AICHE JOURNAL
·
2026
·
IF 4.4
Shenhui Yu,Xingfen Huang,Xingyue Shi,Nemin Yang,Bangban Zhu,Haitao Wang,Jieyuan Zheng,Shengbin Shi,Deliang Wang,Qingyue Wang,Khak Ho Lim,Xuan Yang,Pingwei Liu,Wen-Jun Wang
Mechanistic understanding of polymerization kinetics at elevated pressure requires quantitative, time-resolved access to reaction dynamics. Herein, we developed an integrated framework coupling in situ high-pressure ATR-IR spectroscopy with a kinetic model based on the method of moments. Using ethylene/maleic anhydride (E (1)/MAH (2)) copolymerization as a benchmark, this platform enabled real-time quantification of monomer consumption and in situ determination of copolymer composition, directly confirming strict alternating incorporation. The kinetic model showed excellent agreement with experiments, with deviations below 10%. Analysis revealed the cross-propagation of MAH to ethylene-terminated radicals ( k 12 ≈ 5.62 × 10 3 L mol −1 s −1 ) is over an order of magnitude faster than the reciprocal step ( k 21 ≈ 3.92 × 10 2 L mol −1 s −1 ), identifying the latter as rate-determining. Extrapolation of the model guided the precise synthesis of a high-molecular-weight copolymer ( M w = 107 kDa). This work establishes a generalizable in situ platform for elucidating kinetics in complex polymerization systems at elevated pressure.
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高影响因子
Polymer Chemistry
·
2025
·
IF 3.9
Yiran Li,Debang Qi,Xuanhao Zhang,Mingsen Chen,Yanbin Huang,Wantai Yang
The Fischer-Tropsch (FT) synthesis is a platform technology to produce mixed olefins and alkanes with a wide range of carbon numbers. This study presented a terpolymerization strategy to directly transform over 60% of α-olefins in the FT products into high-value polymeric particles by self-stabilized precipitation (2SP) polymerization. Previously, we showed the possibility of the copolymerization of α-olefins and maleic anhydride (MA), but the polymerization was always a solution polymerization and the polymer products could only be obtained by using excess amount of precipitating solvent. In this study, vinyl acetate (VAc) was introduced as the third polar monomer, and our results showed that merely adding 20 wt% of VAc was sufficient to achieve 2SP polymerization, and obtain the FT heavy oil-MA-VAc (HMV) terpolymer particles with spherical morphology, smooth surface, narrow size distribution and high particle yield (≥ 70%). By adjusting the polymerization parameters, the HMV terpolymer particles with tunable particle size (0.2-2.0 μm) and molecular weights (2200-4700 g/mol) were prepared. Similarly, FT naphtha terpolymer particles were synthesized by adding 17 wt% VAc in the terpolymerization system. Overall, this study demonstrated the feasibility of producing nano-to-micron particles from FT mixed olefins through a simple 2SP polymerization, offering a promising route for the high-value utilization of FT products.
