POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 1
·e6277
·
IF 3.1
Anqi Ming,Xiaoxiao Li,Jun Sun,Yanyan Liu,Xingyou Tian,Hua Wang,Lin Chen,Yuxiang Cao,Yun Yuan
The cationic water-soluble polymers, which are widely used in many areas such as papermaking and separation process, are typically synthesized through polymerization of cationic monomers represented by quaternary ammonium salt. In this work, the polymerization reaction kinetics of three typical quaternary ammonium salt cationic monomers including acryloyl oxygen ethyl trimethyl ammonium chloride (DAC), methyl acryloyl oxygen ethyl trimethyl ammonium chloride (DMC), and methyl acrylamide propyl trimethyl ammonium chloride (MAPTAC) was examined by using the dilatometer method. The results showed that the polymerization rate of all three monomers increased with the increase of initiation temperature, monomer concentration, and initiator concentration. Under the same conditions, the polymerization activity of the three monomers followed the order: DAC > DMC > MAPTAC. The activation energies for the polymerization reaction under the specified conditions were E aDAC = 138.97 kJ/mol, E aDMC = 141.24 kJ/mol, and E aMAPTAC = 226.97 kJ/mol, respectively. The polymerization rate equations were R pDAC = k 1 [ M ] 4.25 [ I ] 0.51 , R pDMC = k 2 [ M ] 3.77 [ I ] 0.50 , and R pMAPTAC = k 3 [ M ] 3.30 [ I ] 0.49 . The polymerization activity of the monomers may be influenced by electronic effects and steric hindrance of the monomer structure. This work has provided a theoretical and experimental foundation for the actual work of structural design and preparation of cationic water-soluble polymers.
研究领域:
高分子化学
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材料科学
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DOI
高影响因子
Biomass Conversion and Biorefinery
·
2023
·
IF 4
Chen Yujiao,Chen Min,Zhang Wuhua,Zhang Shishan,Su Xiankun,Zhao Taijun,Chen Yidan,Su Xiaowei,Zeng Jingwen,Cao Jun,Liu Zhengbo,Zhong Li,Wang Guixue
Nicotiana tabacum leaves are mainly used in the production of cigarettes and cigars all over the world, and a large amount of waste materials will be produced in the process. High-value scopoletin can be extracted and separated from waste materials, but there are some problems, such as low purity of products and inability of large-scale production. In this study, we established an efficient and stable method for producing high-purity scopoletin from waste tobacco by containing acetone reflux extracting with dynamic axial compression-high performance liquid chromatography (DAC-HPLC) separating. In particular, the extraction system makes the scopoletin fully extracted through continuous reflux, the DAC-HPLC system makes the high-purity scopoletin repeatedly obtained, and the DAC-HPLC system was first used for scopoletin. Finally, related to the waste tobacco power, the yield of scopoletin is 1.9%, and its HPLC purity is 99.94%. Additionally, a preparation method for the colorless needle crystal of scopoletin was established. Meanwhile, it has a strong antioxidant activity by testing the scavenging activity of the DPPH free radical and the Fe 3+ reducing power. And its spatial structure was identified by an X-ray diffractometer, which laid a good foundation for in-depth study of scopoletin. Graphical Abstract
研究领域:
植物化学
·
药物化学
·
环境科学
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DOI
高影响因子
Journal of Materials Chemistry B
·
2016
·Vol. 4
·期 9
·1733-1739
·
IF 4.872
Jingli Yang,Shuang Liu,Ying Xiao,Guorong Gao,Yuanna Sun,Qingzhong Guo,Jiangyu Wu,Jun Fu
Multi-responsive hydrogels with high strength have great significance for potential applications in smart soft devices. However, it remains a challenge to incorporate multiple responsive moieties with energy dissipation mechanisms. Herein, multi-responsive nanocomposite hydrogels with high compressive strength and toughness were synthesized via in situ copolymerization of N-isopropylacrylamide (NIPAM) and acryloyloxyethyltrimethyl ammonium chloride (DAC) in an aqueous dispersion of exfoliated LAPONITE® RDS with a minute amount of N,N′-methylenebisacrylamide (MBAA) as a crosslinker. The combined use of clay and MBAA is demonstrated to be favorable for the high strength and toughness, and helped in avoiding precipitation of clay nanosheets, which otherwise occurred upon addition of cationic DAC. The effect of the NIPAM/DAC molar ratio, MBAA and clay contents on the properties of the hydrogels has been systematically investigated. Compression tests showed a compressive strength up to 6.2 MPa, with fracture strain higher than 90%. The presence of ionic DAC moieties in the hydrogels rendered a very high swelling ratio up to 40 (g g−1). These hydrogels were responsive to temperature changes due to the presence of NIPAM units, with the transition temperature (Ttrans) dependent on the molar ratio of NIPAM and DAC monomers. The internal electrostatic repulsion of the NIPAM/DAC copolymer network changed upon exposure to solutions with different pH and/or ion strength. Cyclic swelling–shrinking was demonstrated by shuttling the gels between pure water and 0.1 mol L−1 NaCl solution.
