ChemistrySelect
·
2025
·Vol. 10
·期 37
·e02789
·
IF 2
Li Zhong,Yuxin Duan,Meiying Wang,Xiao Xu,Minghuan Qian,Xu Jia
The polymers of N , N -diethylacrylamide (DEA) exhibit temperature-dependent sensitivity attributable to the presence of both hydrophilic and hydrophobic groups. However, their lower critical solution temperature (LCST) is only 25 °C, a limitation that restricts their practical applications. Previous studies have shown that the incorporation of cationic monomers for copolymerization can enhance the LCST of polymers. In this study, dimethyldiallylammonium chloride (DMDAAC) and DEA were selected for copolymerization to obtain a series of thermosensitive water-soluble polymers, poly(DMDAAC- co -DEA). Structure and properties were characterized using FT-IR, 1 H NMR, TG-DSC, and surface tension test. Combined with the critical phase transition mechanism, it was determined that the hydrophilicity of the polymer underwent a gradual increase in proportion with the increase of DMDAAC blocks in polymers, and the LCST exhibited an increase of up to 36.8 °C. The relationship between polymer structure and demulsification performance was also explored, as represented by the application of O/W emulsion. The experimental findings demonstrated that all poly(DMDAAC- co -DEA) products exhibited effective demulsification performance. The demulsification rate of the polymers with 30%, 50%, and 70% of DMDAAC could reach 97.03%, 98.20%, and 98.40% respectively, which shows great potential for the petroleum demulsification application. Graphical Water-soluble polymer Poly(DMDAAC- co -DEA) are synthesized using a three-step heating method. A comprehensive investigation is conducted into the relationship between its LCST and copolymerization ratio, resulting in the elucidation of the underlying mechanism. Furthermore, the demulsifying properties of the copolymer are investigated.
研究领域:
高分子化学
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石油化学
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胶体与界面科学
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功能材料
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分离技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
·
2017
·
IF 1.873
Shuanglei Peng,Guancheng Jiang,Xinliang Li,Lili Yang,Fan Liu,Yinbo He
During the process of recirculating drilling fluids, the removal of useless solids, especially submicron particles, in drilling fluids is the most problematic issue in drilling operations. The cost and efficiency of currently used technologies are the two issues that have to be addressed urgently. In this study, the novel flocculant CMC- g -DMDAAC was synthesized by grafting diallyl dimethyl ammonium chloride (DMDAAC) onto carboxymethyl chitosan (CMC). The physicochemical structure of the CMC- g -DMDAAC product was characterized by Fourier-transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance ( 1 H NMR) spectroscopy, and determination of the ζ-potential. A kaolinite suspension, a bentonite suspension, and drilling fluids from an oilfield were selected to evaluate the flocculation performance of CMC- g -DMDAAC by testing the products’ turbidities and particle size distributions. In comparison, the flocculation performances of chitosan, CMC, and commercial hydrolyzed polyacrylamide (HPAM) were also tested under the same conditions. The results showed that CMC- g -DMDAAC exhibited steady flocculation performances for all clay suspensions and drilling fluids at all pH ranges at low dosage. The scavenging capacity of submicron particles in drilling fluids was also excellent for the tested product.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Qianwen Zhu,Yifan Yue,Xiejun Wang,Baohe Wang,Jing Zhu,Jing Ma
In view of the drawbacks of small specific surface area, poor thermal stability, and easy decomposition, CsPAV was modified by the organic ammonium source dimethyl diallyl ammonium chloride (DMDAAC). A series of (DMDAAC)CsPAV/SiO2 catalysts with different (DMDAAC)CsPAV loadings were prepared by an impregnation method. When DMDAAC-modified CsPAV was supported on SiO2, it exhibited a high specific surface area and more active sites. The catalytic performance of (DMDAAC)CsPAV/SiO2 was investigated by methacrolein (MAL) oxidation to methacrylic acid (MAA). The performance of the catalyst was characterized by FT-IR, XRD, TG, NH3-TPD, NMR, and XPS. There was an interaction between SiO2 and (DMDAAC)CsPAV, and the NH4+ crystalline salt was formed in the process of calcination from DMDAAC. The interaction between the formed NH4+ and SiO2 carrier prevented the decomposition of CsPAV. (DMDAAC)CsPAV/SiO2 showed high stability, and the catalytic performance was stable in the long-term evaluation test. Under the optimum conditions, the conversion of MAL was 80.8%, and the selectivity to MAA was 89.1% for 50(DMDAAC)CsPAV/SiO2.