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高影响因子
Materials
·
2018
·Vol. 11
·期 3
·354
·
IF 2.467
Xinxin Liu,Tao Song,Minmin Chang,Ling Meng,Xiaohui Wang,Runcang Sun,Junli Ren
Introducing multifunctional groups and inorganic material imparts xylan-based hydrogels with excellent properties, such as responsiveness to pH, temperature, light, and external magnetic field. In this work, a composite hydrogel was synthesized by introducing acid treated carbon nanotubes (AT-CNTs) into the maleic anhydride modified xylan grafted with poly(N-isopropylacrylamide) (MAX-g-PNIPAM) hydrogels network. It was found that the addition of AT-CNTs affected the MAX-g-PNIPAM hydrogel structure, the swelling ratio and mechanical properties, and imparted the hydrogel with new properties of electrical conductivity and near infrared region (NIR) photothermal conversion. AT-CNTs could reinforce the mechanical properties of MAX-g-PNIPAM hydrogels, being up to 83 kPa for the compressive strength when the amount was 11 wt %, which was eight times than that of PNIPAM hydrogel and four times than that of MAX-g-PNIPAM hydrogel. The electroconductibility was enhanced by the increase of AT-CNTs amounts. Meanwhile, the composite hydrogel also exhibited multiple shape memory and NIR photothermal conversion properties, and water temperature was increased from 26 °C to 56 °C within 8 min under the NIR irradiation. Thus, the AT-CNTs reinforced MAX-g-PNIPAM hydrogel possessed promising multifunctional properties, which offered many potential applications in the fields of biosensors, thermal-arrest technology, and drug-controlled release.Keywords:carbon nanotubes;xylan-based hydrogels;mechanical property;thermo-sensitive properties
研究领域:
材料科学
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高分子化学
·
纳米技术
·
生物医学工程
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PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2015
·
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
·
材料科学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yindian Wang,Dong Chen,Guan Wang,Changwen Zhao,Yuhong Ma,Wantai Yang
A facile strategy to immobilize cellulase was developed in this work. Firstly, crosslinked styrene and maleic anhydride copolymer nanoparticles (SMN) were conveniently synthesized as carrier by self-stable precipitation polymerization in the absence of any stabilizer. Benefit from the high reactivity of anhydride groups, the cellulase was then covalently bound to SMN at mild condition. The optimum loading amount of cellulase on SMN was determined to be 167 mg/g. Although the immobilized cellulase showed almost no change of activity at temperature from 30 °C to 80 °C compared to free cellulase, its pH stability was significantly improved. After immobilization, the optimum pH shifted to 5.0 and immobilized cellulase could retain 80% activity at pH 8.0, which was much higher than that of free enzyme (14%). Furthermore, the immobilized cellulase showed excellent reusability in catalytic hydrolysis of carboxymethylcellulose sodium salt, preserving almost 100% activity after recycling 6 times and loss only 20% activity after 10 cycles. The results suggest that SMN is a promising carrier for enzyme immobilization.
研究领域:
生物化学
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材料科学
·
酶工程
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 34
·48986
·
IF 2.52
Wei Wei,Yingying Zhao,Bowen Zhang,Yuqing Cui,Xiaojie Li,Xiaoma Fei,Xiaoya Liu
Amino-modified silica nanoparticles (SiO 2 ─NH 2 ) were first prepared by hydrolytic condensation of tetraethyl orthosilicate and 3-aminopropylmethyldiethoxysilane. Then, organic–inorganic hybrid particles (SiO 2 ─SMA) were prepared by the amidation reaction between SiO 2 ─NH 2 and poly(styrene- alt -maleic anhydride) (SMA). Subsequently, SiO 2 ─SMA particles were employed for modifying bisphenol-A epoxy/anhydride thermoset. Compared with pure cured epoxy, the modified epoxy thermosets with only 1 wt % of SiO 2 ─SMA particles could achieve a simultaneous toughening and reinforcing performance. The tensile strength, impact strength, and fracture toughness of epoxy thermoset were increased by 14.1, 44.3, and 114.4%, respectively. Moreover, the modification also improved the thermal stability of epoxy thermosets, and the modulus and glass transition temperature of cured resin were not sacrificed. It can be attributed to the rigid structure of SiO 2 , as well as the anhydride and carboxyl groups onto the surface of SiO 2 ─SMA particles participating in the epoxy curing reaction and effectively enhancing the crosslinking density of epoxy thermoset.