研究领域:
材料科学
·
高分子化学
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DOI
PubMed
高影响因子
Science of Advanced Materials
·
2019
·Vol. 11
·期 6
·842-853
·
IF 1.158
Xu Qiyao,Liu Hongxia,Zheng Huaili,Liang Jianjun
In this study, a new cationic polyacrylamide (CPAM) was successfully synthesized through UV-H2O2-initiated polymerization technique using acryloyloxyethyl trimethyl ammonium chloride (DAC) and acrylamide (AM) as monomers, and applied to sludge dewatering experiments.
Parameters affecting the molecular weight and conversion of the polymers, including total monomer concentration, monomer concentration of DAC, H2O2 concentration, pH and illumination time were examined. Fourier transform infrared spectroscopy (FT-IR), 1H nuclear
magnetic resonance spectroscopy (1H NMR), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) were employed to characterize the properties of the polymers. The results showed that CPAM was successfully synthesized and possessed a coarse and porous surface morphology
and inferior thermal stabilities. When the dosage of polymer was 40 mg L–1 and the initial sludge pH value was 7.0, PAD-3 (cationic degree: 40%, molecular weight: 6.89 × 106 Da) showed a more excellent sludge dewatering performance (FCMC: 70.6% SRF: 2.8 ×
1012 m · kg –1; d
50: 436.802 μm, Df
: 1.59). During the sludge flocculation process, three mechanisms containing charge neutralization, patching and bridging co-contributed to a prominent flocculation performance.
研究领域:
环境科学
·
高分子化学
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DOI
高影响因子
Food Analytical Methods
·
2022
·Vol. 16
·期 1
·55-62
·
IF 3.498
Li Jiale,Li Haoyang,Pei Shizeng,Kang Na,Zhang Guomei,Zhang Caihong,Shuang Shaomin
In this work, a new dye (DAC-CPO) with typical donor-π-acceptor (D-π-A) structure was designed, which could enter the IB subdomain of human serum albumin (HSA) and form the host–guest supramolecular system. Formation of the HSA/DAC-CPO complex was confirmed by the competitive displacement experiments and the molecular-docking study. DAC-CPO alone had no response to sulfur dioxide (SO 2 ), while the HSA/DAC-CPO complex displayed an obvious increased fluorescence response and remarkable blue-shifted emission to SO 2 . The sensitive detection method of SO 2 in aqueous solution was developed with the linear range of 0.5 ~ 4.0 μM. Spectrum data of polarity and viscosity showed that formation of the complex hindered the internal charge-transfer (ICT) process and restricted the rotation of the dye, resulting in the speed increase of reaction between the dye and SO 2 . In addition, the HSA/DAC-CPO complex had also been successfully used for rapid detection of SO 2 in actual samples.
