ACS Omega
·
2024
·
IF 3.7
Shulei Shi,Xiao-Han Wang,Bingyou Jiang,Wenhan Tao,Chang-Fei Yu,Ben Ji
The natural material pectin was used as the matrix to prepare a dust suppressant. The regression model in response to the grafting ratio was established, and the optimum modification scheme was determined. The amount of monomer, initiator, cross-linking agent, and reaction temperature was 3.20 g, 0.20 g, and 0.15 g and 92 °C, respectively. Through Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy tests, not only the formation of the product in graft copolymerization reaction was validated but also the wettability of pectin was significantly improved. The surface morphology of pectin before and after modification was observed by a scanning electron microscope. After graft copolymerization treatment, the surface of pectin presented a dense grid structure, which proved that the pectin-modified dust suppressant can play a crucial role in wetting and condensing coal dust. Contact angle tests were used to characterize the effect of pectin modification on the wettability of bituminous coal before and after modification. The results of contact angle tests showed that when the droplets just contacted the bituminous coal flakes, the contact angle of modified pectin droplets on the flakes was the smallest, and the value was 55.21°. Compared with pure water droplets and unmodified pectin droplets, it decreased by 21.66° and 18.50°. The modification reaction process and dust suppression mechanism were explained at the molecular level.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2015
·
IF 4.074
Yuanyuan Yu,Qiang Wang,Jiugang Yuan,Xuerong Fan,Ping Wang,Li Cui
Hydrophobic cotton fabrics were prepared by grafting octadecylamine (ODA) onto cotton fiber surfaces via the laccase/2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO) treatment. The cotton fibers were oxidized by laccase/TEMPO to introduce aldehyde groups, which reacted with the amino groups of ODA to form Schiff base. First, ODA was coupled to glucan, used as a model compound of cellulose. The results of FT-IR and MALDI-TOF mass spectroscopy prove the formation of a Schiff base between ODA and glucan. Moreover, the existence of ODA in the grafted cotton fibers was verified by ATR-FTIR, elemental analysis, X-ray photoelectron spectroscopy. Finally, the hydrophobicity of the ODA-grafted cotton fabrics was estimated. The surface hydrophobicity of the cotton fabrics increased after the enzymatic grafting reaction.
研究领域:
材料科学
·
纺织工程
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2015
·Vol. 132
·期 43
·
IF 1.768
Xiaoqin Chen,Zuliang Liu,Weiwei Cao,Chunyan Yong,Xiaodong Xing
A viable method for coating of cellulose fiber with quaternarized N-halamine is reported in this article. The use of quaternary ammonium salt group in combination with N-halamine group can reinforce the antibacterial activity. The chemical structure of as-synthesized N-halamine precursor 4-(Bromo-acetic acid methylester)-4-ethyl-2- oxazolidinone (BEO) was characterized by 1 H-NMR. The cellulose fibers were characterized by Fourier transform infrared spectra and X-ray photoelectron spectra. The spectra data confirmed that the quaternarized N-halamine-grafted cellulose fibers were successfully obtained. The antibacterial properties of functional fibers were challenged with both Gram positive and Gram negative bacteria. The antibacterial tests and showed that the as-prepared antibacterial cellulose fibers exhibited powerful and rapid bactericidal performance against both Gram negative E. coli and Gram positive S. aureus . © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42702.
研究领域:
材料科学
·
微生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·
IF 2.7
Mingti Wang,Shixun Hu,Wenjia Zhang,Yuxiao Zhou,Shangshi Huang,Jiahui Zhang,Qi Zhang,Changlong Yang,Qi Li,Hao Yuan,Jinliang He
Polypropylene (PP) is believed to be a rather promising cable insulating material for high-capacity electric power system with low carbon emission due to its decent thermo-resistance and recyclable nature. In this paper, a new dually chemical grafting modification strategy by methyl acrylate (MA) and acrylic acid (AA) is put forward to tailor the charge transportation behavior in PP, thus further enhancing the electrical properties. Experimental results indicate that the dually grafted PP with 2.3 weight percent (wt%) MA and 1.9 wt% AA shows enhanced volume resistivity and electrical breakdown strength than pure PP, and the space charge injection is significantly suppressed. This work further adopts thermally stimulated depolarization current (TSDC) test and computational analysis based on density functional theory (DFT) to reveal the mechanism of enhancement. The analysis shows that grafted chemical groups can introduce quantities of deep traps and electrostatic potential wells which are strongly correlated with the carbonyl group and would hinder the charge transportation thus improving the electrical insulating performances of PP. This work would provide a new route of PP-based dually grafting modification for the development of high-voltage cable insulation.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 13
