AICHE JOURNAL
·
2023
·Vol. 69
·期 5
·e18023
·
IF 3.7
Qing Sun,Yan Dong,Shuai Wang,Zhanfang Cao,Xin Ma,Hong Zhong
Modified surfactants can regulate their adsorption at the target surface and are essential for various separation applications such as froth flotation. Thioether-containing hydroxamic acid (BTHA) is an excellent oxidized-ore collector with poor dispersibility. Herein, acylamino, which possesses the ability to improve the surfactants' self-assembly and dispersion, was introduced to synthesize N-[6-(hydroxyamino)-6-oxohexyl] benzylthioacetamide (BTAHA); thus, applying it to cassiterite flotation. Surface tension, adsorption capacity, in situ AFM, and surface energy results reveal BTAHA displays strong bubble stability and readily adsorbs onto the mineral's surface, promoting hydrophobic flotation. BTAHA is an effective cassiterite collector and has good separation effects on cassiterite against calcite. It can form Van der Waals forces and five-membered hydroxamate-(O,O)-Sn rings with Sn atoms on cassiterite surfaces via thioether and hydroxamate groups. Meanwhile, the presence of intermolecular hydrogen bond between the amide groups facilitates the self-assembly of the collectors on the cassiterite surface, and has broad industrial application prospects in various separation processes.
研究领域:
矿物加工工程
·
界面化学
✓ 已验证
DOI
高影响因子
Materials
·
2021
·Vol. 14
·期 6
·1402
·
IF 3.623
Yi Zeng,Yiwu Liu,Jinghua Tan,Jie Huang,Junjie Liu,Ao Tang,Chengliang Chen,Hong Chen
In order to meet the increasingly stringent requirements for heat resistance and barrier properties in the packaging and electronic device encapsulation field. A high-barrier polyimide (NAPPI) contains naphthalene ring and amide group was prepared by polymerization of a novel diamine (NAPDA) and pyromellitic dianhydride. The structure and properties of diamine monomers and polymers were characterized. Results show that the NAPPI exhibits superior barrier properties with extremely low water vapor and oxygen transmission rate values of 0.14 g·m−2·day−1and 0.04 cm3·m−2·day−1, respectively. In addition, the NAPPI presents outstanding mechanical properties and thermal stability as well. This article attempts to explore the relationship between NAPPI structure and barrier properties by combining experiment and simulation. Studies on positron annihilation lifetime spectroscopy, Wide angle X-ray diffractograms and molecular dynamics simulations prove that the NAPPI has smaller interplanar spacing and higher chain regularity. In addition, the strong chain rigidity and interchain cohesion of NAPPI due to the presence of the rigid naphthalene ring and a large number of hydrogen bond interactions formed by amide groups result in compact chain packing and smaller free volume, which reduces the solubility and diffusibility of small molecules in the matrix. In general, the simulation results are consistent with the experimental results, which are important for understanding the barrier mechanism of NAPPI.Keywords:polyimide;naphthalene ring;amide group;barrier properties;molecular simulation
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 3
·e53338
·
IF 3.057
Shenglong Shi,Jinsheng Sun,Kaihe Lv,Qingzhi Wen,Yingrui Bai,Jintang Wang,Jiafeng Jin,Jingping Liu,Xianbin Huang,Jian Li
To prepare the thickener of fracturing fluid with temperature resistance, salt resistance and quick dissolution, an emulsion thickener (ASC) was synthesized by acrylamide, acrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, and acryloyl morpholine. The dissolution, salt resistance and drag reduction of ASC, and the viscoelasticity, temperature resistance and shear resistance and gel breaking properties of fracturing fluid formed by ASC and zirconium crosslinker were investigated. The results showed that the sticky time of ASC was less than 60 s and the drag reduction rate was 72.5% in 100,000 mg/L brine, showing that ASC had thickening ability in high salinity brine and satisfied the requirements of continuous fluid preparation on the fracturing process. The viscosity of ASC fracturing fluid was 98 mPa s after shearing at 200°C and 170 s −1 for 150 min when the salinity was 100,000 mg/L. When the ammonium persulfate concentration was 400 mg/L, the viscosity of the broken fluid was 4.0 mPa s. The temperature resistance, salt resistance and shear resistance of ASC emulsion fracturing fluid could be significantly improved by the introduction of acryloyl morpholine, ASC fracturing fluid had the characteristics of high elasticity and low viscosity, which could meet the application requirements under ultra-high temperature reservoirs.