研究领域:
催化化学
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材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 12
·4815-4822
·
IF 3.069
Jin Wang,Mengde Deng,Yahui Xiao,Wentao Hao,Chengfeng Zhu
Polyelectrolytes with good ionic conductivity and dielectric properties have been shown to be superior for supercapacitors and other power storage devices. Here, a cationic polyelectrolyte with blended poly(N-vinylpyrrolidone-co-diallyl dimethyl ammonium chloride) (P(NVP-co-DMDAAC)) copolymer and poly(vinyl alcohol) (PVA) was prepared via the interpenetrating polymer network (IPN) technique. The dielectric properties, ionic conductivity, mechanical properties and the influence of the thicknesses of hydrogel membranes on capacitance properties were studied. The introduction of the cationic DMDAAC monomer and polar PVA increased the integrated performance of the PNVP hydrogel. In comparison with PVA, PNVP, and P(NVP-co-DMDAAC), P(NVP-co-DMDAAC)/PVA IPN hydrogel exhibited higher permittivity of 27.19 at 1 kHz frequency and the maximum ionic conductivity of 3.66 × 10−2 S cm−1 at 10% PVA dosage. The tensile strength increased with the increase in the PVA content. The specific capacitances of P(NVP-co-DMDAAC)/10PVA increased with the decrease in the thickness of the hydrogel membrane and its retention rate was 95% after 1000 cycles.
研究领域:
材料科学
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电化学
·
能源存储
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产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Ruijing Xu,Wenjie Zou,Ting Wang,Jun Huang,Zhijun Zhang,Chengyan Xu
Flocculation has been widely employed in treatment of mineral tailings and water management. In this study, a chitosan- graft -poly(acrylamide-dimethyl diallyl ammonium chloride) (Chi-g-P(AM-DMDAAC)) was synthesized in-house. The adsorption and interaction mechanisms of Chi-g-P(AM-DMDAAC) and an anionic polyacrylamide (APAM) in a two-step flocculation process of kaolinite were explored using settlement tests, zeta potential measurement, quartz crystal micro-balance with dissipation (QCM-D) and atomic force microscopy (AFM) technique. The type of primary flocculant was critical for the two-step flocculation process. The treatment of the kaolinite suspension using 1 mg/L of Chi-g-P(AM-DMDAAC) followed by adding 2 mg/L of APAM displayed more efficient flocculation performance. QCM-D results showed that three dissipative layers were assembled on model kaolinite surface after sequentially injecting 3.5 mg/L of Chi-g-P(AM-DMDAAC), 0.05 wt% kaolinite suspension and 2.5 mg/L of APAM. The above total adsorption amount (Δ f of −64.9 Hz) was much higher than that of using the two flocculants in reverse order (Δ f of −23.1 Hz). This result indicated that the adsorption layer of the positively charged Chi-g-P(AM-DMDAAC) on kaolinite surface provided active adsorption sites for APAM. Further AFM measurement confirmed that the average adhesion between the silicon tip adsorbed Chi-g-P(AM-DMDAAC) and model kaolinite surface in 2.5 mg/L APAM solution increased from 0.25 ± 0.1 nN to 4.2 ± 0.3 nN with the effective interaction range of 700 nm, which was stronger than that measured between a bare silicon tip and silica substrate in single-component-flocculant solutions. The highly efficient two-step flocculation process could be ascribed to the strong electrostatic attraction between the kaolinite and the oppositely charged Chi-g-P(AM-DMDAAC) and APAM. Findings in this study will benefit the development of environmentally friendly flocculant for mineral tailings and water treatment .
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2025
·
IF 7.2
Yimu Qiao,Xue Han,Yijia Ren,Feiyong Chen,Cuizhen Sun,Jin Wang,Zhigang Yang,Linxu Xu,Xue Shen,Rupeng Liu
The extensive use of ibuprofen (IBU) and acetaminophen (APAP) has led to their accumulation in surface water, resulting in combined pollution with natural organic matter (NOM). In this study, a novel modified chitosan-based coagulant (CTS-DMDAAC) was successfully synthesized by adding ceric ammonium nitrate (CAN) to make chitosan (CTS) and dimethyldiallylammonium chloride (DMDAAC) produce free radicals for graft copolymerization. The study investigated the effects of pH, initial NOM concentration, and suspended particulates on the performance of contaminant removal and the characteristics of flocs. Through analysis of the Zeta potential and floc characteristics, the primary flocculation mechanisms were identified as: net capture and sweep, charge neutralization, and bridging effect. CTS-DMDAAC demonstrated effective removal of NOM, particularly humus, but encountered challenges in removing small-molecule pharmaceuticals such as IBU and APAP, with removal rates below 15%. To enhance the removal rate of small organic molecules, powdered activated carbon (PAC) was incorporated into the coagulation system, resulting in increased removal rates of IBU and APAP to 71.44% and 79.9%, respectively. Additionally, PAC improved the bridging capacity during coagulation, resulting in a 1.25-fold increase in the strength factor and a 2.34-fold increase in the recovery factor of the flocs. These findings suggest that the combined use of PAC and CTS-DMDAAC presents a novel approach for treating water bodies contaminated with NOM and pharmaceutical complexes.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2022
