CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Qin Zhang,Guo-Rui Zhu,Xiang-Xin Xiao,Qing-Song Liu,Min Jiang,De-Ming Guo,Hai-Bo Zhao,Wen-Da Li,Li Chen,Bo-Wen Liu,Yu-Zhong Wang
Constructing micro cross-linking structures into molecular chains has demonstrated the ability to improve basic properties, such as mechanical strength and thermal stability, of thermoplastic polymers. However, this method has limitations when it comes to improving the functionality of polymers. Herein, we reported a multifunctional micro cross-linking network that improves not just mechanical strength but also flame retardancy, dielectric properties, battery performance, antistatic properties, etc . A novel phosphinamide-containing monomer was designed, synthesized, and copolymerized into the polymer chain of polyamide 6, a typical thermoplastic polymer. On the one hand, the micro cross-linking structure was successfully obtained through the amide interchange reaction between the side-chain phosphinamide groups and the main-chain amide groups, leading to a 23.7% improvement of tensile strength and largely maintained tensile toughness. On the other hand, the functional phosphorus groups showed an efficient free-radical-capturing effect during fire, endowing the copolymer with excellent flame retardancy at a low monomer content of 2 mol%. Additionally, the copolymer also possessed great spinnability, melt-crystallization performance, as well as dielectric property, antistatic property, and battery performance, enabling its potential in a wide variety of applications.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2024
·Vol. 59
·期 29
·13709-13723
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IF 3.5
Yan Shiao,Shao Lijing,Shu Liheng,Wang Xiang,Shi Bin,Dong Qiao
Grouting engineering is extensively employed in highway maintenance, tunnel excavation, mining, and other domains. As application scenarios become more complex, the demands for injectivity and toughness of grouting materials escalate. This research presents the fabrication of a dual-network cementitious material through acrylamide (AM) monomers in-situ polymerization and ultra-fine portland cement for grouting. The in-situ polymerization of AM increases the fluidity of cement paste, forms a hydrogel three-dimensional network structure, and significantly reduces the initial setting time from 345 to 35 min at a 5% AM content. The early-stage compressive strength (0–7 days) is inhibited by the in-situ polymerization, the flexural strength is notably increased, with an overall toughness improvement of 174.4% at a 7% AM content. The in-situ polymerization influences the early hydration behavior of ultra-fine portland cement by delaying the hydration induction period and affecting calcium hydroxide content and the bound water in calcium silicate hydrate. The complexation between metal ions (Ca 2+ , Al 3+ ) in ultra-fine portland cement and carboxyl groups in the polymer enhances organic–inorganic interaction. The three-dimensional network structure of the cement hydration products and the polymer will form a dual-network structure, further enhancing the performance of the ultra-fine portland cement. In this research, the potential application of AM in-situ polymerization in the enhancement of ultra-fine portland cement grouting is proposed.
研究领域:
土木工程
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材料科学
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化学工程
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DOI
高影响因子
MACROMOLECULAR RESEARCH
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2022
·Vol. 30
·期 8
·579-586
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IF 2.127
Deng Bo,Luo Xueqin,Jiang Feng,Liu Wei,Gu Jianwei,Liu Chao,Song Yanan
In the petroleum industry, water-soluble polymers can be used as oil displacement agents. However, the use of water-soluble polymers is limited because of poor temperature and salt resistance. To improve temperature and salt resistance, a weakly cationic polymer with large side groups (PAM/AMPS/VI) was prepared by copolymerizing acrylamide (AM) with 2-acrylamido-2-methylpropane sulfonic acid (AMPS) and 1-vinylimidazole (VI). The viscosity of PAM/AMPS/VI water solutions can be increased more than 20 mPa·s compared with PAM/AMPS. In addition, the viscosity of the solution increased continuously after aging at 80 °C, showing good temperature and salt stability. The protonated tertiary amine in the imidazole ring electrostatically interacts with the sulfonic group, increasing the viscosity and salt resistance of the polymer. The five-membered ring of imidazole also enhances the rigidity of the polymer chain and improves the temperature tolerance. As a confirm of the result, a complete spatial network of PAM/AMPS/VI was observed in scanning electron microscopy (SEM) micrographs. Using weak cationic polymers with large side groups can provide a reference for the design of new temperature tolerance and salt resistant polymer.
研究领域:
石油工程
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高分子化学
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DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
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2015
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IF 2.515
Anqiang Zhang,Qiongqiong Liu,Yufeng Lei,Shuanghao Hong,Yaling Lin
Three series of acrylamide monomers/polymers containing quaternary ammonium salts (QASs), i.e., acrylamide QAS monomers (QDs), homopolymers of QDs (PQDs) and copolymers of QDs with acrylate monomer (PQDCs), were synthesized and employed in antimicrobial tests against both bacteria ( Escherichia coli ( E . coli ) and Staphylococcus albus ( S . albus )) and phytopathogenic fungi ( Rhizoctonia solani ( R . solani ) and Fusarium oxysporum f . sp. cubense race 4 ( Foc 4)). The antibacterial activity of the QASs was evaluated by determining the minimum inhibitory concentration (MIC) against E . coli and S . albus by the TTC coloration method, and the antifungal activity was measured by mycelia growth inhibition as well as MIC and the minimum fungicidal concentration (MFC) values. The results indicated that PQD homopolymers and PQDC copolymers showed far better antimicrobial activities than QD monomers . PQDC copolymers by incorporating hydrophobic acrylate units into the main chain of polyacrylamide backbone displayed even better antimicrobial activities, depending on QAS structure and hydrophobic content. Moreover, polymers with benzyl group attached to nitrogen atom showed better inhibitory effect on bacteria and phytopathogenic fungi. The results could assist understanding and development of future design of antimicrobial polymers as potential fungicide agents to control plant disease.