研究领域:
石油工程
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2023
·
IF 10.7
Shuhan Feng,Jianyong Yi,Youchuan Ma,Jinfeng Bi
Gelation of amidated pectin in the acid environment with the absence of calcium has been found, but the mechanism and gel properties are still not fully understood, especially the role of amide groups. In this study, a series of pectins with different degrees of amidation (DA) were prepared by ammonia reaction, and their structural characteristics including neutral sugar contents, molecular weight contribution, and molecular morphology were fully identified. Acid-induced hydrogels with various DA were then obtained to investigate the impact of amino groups on pectin gelation. Results showed that the higher the DA, the faster the gelation process, and the more stable the gel network. Dynamic rheological and pH stability tests confirmed the essential roles of low pH value (<3.5) and high DA (>49.76%) on the amidated pectin gelation without calcium. Hydrogen bonds were identified as the main interaction for the amidated gel mechanism and enabled the thermo-reversible properties of amidated gels. High content of amide groups allowed the formation of a denser gel network structure with greater mechanical strength, stronger thermo-reversibility, and higher pH stability.
研究领域:
食品科学
·
高分子化学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Bo Niu,Chen Zhu,Haiyang Yuan,Wence Xu,Yanqin Liang,Zhaoyang Li,Hui Jiang,Zhenduo Cui,Zhonghui Gao,Shengli Zhu
Aqueous Zn-metal batteries have been considered as a potentially sustainable energy storage device. They often suffer from poor reversibility and cyclability due to metallic Zn dendrites and parasitic reactions. However, the previous perspectives and mechanisms, coupled with their intricate functional groups for dendrite growth, H 2 evolution, and Zn metal corrosion, render the selection criteria of electrolyte additives inherently ambiguous. Herein, it takes amino acids as an example and detailed explored the impact of three typical groups ─NH 2 , ─COOH, and ─CO─NH 2 . It is identified that the primary determinant of amide groups can be used as active sites to refine the Zn 2+ ion solvation structure and promote Zn deposition. At the Zn metal-electrolyte interface, the chemisorption of amide onto the surface of the Zn anode inhibits hydrogen evolution and facilitates planar deposition of Zn. As a result, the Zn||Zn cell with optimal amino acids with amide group shows remarkable cycling durability under a current density of 10 mA cm −2 . When combined with the NH 4 V 4 O 10 cathode, the assembled coin cell retains ≈60% of its capacity after 500 cycles. This amino acids molecule additive, emphasize the role of amide group in fine-tuning Zn 2+ solvation structures and Zn/electrolyte interface electrochemical properties.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·
IF 3.9
Zhaohui Lu,Dongpeng Li,Qian Gu,Guangtao Qian,Dandan Li,Chunhai Chen
Two novel diamines 1-(4-aminophenyl)-1,3,3-trimethyl-2,3-dihydro-1H-indene-5-amine and 4-amino- N -(4-(5-(4-aminobenzamide)-1,3,3-trimethyl-2,3-dihydro-1H-inden-1-yl) phenyl) benzamide containing indene and amide groups were successfully designed and synthesized, and a series of colorless polyimides (CPIs) derived from the two diamines with 1,2,4,5-cyclohexanetetracarboxylic dianhydride in various ratios were copolymerized. The introduction of aliphatic ring structures was conducive to the improvement of optical properties, while the incorporation of amide groups improved thermal and mechanical properties. These CPI films exhibited excellent optical properties ( T 400 > 80%), high heat resistance ( T g > 300 °C) and mechanical properties with the synergistic action of the two groups. Furthermore, the effect of the content of amide groups on the intermolecular interaction of CPIs was systematically analyzed. This study provides a fancy method for the development of heat-resistant colorless materials for optical applications. Graphical
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Guiliang Li,Jianrong Ye,Qile Fang,Fu Liu