·4908
·
IF 4.6
Yaqing Lu,Yuyao Liu,Yujie Tong,Huili Cheng,Di Yang,Jiandong Ding,Qiyang Guo
Direct current (DC) power transmission systems have received great attention because it can easily integrate many types of renewable energies and have low energy loss in long-distance and large-capacity power transmission for electricity global sharing. Nanoparticles (NPs) have a positive effect on the insulation properties of polymers, but weak interaction between NPs and polymer matrix greatly decreases the effort of NPs on the enhancement of insulation properties, and thereby limits its engineering application. In this work, grafting strategy was used to link the modified NPs and polymer matrix to improve their interactions. Silica NPs (SiO2-NPs) were modified by 3-(methacrylyloxy) propyl-trimethoxysilane (MPS) to introduce highly active groups on the SiO2-NPs surface, followed by the pre-irradiated linear low-density polyethylene (LLDPE) being easily grafted onto the MPS modified SiO2-NPs (MPS-SiO2-NPs) in the melt blending process to obtain LLDPE-g-MPS-SiO2-NPs nanocomposites. Fourier-transform infrared (FT-IR) spectrum and X-ray photoelectron spectroscopy (XPS) confirm the successful incorporation of MPS into SiO2-NPs. Transmission electron microscopy (TEM) verifies that the modified SiO2-NPs exhibits more uniform distribution. The rheology result shows that the interaction between MPS-SiO2-NPs and LLDPE significantly improves. More importantly, the LLDPE-g-MPS-SiO2-NPs nanocomposites displays superior DC breakdown strength to that fabricated by conventional modification methods. When the addition of MPS-SiO2-NPs is 0.1 wt%, the highest DC breakdown strength values of 525 kV/mm and 372 kV/mm are obtained at 30 °C and 70 °C, respectively, and high DC breakdown strength can be well maintained in a wide loading range of NPs.Keywords:LLDPE;nanocomposites;SiO2;grafting onto;DC breakdown strength
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2019
·Vol. 59
·期 5
·1043-1050
·
IF 1.92
Yi-Kai Zhan,Shuai Du,Min He,Dao-Hai Zhang,Yu-Fei Liu,Li-Ping Li
In this study, a carboxy esterification reaction was used to graft the hydrophilic polymers polyethylene glycol (PEG) and polyvinyl alcohol (PVA) onto the surface of carbon fibers (CFs). The properties of the grafted CFs were investigated by scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TG) and through the measurement of interlaminar shear strength (ILSS). SEM enabled the graft morphology on CF surfaces to be determined. In comparisons of grafted and non-grafted CFs, AFM indicated that the roughness was significantly improved; XPS showed that the concentration of oxygen-containing functional groups increased by 186.1%; TG showed that the grafting rate of CF -grafted PEG ( CF -g-PEG) was 0.5%, and that of CF -grafted PVA ( CF -g-PVA) was 2.0%; and the ILSS of CF -g-PEG and CF -g-PVA increased by 22.7% and 43.0%, respectively. We conclude that esterification grafting is an effective method for modifying the physicochemical properties of CFs and improving the interfacial adhesion of composites. POLYM. ENG. SCI., 59:1043–1050, 2019. © 2019 Society of Plastics Engineers
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
·
2023
·Vol. 30
·期 5
·2142-2149
·
IF 3.1
Wenjia Zhang,Shixun Hu,Yaru Zhang,Qi Zhang,Mingti Wang,Juan Li,Xinhua Dong,Xiyu Zhang,Shangshi Huang,Wei Wang,Qi Li,Jinliang He
Polypropylene (PP) is regarded as an environmentally friendly cable insulation material to replace cross-linked polyethylene (XLPE) owing to its thermoplastic nature, high-temperature resistance, and outstanding dielectric characteristics. Grafting modification was applied to satisfy the demand for a higher voltage power grid, and it was proved to be effective in enhancing the insulating performance of PP. The electrical tree is a common cause for cable insulation failure. This study examines the electrical tree initiation and growth characteristics of methyl methacrylate (MMA)-grafted PP under different temperatures. Our results indicate that high temperature can promote the electrical treeing process while grafting modification can hinder the process. The trap characteristics show that more deep traps are introduced in the grafted materials that can limit the motion of electrons and, thus, restrict the electrical tree initiation process. The crystallization morphology shows that the size of spherulites increases and the boundaries of the spherulites become blurry with higher MMA content. The compressed amorphous region and the tortuous boundaries of the crystalline can hinder the electrical treeing process. High temperature may improve charge carrier mobility and enhance the molecular chain relaxation, thus enlarging the free volume and finally accelerating the treeing process. The findings of this study would serve as a reference for designing grafted PP insulation for power cables.