研究领域:
生物化学
·
分析化学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Shiyu Dong,Guohua Wang,Guoqiang Lu,Keqiang Wang,Ruifen Tang,Jun Nie,Xiaoqun Zhu
Hydrogels exhibiting lower or upper critical solution temperature (LCST/UCST) behavior undergo reversible phase transitions accompanied by volumetric shrinkage or optical switching, are widely used in smart windows, anti-counterfeiting, temperature-sensitive robots, and other fields. Nevertheless, their application is restricted by single-step thermal transitions inherent to isotropic polymer networks, which makes it impossible to accomplish several temperature transitions of hydrogels. Furthermore, compared to single-stimulus response, multiple responses present additional difficulties. To address these challenges, adjustable anisotropic Poly (hydroxypropyl acrylate-co-acryloyloxyethyl trimethyl ammonium chloride)/Poly ( N -isopropyl acrylamide) (HD/NIPAM) hydrogels are prepared by limited domain swelling method. These hydrogels achieve tunable transition temperatures (−1.07°C–36.04°C) and broad transition windows (9.4°C–25.3°C) by modulating NIPAM concentration and limited thickness. Remarkably, 1 HD 20 /N 15 hydrogels exhibit exceptional time and cycle stability during their reversible transparency shift (97% to 1.8%). This performance enables applications in gradient-selective smart windows and soft thermal indicators with spatially resolved signaling. Furthermore, through the transition of matrix hydrogel (poly(hydroxypropyl acrylate-co-acryloyloxyethyl trimethyl ammonium chloride) (HD) hydrogel to poly(hydroxypropyl acrylate-co-acryloxyethyl trimethyl ammonium dysprosium thiocyanate) (HDy) hydrogel), the transition from thermal single stimulus to thermal/light dual stimulus response was achieved due to the Dy element.
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高影响因子
Gas Science and Engineering
·
2024
·
IF 0
Yiran Zhang,Shu Zhao,Linjia Li,Jiaqi Feng,Wei Qiu,Zhidong Wei,Xinling Li,Zhen Huang,He Lin
Direct air capture (DAC) technology is a potential carbon negative process, which can effectively reduce the emission of carbon dioxide (CO 2 ) in the atmosphere. Amine-functionalized porous materials are promising because of their high ratio of accessible amino groups and fast adsorption/desorption kinetics. This work reveals the correlation between the specific surface area, pore radius, and pore volume of the silica-based DAC adsorbents and their CO 2 adsorption capacity and adsorption rate. Four typical silica-based DAC adsorbent materials loaded with polyethylenimine (PEI) were studied, including hydrophilic fumed silica (HFS), Santa Barbara Amorphous-15 (SBA-15), Mobil Crystalline Materials-41 (MCM-41), and silica gel (SG). It is observed that when the PEI loading is constant, adsorbent materials with larger specific surface area, larger pore radius, and larger pore volume tend to show the higher adsorption capacity and faster adsorption-desorption rate. Humidity is beneficial for the CO 2 capture capacity, but it slows down the CO 2 uptake rate at the same time. The capacity of 50%PEI@SBA-15 adsorbent can reach to 3.24 mmol/g under 90% relative humidity (RH). Supports with small pore radius tend to have unfavorable performance at dry conditions. After the inlet gas is humidified, the CO 2 capacity of the MCM-41 material is enhanced greatly, from 0.91 mmol/g to 2.92 mmol/g. This work provides guiding principle for synthesizing appropriate adsorbents with higher DAC capacity, higher adsorption and desorption rate at ambient conditions.
