electric field seriously restrict its development and application. Herein, a block polypropylene with a low elastic modulus is selected and grafted with organic molecules of maleic anhydride (MAH) and 4-tert-butylstyrene (St*) as a masterbatch (PP-g-(St*-co-MAH)) by an ultraviolet-irradiated radical reaction. The modified b-PP with different grafting contents was prepared by diluting the masterbatch through melt blending, and their DC electrical properties at a wide temperature range of 40–100 °C were tested. The results indicate that the introduction of a comonomer St* significantly improves the grafting rate of MAH and suppresses the degradation of PP chains during the grafting reaction; thus, the PP-g-(St*-co-MAH) possesses improved thermogravimetric performance and maintains the original mechanical properties and workability. The grafted functional groups introduce deep charge traps into the matrix and thus effectively suppress the space charge injection and accumulation, significantly reduce the conductivity, and enhance the breakdown strength of PP at wide temperature ranges. Among the tested materials, the PP grafted with 0.57 wt % St*-co-MAH exhibits the best electrical properties, while inadequate or excessive grafting content of St*-co-MAH relatively weakens the positive effects of grafting modification. The mechanism is analyzed based on calculation of the trap level and the three-dimensional (3D) electric potential.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2013
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IF 3.473
Zhimin Zhu,Fengqiang Sun,Liting Yang,Kaiyuan Gu,Weishan Li
Photo-initiated dispersion polymerization, a photochemical method for preparing poly (styrene-co-maleic anhydride) microspheres, is introduced for the first time in this paper. Ultraviolet lamp, ethanol/water mixture, 2,2-azobisisobutyronitrile, and poly (vinylpyrrolidone) were respectively used as the light source, green solvent, initiator, and stabilizer in the preparation. After careful study of the influencing factors, formations, sizes and size distributions of the microspheres were found to systematically vary with light intensity and amount of reagents used. Under the optimal conditions, microspheres with the narrowest size distribution and sizes smaller than 1 μm were obtained. Based on the functional groups contributed by the MAH , an important application of the prepared microspheres in Ni 2+ adsorption was explored. Adsorption capacities were controlled by the MAH amount added in the microsphere preparation.
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SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
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IF 8.1
Xuyang Li,Yingke Zhang,Shuyi Li,Xiaojing Xing,Xinfeng Cheng,Lin Wang,Xianchao Du,Shuai Li,Dongfang Qiu,Meng Guo
Mixed-matrix membranes (MMMs) show great potential for application in hydrogen separation study. However, the MMMs prepared by the traditional strategy have the imperfect compatibility of the matrix and fillers, and the non-ideal microstructure, undergoing a trade-off between permeability and selectivity. Herein, we report a new in-situ limited filling method to improve the H 2 /CH 4 separation performance of the maleic anhydride grafted polypropylene (MAPP) membranes medicated by a series of cyclodextrins (CDs). The introduction of CDs can better loosen the MAPP microstructure and ensure that the nanocomposite membranes have excellent H 2 permeabilities. The two-time limited filling can further compensate for the microvoids or defects in the membrane microstructure, thereby improving the H 2 /CH 4 separation stability of the nanocomposite membranes. The H 2 /CH 4 selectivities of the α-CD/MAPP, β-CD/MAPP, MEDβCD/MAPP, and γ-CD/MAPP are 7.1, 5.7, 6.3, and 5.1 times higher than that of pure MAPP membrane, respectively. This work provides a straightforward and effective strategy to fabricate homogeneous MMMs for gas separation.
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高影响因子
Micro and Nanostructures
·
2024
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IF 2.7
Lei He,Min Zhong
In this study, by adding Polyethylene-graft-maleic anhydride (PGMA) to the inorganic CsPbI 2 Br perovskite film, the coordination bonds and hydrogen bonds between PGMA and CsPbI 2 Br cooperate to passivate defects, regulate energy level and stabilize the perovskite structure and eventually improve the device performance. We systematically study the effects of PGMA addition on the morphology, structure, light absorption, defect concentration and carrier lifetime, hydrophobicity , and optical stability and room temperature black phase stability of CsPbI 2 Br films, and the photoelectric performance and air stability of PSCs , as well as their mechanism. The experimental results show that the addition of 3 wt% of PGMA greatly improves the photoelectric conversion efficiency (PCE) of CsPbI 2 Br PSCs by 40.19 % because of the synergistic passivation effects and energy level tuning. The hydrogen bonds between –CH 2 in PGMA and I − /Br − in CsPbI 2 Br, along with the coordination of carbonyl groups with Cs + /Pb 2+ , improve carrier transport and collection by inactivating flaw and managing the level, reducing the non-radiative recombination losses. In addition, the PSCs with 3 wt% of PGMA maintain 80 % of their initial efficiency even after 600 h in high humidity air environment due to the synergistic effect of coordination bonds and hydrogen bonds. Our study provides valuable insights into the use of PGMA to improve the performance of all-inorganic CsPbI 2 Br PSCs and the practicality of perovskite solar cells.