研究领域:
材料科学
·
电气工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Jun Wei,Xinyu Ma,Fengrui Yang,Shuwei Jia,Zhi Wang
Efficient separation of Mg 2+ /Li + is the key to extracting lithium resources from salt lakes. In this work, a symmetrical bis-quaternary ammonium salt (quaternized 1, 4-dimethylpiperazine, QDMPIP) monomer was synthesized and grafted to the surface of a polyamide nanofiltration membrane. By modulating the grafting amount of QDMPIP monomers, the membrane properties—including positive charge density, pore size, and hydrophilicity—were tailored. The surface of optimally QDMPIP-grafted membrane has a strong positive property, which can reduce Mg 2+ /Li + from 50 (feed) to 0.85 (permeate), and the corresponding S Mg2+/Li + reaches 58.5, which is 7.4 times that of the unmodified membrane. Remarkably, the flux remained comparable to the pristine membrane, while achieving a MgCl 2 rejection rate exceeding 93 % at 6000 ppm. In addition, the grafting of QDMPIP also improves the crosslinking degree of the membrane surface, which makes it have stable performance at complex operating pressures. Owing to its exceptional separation efficiency, high stability, and straightforward fabrication process, the QDMPIP-modified membrane demonstrates great industrialization potential in the extraction of lithium resources from salt lakes with a high Mg 2+ /Li + ratio.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2018
·
IF 3.767
Lili Wang,Rumeng Li,Chenglong Wang,Bairan Hao,Jianzhong Shao
A series of reactive TiO 2 pigments with olefinic double-bonds were prepared by grafting modification of silane coupler KH570 to be covalently anchored in the blue-light curing film, which improved the color fastness to crocking of the printed fabrics significantly. Effects of KH570 concentrations on particle size, surface wettability and dispersing stability of KH570-TiO 2 pigments, photo-polymerization of KH570-TiO 2 bule-light curing inks and tensile properties of curing films were investigated. Color fastness to crocking of KH570-TiO 2 pigment on cotton fabric was explored. Results showed that compared to the native TiO 2 , all the properties of KH570-TiO 2 improved. With the increases of KH570 concentrations, the grafting degrees of KH570-TiO 2 had gradual increase. The surface hydrophobicity and dispersion stability of KH570-TiO 2 pigments, photo-polymerization of KH570-TiO 2 blue-light curing ink and tensile properties of curing films enhanced, especially those of 12∼20KH570-TiO 2 the best. Within the concentrations of KH570 12–20 wt %, the printed fabrics had dry/wet color fastness to crocking no less than 4 grades.
研究领域:
材料科学
·
纺织工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2014
·Vol. 55
·期 4
·889-895
·
IF 1.441
Liu Zhang,Haicun Yang,Hui Liu,Qingting Ni,Fanghong Gong
Polystyrene-grafted attapulgite (ATP-g-PS) was prepared using surface-initiated redox initiation via graft from approach. ATP was modified with (3- aminopropyl) triethoxysilane (APTES) to anchor amine on the surface (ATP-NH 2 ), and then ATP-NH 2 was further treated with 4-(diethylamino) salicylaldehyde (DEAS) to give aromatic tertiary amine groups functional ATP (ATP-ATA). Subsequently, the surface-initiated redox polymerization of styrene in the presence of ATP-ATA and benzoyl peroxide (BPO) was performed to afford ATP-g-PS . The chemical grafting of PS on the surface of ATP was confirmed by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis . The crystal structure of PS-grafted ATP was characterized by X-ray diffraction (XRD) analysis. The morphology of ATP-g-PS was observed by scanning electron microscopy (SEM) . POLYM. ENG. SCI., 55:889–895, 2015. © 2014 Society of Plastics Engineers
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
JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 24
·13812-13828
·
IF 2.599
Jiao Weiwei,Liu Wenbo,Yang Fan,Jiang Long,Jiao Weicheng,Wang Rongguo
The poor interfacial adhesion between carbon fibers (CFs) and vinyl ester resin (VE) has seriously hampered the application of CFs/VE composites. In this work, the interfacial adhesion was efficiently enhanced by grafting acrylamide with epoxy sizing agent on CFs surface. The grafting reaction was feasible according to the thermodynamic calculation. The optimal grafting condition was 80 °C for 10 min based on the kinetic investigation by differential scanning calorimeter. Surface morphology and surface composition of modified carbon fibers (MCFs) were characterized, which indicated that acrylamide was grafted successfully on CFs surface and the surface roughness was increased slightly. After grafting, the interface shear strength of MCFs/VE composites was significantly improved by 86.96% and the interlaminar shear strength was enhanced by 55.61% due to the covalent bonds in interphase and the toughening effect of sizing gent. Moreover, the static and dynamic mechanical properties of composites with different interfacial adhesion were measured, which further confirmed the effect of the grafting modification.
研究领域:
材料科学
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2015
·
IF 0
Yang Yi Chen,Qi Zhong,Tao Chen,Ji Ping Wang
The cotton fabrics with enhanced cleaning capability were prepared by grafting thermo-responsive random copolymer poly (2-(2-methoxyethoxy) ethoxyethyl methacrylate-co-acrylic acid), abbreviated as P(MEO2MA-co-AA), to the amino modified cotton fabrics. ATR-FTIR measurement confirmed the immobilization of P(MEO2MA-co-AA) to the cotton fabrics. Equilibrium swelling ratio indicates that the cotton fabric with grafted P(MEO2MA-co-AA) possesses thermo-responsive ability .The enhanced cleaning capability was investigated by the decontamination experiments probed with confocal microscope. The results show the cleaning capability can be prominently improved when the cleaning temperature is lower than the LCST of P(MEO2MA-co-AA).
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
危险品化学品经营许可证（带存储）