研究领域:
材料科学
·
化学工程
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 26
·68467-68476
·
IF 5.8
Yu Kun,Guo Jiaqi,Li Bing,Guo Jianzhong
Sorption is prominent in low price, high efficiency, availability, and eco-friendliness. Organic porous materials have the characteristics of easy functionalization, diverse structure and stability, and show great potential in adsorption, energy storage, catalysis, and other fields. A mesoporous phenolic resin-type polymer (PRP) was successfully synthesized and modified by solid state reaction with maleic anhydride to prepare adsorbent (called as PRP-MAH) for sorption of Pb 2+ . The impact of reaction conditions (the pH value, reaction temperature, fresh concentration of solution, ionic strength and reaction time, etc.) was systematically studied. Characterization methods such as SEM, FTIR, and XPS indicated that the synthesized adsorbent PRP-MAH had regular morphology and good stability. The fitting of isothermal adsorption experiment data conforms to Langmuir sorption isotherm, and the sorption capacity reached 366.40 mg·g −1 at 308 K. The kinetic data were consistent with the quasi-second-order model, which indicated that the chemisorption might play the main role in the sorption process. Thermodynamic research manifested that the sorption of Pb 2+ by PRP-MAH was carried out by a spontaneous process at the study temperature. The studies show that PRP-MAH can remove Pb 2+ from water solution through ion exchange, electrostatic attraction, and surface complexation.
研究领域:
环境科学
·
材料科学
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PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ling Zhou,Weihua Zhang,Changwen Zhao,Wantai Yang
Developing coating materials with low cytotoxicity and high antimicrobial activity has been recognized as an effective way to prevent medical device-associated infections. In this study, a maleic anhydride terpolymer (PPTM) is synthesized and covalently attached to silicone rubber (SR) surface. The formed coating can be further cross-linked (SPM) through the self-condensation of pendent siloxane groups of terpolymer. No crack or delamination of SPM was observed after 500 cycles of bending and 7 day immersion in deionized water. The sliding friction force of a catheter was reduced by 50% after coating with SPM. The SPM coating without adding any extra antibacterial reagents can kill 99.99% of Staphylococcus aureus and Escherichia coli and also significantly reduce bacterial coverage, while the coating displayed no antimicrobial activity when maleic anhydride groups of SPM were aminated or hydrolyzed. The results of the repeated disinfection tests showed that the SR coated with SPM could maintain 87.3% bactericidal activity within 5 cycles. Furthermore, the SPM coating only imparted slight toxic effect (>85% viability) on L929 cells after 36 h of coculture, which is superior to the coating of aminated SPM conjugated with the antimicrobial peptide E6. The terpolymer containing maleic anhydride units have great potential as a flexible and durable coating against implant infections.
研究领域:
材料科学
·
生物医学工程
·
微生物学
·
表面化学
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DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2023
·
IF 8.7
Jingfan Zhang,Yifang Hua,Jian Liu,Tao Zhu,Jun Sun,Xiaoyu Gu,Hongfei Li,Jingmao Zhao,Sheng Zhang
Organic-inorganic hybrid particles have been prepared by grafting styrene maleic anhydride copolymer (SMA) onto reactive amino-modified silica nanoparticles. The SMA modified SiO 2 (SMA-SiO 2 ) was incorporated into polycarbonate (PC)/acrylonitrile-butadiene-styrene (ABS) composites (4:1, wt%/wt%) with bisphenol A bis (diphenyl phosphate) (BDP) to simultaneously improve the mechanical properties and flame retardancy. The mechanical properties of the sample containing SMA-SiO 2 are apparently improved compared with that of samples containing unmodified SiO 2 . It is found that SMA-SiO 2 tends to distribute at the phase interface of PC/ABS, and therefore improves the compatibility between PC and ABS . Besides, the peak of heat release rate (PHRR) and the total smoke production (TSP) of the PC/ABS composites are decreased by the presence of SMA-SiO 2 . It is suggested that SMA-SiO 2 can form a flame retarding shell at the phase interface to protect ABS. In summary, both the mechanical properties and flame retardancy of PC/ABS composites are significantly improved due to the selective distribution of SMA-SiO 2 .