研究领域:
材料科学
·
环境科学
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DOI
Polymers
·
2019
·Vol. 11
·期 12
·
IF 3.164
Tingting Chen,Xingqin Fu,Luzi Zhang,Yuejun Zhang
The poly(acryloyloxyethyl trimethyl ammonium chloride–co–acrylamide), P(DAC-AM), is a kind of cationic polyelectrolyte usually applied in a solution form, and its performance is affected by its structure and the environment where it is used. In particular, its viscosity properties in salt solutions are directly related to its efficacy in various applications, and the performance is one of the most important solution properties. Therefore, in this paper, the effects of the salt concentration and valence of seven kinds of inorganic salts, NaCl, LiCl, KCl, MgCl2, AlCl3, Na2SO4, and Na3PO4, on the values of apparent viscosity (ηa) of P(DAC-AM) samples with cationicity of 10%, 50%, and 90%, and intrinsic viscosity ([η]) of 5, 10, and 15 dL/g were investigated. Theηawas determined using a rotational viscometer. The interaction mechanism between the polymers and salt ions was also investigated. The results showed that depending on the salt concentration, theηafirstly decreased sharply to the inflection point which indicated the minimum volume of the molecule shrinking, and then either maintained the value unchanged or increased. The salt concentration corresponding to the inflection point decreased with the increase of the salt ion valence but with the reduction of the cationicity of the polymer. Theηaat the inflection point increased as the [η] of the polymer grew. This indicated that the salt concentration and the salt ion valence had a notable impact on the stretch of the cationic polymer molecule in the salt solutions. It was discovered that the phenomenon of the increase of theηaof P(DAC-AM) samples in the multivalent salt solutions after the inflection point was caused by not only the increase of theηaof the complexes formed from the pure salts, but also the viscosity resistance of the charge and volume between the polymer molecules and salt ions, as well as the complexes themselves. The linear relationship between the increasedηaand the salt concentration, representing the interaction both among the complexes themselves and between the polymer and complexes, was obtained. Furthermore, the interaction model between the salt ions and P(DAC-AM) molecules in a wide range of salt concentrations was illustrated.
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2026
·
IF 5.8
Longying Zhao,Jiayu Chen,Donglin Xiang,Mierban Dawuti,Laping He,Yuangen Wu,Han Tao
Residual organophosphorus pesticides (OPs) in food pose a severe threat to public health, necessitating simple and sensitive on-site analytical methods. In this study, a signal-off electrochemical sensing platform for OPs was constructed based on the OP-induced inhibition of silver deposition triggered by red kidney bean esterase (RKBE), coupled with the signal amplification of a CuNi dual-atom catalyst (CuNi-DAC). RKBE catalyzes the hydrolysis of α-naphthyl acetate to produce α-naphthol, which reduces Ag⁺ to Ag 0 deposited on the electrode. The electroactive Ag 0 undergoes oxidation to generate a prominent oxidation current, providing a sensitive sensing signal for detection. CuNi-DAC modification of the electrode accelerates charge transfer, provides more active sites, and effectively amplifies the sensing signal. Upon exposure to OPs, the activity of RKBE is inhibited, thereby suppressing the production of α-naphthol. This leads to a diminished Ag 0 generation and subsequent a weakened oxidation current. The decrease degree of current signal shows a positive correlation with pesticide concentration. Under optimized conditions, the fabricated sensing platform exhibits a good linear response range of 10 pmol/L-1000 pmol/L for fenthion with a low detection limit of 5.4 pmol/L. Spiked recoveries in cabbage and apple samples ranged from 93.3% to 108.5%, validating the sensing platform's practicality and reliability. This work offers a facile and cost-effective electrochemical sensing approach for on-site screening of OPs.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2026
·
IF 12.2
Jie Fang,Huajun Zhao,Rujie Wang,Lei Xing,Qiangwei Li,Shanlong An,Lidong Wang
Liquid absorption represents a technologically mature and immediately scalable approach for direct air capture (DAC), demonstrating a validated effectiveness in atmospheric CO2 removal. However, its practical deployment is hindered by the high energy consumption and cyclic stability. The core advantage of the biphasic solvent system is the low-energy regeneration of CO2 through liquid–solid phase transition, but its application in DAC faces bottlenecks due to environmental humidity sensitivity and susceptibility to oxidative degradation. In this work, we developed a stable nanoparticle-coupled biphasic ionic liquid system ([AEP][1,2-DMI]-DMSO-H2O/MgO) for DAC, where the introduced nanoparticles significantly enhanced the CO2 transport and phase transition kinetics. Through its unique liquid–solid transition mechanism, 79.5% of captured CO2 was concentrated in a minimal solid phase (15.1% of system mass), while maintaining high loading capacity (total loading: 0.65 mol·mol–1, solid phase loading: 0.30 g·g–1). This system can achieve an ultralow regeneration energy (0.94 GJ·t–1CO2) and exceptional cycling stability (>96.5% efficiency retention over 7 cycles). The nanoparticle-enhanced biphasic ionic liquid system developed in this study has led to a breakthrough in new liquid DAC technology, pushing the technology into a new stage of development by unifying ultralow energy consumption and excellent stability.