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
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IF 2.8
Mengmeng Xu,Chengzhong Zong
It is challengeable to obtain shape memory effect in the traditional thermoplastic vulcanizate (TPV) with sea-island microstructure. Herein, we successfully achieved shape memory behavior in the type of ethylene propylene diene monomer/polypropylene thermoplastic vulcanizate (EPDM/PP TPV) compatibilized by the graft products of magnesium maleic (MgMA) and maleic anhydride (MAH) on the interface of EPDM/PP. MgMA and MAH derived from the in situ neutralization reaction of maleic acid (MA) with magnesium oxide (MgO) and the dehydration reaction of MA respectively. In this paper, the mole ratio of MA and MgO on the performance of EPDM/PP TPV was studied. With the incorporation of MA and MgO, the mechanical property and shape memory performance were improved. The result of DMA, FTIR, and SEM verified the successful graft reaction of MgMA and MAH on the polymer chains. The compatibilized EPDM/PP TPV achieved the improved mechanical property of tensile strength (12.9 MPa) and elongation at break (583.5%), the increased R f of 96.2% and R r of 86.7% at the tailoring mole ratio of MA:MgO (1:1.5).
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JOURNAL OF ELASTOMERS AND PLASTICS
·
2026
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IF 2.4
Weiqiang Song,Junzhuang Li,Xingchu He,Luoru Zuo,Yican Xu,Pengdong Huang,Tengfei Yu,Shuaitao Wang,Peilong Guo,Kebing Wen
In this study, a series of polypropylene (PP)/high-entropy oxide (HEO)/maleic anhydride-grafted polyolefin elastomer (POE-g-MAH) ternary composites was prepared via melt blending, wherein POE-g-MAH was employed as a compatibilizer at loadings ranging from 0 to 5 phr. The microscopic morphology, crystallization behavior, mechanical properties, electrical properties, and insulation performance of the ternary composites were investigated using scanning electron microscopy (SEM), differential scanning calorimetry (DSC), X-ray diffraction (XRD), dielectric spectroscopy, and volume resistivity measurements. The results revealed an optimal compatibilizer loading at 2 phr, the tensile strength and modulus of the composites reached their peak values of 28.2 ± 3.1 MPa and 481 ± 22 MPa, representing increases of 97% and 39% compared to the 0 phr POE-g-MAH, respectively. Moreover, the degree of crystallinity of PP and the dielectric constant of the composite also reached their maximum values at this loading. The study indicates that the incorporation of POE-g-MAH enhanced the interfacial adhesion between PP and HEO, boosted the interfacial polarization effect, and promoted a better dispersion of HEO in the PP matrix, thereby highlighting its role as a heterogeneous nucleating agent. Furthermore, the impact strength of the composites increased continuously with increasing POE-g-MAH content.
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高影响因子
FUEL
·
2022
·
IF 8.035
Jianguo Zhuang,Siyan Yan,Peng Zhang,Xinhui Liu,Yitao Zhao,Yijun Yu,Yuchen Wang,Qichao Zhao,Haidan Wu,Xuedong Zhu,Fan Yang
Nickel (Ni) supported on MCM-41 zeolite as hydrogenation catalysts have been widely applied in various reactions, however, the synergism between Ni and the support remains obscure. To prepare more efficient catalysts and reveal the metal-support interaction, MCM-41 zeolite was modified with ammonium hexafluorosilicate (AHFS) before Ni loading. Results show that fluoride ions could selectively convert the vicinal silanols into isolated silanols on MCM-41 surface, which weakens the interactions between Ni precursors and the SiO 2 supports. Over the modified MCM-41 zeolites, the attenuated interaction results in the agglomeration of NiO particles that is more easily to be reduced, rather than the formation of nickel phyllosilicate which is extraordinarily difficult towards reduction. The easily-reduced Ni particles provided more adsorption sites for C C bond instead of C O bond, and the adsorption strength was also regulated. Therefore, the AHFS modified catalyst demonstrated a notable enhancement in hydrogenation of maleic anhydride (MA) into succinic anhydride (SA), presenting 98.4 % MA conversion and 99.8 % SA selectivity at 90 °C under 3.0 MPa H 2 . Moreover, the optimum catalyst was recycled for 5 runs to analyze the deactivation mechanism, it was found out that the loss of activities stems from the leaching of large Ni particles. Overall, our work shed light on the metal-support interactions for Ni/MCM-41 catalyst, determining the vicinal hydroxyl groups were responsible for the state of Ni species, which is helpful for the rational design of other hydrogenation catalysts.
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