研究领域:
材料科学
·
高分子化学
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高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 1
·e54763
·
IF 3
Yupeng Su,Kehui Han,Martin Hoch,Jie Mao,Xinyan Shi
Moisture crosslinking would be a good substitution to cure ethylene-vinyl acetate-glycidyl methacrylate rubber (EVM-GMA) due to the characteristics of low cost and environmental friendliness. Our previous study found amino silane grafted onto EVM-GMA with low degree due to the low epoxy group content in rubber matrix. Consequently, the moisture crosslinking density of rubber compound is low. So, it is necessary to find an effective method to improve the moisture crosslinking density of EVM-GMA. In this paper, EVM-GMA grafted with γ-aminopropyltriethoxysilane and maleic anhydride (EVM-GMA-g-APTES/MAH) composites were prepared by melt blending, and then the moisture crosslinking of composites was achieved in a 90°C water bath with the aid of catalyst dibutyltin dilaurate (DBTL). The grafting of MAH onto the EVM-GMA molecular chain and its reaction with amino silane were confirmed by differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FT-IR). Furthermore, the moisture crosslinking density of the samples before and after grafting MAH was compared. The results indicated that the moisture crosslinking density of the grafted MAH was higher than that of the unmodified rubber, thus achieving better overall mechanical properties. Therefore, grafting MAH was a feasible way to improve the moisture crosslinking density of EVM-GMA with the existence of silane.
研究领域:
材料科学
·
高分子化学
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高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Yupeng Lv,Yecheng Xu,Wenmin Yang,Changjiang Sun,Guiying Li,Zhen Fang,Zhuhui Qiao
The popularity of conductive hydrogels in flexible sensor research stems from their excellent strain responsiveness and efficient conduction capability. In this study, maleic anhydride (MA)-modified soy protein isolate (MSPI) crosslinked with acrylamide (AM) to form a hydrogel with a tensile strength of 225 kPa at an MSPI content of 16 %. Furthermore, the incorporation of 15 % of lithium chloride (LiCl) significantly enhanced the electrical conductivity of the hydrogel (namely MSPI 0.16 Li 0.15 ), mechanical strength (tensile stress ∼ 238 kPa with a fracture strain of 241 %) and swelling resistance. MSPI 0.16 Li 0.15 presented a high conductivity of 2.8 S/m, surpassing that of a plethora of bio-based hydrogels. Additionally, MSPI 0.16 Li 0.15 was successfully employed to monitor the movement of fingers, elbows, knees and other joints, and can successfully maintain strain sensing under different pH conditions (pH 1, 3, 5, 9, 11 and 13) and organic solvents. It demonstrated distinct electrical responses to various strains, making it suitable for sensing human motion. This work contributes to the development of hydrogels with enhanced electrical conductivity and mechanical properties, promising applications in the field of flexible sensors.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
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高影响因子
GREEN CHEMISTRY
·
2014
·Vol. 16
·期 9
·4351-4358
·
IF 6.852
Jihong Lan,Zhuqi Chen,Jinchi Lin,Guochuan Yin
Catalytic transformation of biomass-based furfural to value-added chemicals is an alternative route to the on-going fossil feedstock-based processes. This work describes catalytic aerobic oxidation of furfural to maleic anhydride, an important polymer starting material having a large market with H5PV2Mo10O40 and Cu(CF3SO3)2 catalysts. Under the optimized conditions, 54.0% yield of maleic anhydride can be achieved with about 7.5% yield of 5-acetoxyl-2(5H)-furanone formation. Notably, 5-acetoxyl-2(5H)-furanone is a highly value-added, biologically important intermediate that has been applied in pharmaceutical synthesis. The catalytic mechanism for furfural oxidation to maleic anhydride and 5-acetoxyl-2(5H)-furanone has been investigated in detail with identification of several key intermediates.
研究领域:
化学工程
·
催化科学
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高影响因子
危险品化学品经营许可证（带存储）