研究领域:
微生物学
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植物病理学
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有机化学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Bo Wu,Shao-Lu Li,Niamat Ullah,Qiyu Duan,Mengfan Wang,Ning Yu,Genghao Gong,Yunxia Hu
Loose nanofiltration (LNF) membranes with high dyes/salts selectivity and superior anti-fouling performance are urgently needed for treating textile wastewater. Herein, we prepared a polyamide (PA) LNF membrane through reaction of monomer 3,5-diaminobenzamide (3,5-DABA) with trimesoyl chloride (TMC). The presence of an electron-withdrawing and hydrophilic formamide substituent group on the 3,5-DABA monomer not only enhanced the membrane surface hydrophilicity, but also significantly influenced the IP film forming reaction process, leading to a looser and smoother separation layer. The optimized 3,5-DABA/TMC membrane exhibited a high water permeance of 24.62 LMH bar −1 and > 99 % retention for anionic dyes such as Eriochrome Black T (EBT), Methyl blue (MB), and Congo red (CR), as well as 97.5 % rejection for Acid Fuchsin (AF). Simultaneously, it also showed super-low (<5 %) rejection for monovalent anionic salts, achieving a superior selectivity (172.8) for CR/NaCl mixtures. Additionally, the membrane showed superior anti-fouling performance due to its negatively charged, hydrophilic, and relatively smooth surface. These results confirm its potential for saline textile wastewater treatment. This study presents a novel monomer candidate to fabricate outstanding LNF membranes.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2018
·Vol. 41
·期 17
·3432-3440
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IF 2.415
Man-Man Wang,Na Li,Lian-Feng Ai,Li Li,Xue-Lei Chen,Ye-Qing Jia,Xue-Sheng Wang
We report the fabrication of an anion-exchange monolithic column in a stainless-steel chromatographic column (10 mm × 2.1 mm i.d.) using [2-(acryloyloxy) ethyl]trimethylammonium chloride as the monomer and ethylene dimethacrylate as the crosslinker. The prepared monolith was developed as the adsorbent for the on-line solid-phase extraction of salicylic acid in various animal-origin foodstuffs combined with liquid chromatography and tandem mass spectrometry. The monolith was characterized by using Fourier transform infrared spectroscopy, scanning electron microscopy, nitrogen adsorption analysis, and elemental analysis. Potential factors affecting the on-line solid-phase extraction and liquid chromatography with tandem mass spectrometry analysis were studied in detail. Under the optimized conditions, the total analysis time including cleanup and liquid chromatography with tandem mass spectrometry separation was 17 min. The developed method gave the linear range of 15–750 μg/kg, detection limits (S/N = 3) of 5 μg/kg, and quantification limits (S/N = 10) of 15 μg/kg. The recoveries obtained by spiking 10, 20, and 100 μg/kg of salicylic acid in the animal-origin food samples were in the range of 85.2–98.4%. In addition, the monolith was stable enough for 550 extraction cycles with the precision of peak area ≤11.6%.
研究领域:
分析化学
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食品安全
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
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2023
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IF 5.9
Zhiwei Chang,Yulin Shen,Junfang Xue,Yi Sun,Shifeng Zhang
Fabricating multifunctional soy protein (SP) adhesives with excellent cold-pressing initial adhesion and hot-pressing cured bonding strength to meet the plywood practical production is challenging. Herein, inspired by the mussel and oyster, a redox self-catalytic and organic-inorganic hybrid dual-bionic strategy was proposed to design redox TA@BN/Ag nanosheets via in-situ deposition of Ag nanoparticles (NPs) on the tannic acid (TA)-encapsulated two-dimensional boron nitride nanosheets (BNNS). The nanosheets activated ammonium persulfate followed by free-radical polymerization of acrylamide monomers in the SP matrix to rapidly fabricate an organic-inorganic hybrid SP gel. Due to the abundance of catechol groups derived from dynamic redox balance, the cold-pressing shear strength of the gel increased by 818.2% to 1.01 MPa. The dry shear strength of the gel increased by 145.4% to 2.38 MPa under the stable organic-inorganic hybrid structure. Meanwhile, the wet shear strength of the gel increased by 247.4% to 1.32 MPa. Additionally, the gel exhibited long-term effective antibacterial properties and more than 60-day mildew resistance due to the introduction of Ag NPs and TA . The gel also showed favorable flame retardance and thermal conductivity after incorporating of TA@BN/Ag nanosheets. This work provides a promising method for the design and application of multifunctional high-performance bio-based adhesives.
研究领域:
材料科学
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化学工程
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生物技术
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纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）