·
IF 4.966
Huimin Duan,Jiawei Li,Jianjun Gu,Lin Lu,Dongming Qi
The facile preparation and well-balanced of durable flame-retardant and multi-functional textiles have become the mainstreams in both academic and industrial communities. In this work, simultaneous enhanced durable flame-retardant and antibacterial properties of cotton fibers are prepared by grafting copolymerized with ammonium vinyl phosphonate (AMVP) and vinyl antibacterial monomers (PDMAPS or DMDAAC). Comparting to the two kinds of grafted cotton fabrics (COT/AMVP-PDMAPS and COT/AMVP-DMDAAC), it is found that COT/AMVP-DMDAAC not only displays excellent durable flame retardant , the limiting oxygen index (LOI) value of 33.8% and self-extinguishing during the vertical flammability test, but also exhibits good antibacterial activity against S. aureus and E. coli with antibacterial rates of 99.10% and 82.97%, after 50 standard washing cycles (SWC). The simultaneous enhancement of the durable flame-retardant and antibacterial properties can be attributed to the coordination effect of DMDAAC and AMVP components on grafted chain. The durable flame-retardant performance is originated from the dense carbon layer by phosphate of AMVP in condensed phase and the auxiliary low-energy of chlorine radical of DMDAAC in gas phase; the durable antibacterial property is caused by the ability to destroy bacterial cell wall of quaternary nitrogen in DMDAAC. Besides, the grafted cotton fabric also reached the wearability requirements and had a good application prospect. Based on these advantages, the grafted cotton fabric with well-balanced performance can be used for flame-retardant and multi-functional textiles to avoid fire and bacterial hazards from external environment.
研究领域:
纺织科学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 35
·49016
·
IF 2.52
Guancheng Jiang,Kai Wang,Yinbo He,Lili Yang,Xinliang Li,Yu Deng
To meet the increasing requirement of stabilizing shale under high-temperature situation with the use of water-based drilling fluids (WBDFs), the high-performance shale stabilizer is an urgent need. In this study, an amphoteric copolymer of AM/DMDAAC/NVP (APC) was synthesized by acrylamide (AM), dimethyl diallyl ammonium chloride (DMDAAC), and N -vinylpyrrolidone (NVP) and used as a high temperature-resistant shale stabilizer. The Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy confirmed the successful synthesis of APC. The inhibitive performance of APC was systematically evaluated and compared with three other commonly used shale stabilizers, including the anionic potassium polyacrylamide (KPAM), cationic poly dimethyl diallyl ammonium chloride (PD), and amphoteric polymer FA367. The results demonstrated that APC displayed excellent performance on the linear swelling test, hot-rolling recovery experiment, and shale immersion test. Furthermore, APC combined the advantages of high shale recovery percentages of PD and maintaining shale pellet integrity of KPAM, avoiding the drawbacks of enormous filtration volume of PD and low shale recovery percentages of KPAM. These great properties indicated that APC would be suitable as a shale stabilizer in WBDF to drill high-temperature shale formation.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2026
·
IF 5.4
Ming Zhou,Zhihui Meng,Chenyiting Li,Xiao Guo,Ronghua Yue,Yuxiang Liu,Jianhong Zhou
Polymer microspheres are widely used in petroleum, electronics, biomedicine, and other industrial fields. This article aims to overcome the problems of poor thermal stability and insufficient mechanical strength of conventional polymer microspheres in high-temperature and high-salinity reservoirs. A composite nanosphere with controllable size and excellent temperature and salt resistance was synthesized by introducing modified nano-SiO 2 to construct an organic-inorganic composite system. The composite nanosphere is crucial for the effectiveness of profile control, water plugging, and oil displacement under harsh reservoir conditions. In this study, amphoteric SiO 2 /P(AM-AMPS-DMDAAC) composite microsphere with small size and regular shape were successfully prepared by reverse phase microemulsion polymerization. A mixed solution of acrylamide (AM), 2-acrylamide-2-methylpropanesulfonic acid (AMPS), diallyldimethylammonium chloride (DMDAAC), KH-570 modified nano-SiO 2 , and methylenebisacrylamide (MBA) was used as the aqueous phase, with Span-80 and Tween-80 as composite emulsifiers. The microsphere exhibits excellent comprehensive physicochemical properties, with a controllable median particle size of approximately 30 nm. Its thermal decomposition temperature increases from 201 °C to 241 °C, and has good viscoelasticity and pseudoplastic characteristics. These properties enable it to effectively cope with harsh reservoir conditions such as high temperature and low permeability. Through oil displacement experiments, the microspheres achieved an average plugging rate of 85.9 % in low-permeability cores and increased the oil recovery by 16.79 %. These indicate that the composite microspheres, as an efficient profile control and water plugging agent, have broad application prospects for enhanced oil recovery in low-permeability reservoirs.