Covalent organic frameworks (COFs) materials with designed skeleton structure and controlled pore size are a new class of adsorbent materials for environment remediation. Here, we synthesize two amide-based COFs materials via a polymerization reaction of acyl chloride and amino groups by mechanical ball milling at room temperature for Pb 2+ removal as adsorbents. Two types of diamine monomers are selected to construct COFs with different framework structure and functional groups contents, i.e. COF-TP from aromatic diamine and COF-TE from linear diamine. The as-prepared COFs materials display typical lamellar structure, and the amide groups on COFs skeleton are confirmed to behave as active adsorption sites for Pb 2+ capture via multi-coordination. COF-TE exhibits superior Pb 2+ adsorption capacity to COF-TP, because that less aromatic skeleton and weak π-π stacking of COF-TE facilitate higher internal diffusion of Pb 2+ adsorption. Meanwhile, the higher amide group content on COF-TE leads to its higher saturated adsorption capacity of 185.7 mg/g than COF-TP of 140.0 mg/g. Finally, great recycling stability of Pb 2+ adsorption allows the amide-based COFs materials to be promising adsorbents for heavy metal Pb 2+ removal or recovery.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Xinning Zhang,Paula Jungwon Choi,Noman Khalid Khanzada,Jiawei Sun,Pak Wai Wong,Jiaxin Guo,Li Ling,Di Wu,Am Jang,Alicia Kyoungjin An
This study presents a layer-by-layer interfacial polymerization approach to enhance the chlorine resistance and water permeability of thin-film composite (TFC) polyamide (PA) forward osmosis membranes . The PA film was prepared by self-polymerization using 3,5-Dihydroxybenzoic acid (DHBA) and trimesoyl chloride (TMC) with addition of 4-amino-benzene sulfonamide (4-ABSA), which is a sulfonamide monomer , on a polysulfone (PSF) support layer. The cross-linking structure and surface characterisation of the DHBA-ABSA membrane was studied systematically. FTIR results showed the successful grafting of the sulfonamide group on the membrane surface. Compared with the MPD-TMC membrane, the water flux of three modified membranes—DHBA, ABSA, and DHBA with ABSA—improved by 27.6%, 44.0%, and 67.6%, respectively, and reverse salt flux decreased by 9.9%, 12.3%, and 16.2%, respectively. Furthermore, the chlorine-stability test using 200 ppm NaClO indicated stable long-term performance under different pH values. The stable sulfonamide structure of ABSA with N-H group effectively prevented chlorine from directly attacking the active layer and improve the chlorine-stability of the membrane. In addition, the abundant hydrophilic groups on ABSA and DHBA monomers formed a hydration layer with water molecules on the membrane surface through hydrogen bonding , which enhanced the permeability of the TFC-PA membranes. The findings of this study demonstrate the DHBA-ABSA membrane's wider application potential in water and wastewater treatment processes .
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
E-POLYMERS
·
2019
·Vol. 19
·期 1
·225-234
·
IF 1.491
Yijun Yue,Lan Zheng,Yuqi Wang,Jinqiao Wu,Shanshan Li,Xiaolong Han,Le Wu
This study facilitates the synthesis process of a novel graft copolymer (flocculant) using carboxymethyl cellulose, acrylonitrile and N-vinyl formamide as raw materials. The carboxymethyl cellulose graft polyamidine (CMC-g-PAMD) can be used as new flocculant to replace the traditional polyacrylamide flocculant, which manifested its excellent flocculation and degradation efficiency. A five-membered cyclic copolymer was prepared by the graft copolymerization, and the synthesized flocculants were characterized by EA, TG-DTG, FT-IR, SEM and NMR, confirming the successful synthesis of the desired copolymers. The operation conditions for copolymerization were experimentally investigated, and the results indicated that the optimal initiator dosage, copolymerization temperature, amidinization temperature, acidification time and flocculant dosage were 4 g/L, 50°C, 90°C, 3 h and 60 mg/L, respectively. Compared with the traditional polyacrylamide flocculant, the CMC-g-PAMD presented an outstanding flocculation ability of 96.1% under its optimal operation conditions, which showed an enormous potential in the application of coalmine waste-water treatment. Graphical
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Zizhao Qian,Yanglei Zheng,Qing Li,Lujie Wang,Feiya Fu,Xiangdong Liu