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DOI
PubMed
高影响因子
Polymers
·
2024
·Vol. 16
·期 22
·3148
·
IF 4.7
Chunhua Zhao,Xiujun Wang,Jian Zhang,Yigang Liu,Changlong Liu,Bo Huang,Yang Yang
High-internal-phase water-in-oil (W/O) emulsions generated in situ have garnered considerable attention as novel profile control systems. However, conventional emulsifiers are unreactive and poorly dispersed in water, necessitating large dosages and resulting in poor injectivity. In this study, we synthesized amphiphilic nanoparticles (SiO2–NH2–DAC NPs) containing amine and long-chain alkyl groups using a one-pot method and investigated the stabilized emulsion properties. Our results indicated that W/O emulsions with a water-to-oil ratio (WOR) of 7:3 to 8:2 could be prepared with just 0.1 wt% of SiO2–NH2–DAC NPs under neutral and basic conditions, with demulsification occurring under acidic conditions (pH = 2.1), demonstrating the pH-responsiveness of the W/O emulsions. The emulsion viscosity increased from 150 to 2555 mPa·s at different WORs. An additional 18.7% oil recovery was achieved using SiO2–NH2–DAC NPs in a heterogeneous core, highlighting their potential as a promising profile control candidate.
研究领域:
化学工程
·
材料科学
·
石油工程
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 4.3
Mohamed M. Abdel-Halim,Zhongyu Wang,Xuesong Jiang,Jifei Sun,Boyuan Ban,Jian Chen
The quartz mineral was separated from its mixture with the feldspar mineral using a selective flotation method. Trimethyl Tetradecyl Ammonium Chloride (TTAC) was used for the first time as a selective collector for quartz minerals to overcome the challenge posed by its similar physical and chemical properties to feldspar minerals. A comparative study was conducted using Dodecyl Amine hydrochloride (DAC) as a traditional collector. Micro-flotation was used to investigate the flotation behavior of each mineral. Flotation parameters, including pH, conditioning time, and collector dosage, were also investigated. In this study, Trimethyl Tetradecyl Ammonium Chloride (TTAC) was developed, which offers multiple efficacies. This reagent has low usage, excellent water solubility, and ultrahigh separation efficiency owing to the simultaneous generation of hydrogen bonds, electrostatic interactions, and steric hindrance. Under weakly alkaline conditions (pH 7), TTAC produced a quartz concentrate with a significantly higher SiO 2 grade (98.45 % compared to 91.86 % with DAC) and lower impurity grades (K 2 O, Na 2 O, and Al 2 O 3 ) than DAC, demonstrating its superior selectivity for floating quartz over feldspar compared to DAC. Well-concentrated feldspar in the sink product was obtained from a binary mixture via reverse flotation using the TTAC collector. FTIR spectroscopy, contact angle and zeta potential measurements, and X-ray photoelectron spectroscopy (XPS) were used to investigate and confirm TTAC’s greater affinity of TTAC for quartz surfaces compared to feldspar. The increased atomic concentrations of C1s and N1s on quartz after TTAC treatment, relative to those on feldspar, further supports this effect. DFT calculations indicate that the difference in TTAC adsorption energy between the quartz and the feldspar surfaces is 1.5 eV (DAC is only 0.2 eV).Therefore, TTAC has significant potential as a highly selective collector for the separation of feldspar from quartz.
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高影响因子
危险品化学品经营许可证（带存储）