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2018
·Vol. 6
·期 5
·54
·
IF 1.279
Lei Chen,Cuiyun Liu,Yongjun Sun,Wenquan Sun,Yanhua Xu,Huaili Zheng
The ampholytic chitosan based flocculant carboxylated chitosan graft-(3-chloro-2-hydroxypropyl) trimethylammonium chloride-dimethyl diallyl ammonium chloride (CPCTS-g-P (CTA-DMDAAC)) was synthesized by photo polymerization using carboxylated chitosan (CPCTS), 3-chloro-2-chloropropyltrimethylammonium chloride (CTA) and dimethyldiallylammonium chloride (DMDAAC) as the cationic co-monomers. The effects of monomer concentration, the ratio of CPCTS and cationic monomers, cationic degree, initiator time, photoinitiator concentration, and pH value on the properties of CPCTS-g-P (CTA-DMDAAC) were studied. Themicrocystis aeruginosathat was cultured in laboratory was used for CPCTS-g-P (CTA-DMDAAC) flocculation tests. The effects of CPCTS-g-P (CTA-DMDAAC) dosage, pH value and G value on flocculation performance were investigated. The maximum removal rate of chlorophyll-a (Chl-a) and chemical oxygen demand (COD) that were obtained by CPCTS-g-P (CTA-DMDAAC) were 98.8% and 96.5% under the conditions of dosage 4 mg/L, pH 7 and G value 200 s−1, respectively. The flocculation experiments showed that chitosan-based flocculant CPCTS-g-P (CTA-DMDAAC) had better flocculation performance than commercially available flocculants cationic polyacrylamide (CPAM), Polyferric Sulfate (PFS), and polymeric aluminium (PAC).Keywords:chitosan-based flocculant;alga removal;graft copolymerization;photopolymerization;flocculation properties
研究领域:
环境科学
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生物技术
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 30
·47813
·
IF 2.188
Yuming Huang,Dingyu Zhang,Wenlong Zheng
In the petroleum industry, high temperature and high pressure (HTHP) would dramatically worsen rheological properties and increase fluid loss volumes of drilling fluids. Synthetic polymer as an indispensable additive has attracted more and more attention recently. In this article, a new copolymer (named AADS) of 2-acrylamide-2-methylpropanesulfonic acid, acrylamide, dimethyl diallyl ammonium chloride, and sodium styrene sulfonate was synthesized through aqueous solution polymerization. The chemical structure of the copolymer was characterized by Fourier transform infrared spectroscopy and nuclear magnetic resonance. Moreover, its thermal stability was simultaneously analyzed using a differential scanning calorimetry. The results showed that the synthetic polymer contained all the designed functional groups, and its structure was consistent to the desired one. Under contamination of sodium chloride, AADS solution maintained relatively high viscosity in high concentration brine, showing a good antisalt capacity. Furthermore, the effect of AADS content and temperature on rheological behavior and fluid loss volume of the water-based drilling fluid (WBDF) containing the synthesized product were investigated according to the American Petroleum Institute standard. Results showed that the rheological and filtration properties of the prepared WBDF were improved with the increase in the AADS concentration before and after the thermal aging test. In addition, in the temperature range of 80–240 °C, a reversible rheological behavior was observed during the heating–cooling process, and the HTHP fluid loss was controlled within 22.5 mL, suggesting that the copolymer AADS was suitable for making WBDF s with high temperature resistance. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47813.
研究领域:
石油工程
·
高分子科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Qiang Liu,Na Xia,Wenjing Wan,Youcheng Gao,Siming Zhu
Novel eco-friendly and green dimethyldiallylammonium chloride (DMDAAC) grafted chitosan/genipin/cellulose hydrogel beads (CCBG-g-PDMDAAC), were fabricated as selective adsorbents for anionic dyes. The physical and chemical structural changes of the prepared hydrogels were evaluated by FTIR, XRD, SEM and TG-DSC analysis. Results showed CCBG-g-PDMDAAC efficiently and selectively adsorb anionic dyes (Reactive Red 195-RR195 and Methyl orange-MO) from mixture of dye solutions. Endowed chitosan-based hydrogels the advantage of acid insolubility and good adsorption. RR195 and MO adsorption process were described better with pseudo-second-order kinetic model and Langmuir isotherm model with a maximum adsorption capacity of 1333.52 and 190.48 mg/g, respectively, indicating that monolayer chemisorption controlled the sorption process. Moreover, the hydrogels exhibited nice reusability and against S. aureus and E. coli . The hydrogels are promising for the potential application in wastewater treatment and antibacterial simultaneously.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
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）