Diphenolic acid (DPA) is a renewable chemical attracting great interest in biobased polymer science. Despite their low toxicity and high recyclability, the undesirable decarboxylation of DPA-based polymers generally leads to poor thermal stability and material failure restricting their practical applications. Here, we demonstrate that the incorporation of amide groups into a benzoxazine molecule can effectively avoid this problem while improving the thermally mechanical performance of the polybenzoxazine resin. We first synthesized a tetra-phenolic compound via a condensation reaction of DPA with hexanediamine through an ammonium salt route and then prepared a tetrafunctional benzoxazine, denominating as DHDA-fa, by a further reaction with furfurylamine and formaldehyde in a polyethylene glycol 200 (PEG-200) medium. The glass transition temperature (Tg) and decomposition temperature (Td5) of the resulting poly(DHDA-fa) were found to be 326 and 384 °C by DMA and TGA, respectively, which outperformed many biobased benzoxazine resins previously reported. Experimental results revealed that the enhanced hydrogen bonding and doubled oxazine functionary are the important contributors for the improved thermal and mechanical performances. This work confirmed a novel way to perfect DPA-based benzoxazine resins resulting in an effective strategy for developing biobased materials with high performance for practical applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Chemical Science
·
2021
·Vol. 12
·期 13
·4779-4788
·
IF 9.825
Yong Yang,Mehmed Z. Ertem,Lele Duan
The [fac-Mn(bpy)(CO)3Br] complex is capable of catalyzing the electrochemical reduction of CO2 to CO with high selectivity, moderate activity and large overpotential. Several attempts have been made to lower the overpotential and to enhance the catalytic activity of this complex by manipulating the second-coordination sphere of manganese and using relatively stronger acids to promote the protonation-first pathway. We report herein that the complex [fac-Mn(bpy-CONHMe)(CO)3(MeCN)]+ ([1-MeCN]+; bpy-CONHMe = N-methyl-(2,2′-bipyridine)-6-carboxamide) as a pre-catalyst could catalyze the electrochemical reduction of CO2 to CO with low overpotential and high activity and selectivity. Combined experimental and computational studies reveal that the amide NH group not only decreases the overpotential of the Mn catalyst by promoting the dimer and protonation-first pathways in the presence of H2O but also enhances the CO2 electroreduction activity by facilitating C–OH bond cleavage, making [1-MeCN]+ an efficient CO2 reduction pre-catalyst at low overpotential.
研究领域:
化学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DESALINATION
·
2017
·
IF 5.527
Lan Yang,Wenzhong Yang,Bin Xu,Xiaoshuang Yin,Yun Chen,Ying Liu,Yan Ji,Ying Huan
A novel environmental friendly and hydrophilic terpolymer with the sulfonic group and ether group was synthesized by maleic anhydride (MA), 2-acrylamido-2-methylpropanesulphonic acid (AMPS) and 3-allyloxy-2-hydroxy-1-propanesulfonate (AHPSE) in free radical polymerization . The structure of MA/AMPS/AHPSE was characterized by the 13 C nuclear magnetic resonance, Fourier transform infrared spectroscopy spectra, Ultraviolet Visible spectrophotometer and gel permeation chromatography . The inhibition performance of CaCO 3 and zinc scales and the dispersion property of ferric oxide were investigated by static scale inhibition methods. The terpolymer had the best inhibition performance when the weight-average molecular weight ( M w ) was 2.41 × 10 4 , namely the ratio of MA/AMPS/AHPSE was 6/2/0.8. With the optimal M w , the inhibition performance of the terpolymer was superior to that of MA/AMPS, AA/AMPS and PAA. The transmittance ratio of ferric oxide solution was 44.9% at 14 mg/L and the inhibition efficiency of zinc scales reached 89.8% at 10 mg/L. The results revealed that the suitable M w and pluralistic functional groups of this typical terpolymer were the main keys for the excellent inhibition performance. The modified CaCO 3 scales in the presence of MA/AMPS/AHPSE were analyzed by X-ray powder diffraction and scanning electron microscope .
研究领域:
化学工程
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）