INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2021
·
IF 5.816
Qian Liu,Zhe Wang,Aijun Yu,Jinsheng Li,Hongcheng Shen,Hui Wang,Kai Yang,Hongyu Zhang
We report a novel comb-shaped anion exchange membrane based on poly (2,6-dimethyl-1,4-phenylene oxide) (PPO) and 4-(dimethylamino)butyraldehyde diethyl acetal (DABDA). The Menshutkin reaction successfully introduced DABDA into the brominated PPO backbone, which was proved through FT-IR and 1 H NMR. The distinct hydrophilic/hydrophobic microphase separation structure observed by transmission electron microscope (TEM). As the increase of grafting degree, so does the water uptake, swelling ratio, hydroxide conductivity and alkaline stability. The membranes also possess good mechanical property with tensile strength from 14.2 to 38.11 MPa. This is due to the increasing number of hydroxide and unique steric hindrance effect caused the higher water uptake and higher dimensional stability. Simultaneously, especially PPO/DABDA-60 in comb-shaped membranes demonstrate an excellent long-term alkali resistance stability. In a 576-h alkali resistance stability test, the retained ionic conductivity of the PPO/DABDA-60 membrane is 96% of the initial value. The PPO/DABDA-60 is a potential candidate material for AEM.
研究领域:
材料科学
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化学工程
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电化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Qiuhua Xie,Zhihua Zhang,Na Li,Li Cui,Ping Wang,Yuanyuan Yu,Qiang Wang
In this study, transglutaminase-mediated alkylation modification of zein with octadecylamine (OA) was carried out to enhance the hydrophobicity of zein and the potential application of modified zein in the functionalization of textiles was evaluated. The reaction between OA and zein was demonstrated from the results of sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE), Fourier transform infrared (FTIR) and 1 H nuclear magnetic resonance ( 1 H MIR). The hydrophobicity of zein significantly increased and the secondary structure of zein slightly changed after alkylation modification. The alkylated zein imparted excellent hydrophobic function to cotton textiles with a water contact angle (WCA) value of 131.7° and the hydrophobicity was long-lasting. Scanning electron microscope (SEM) showed a coarse surface formed on cotton fabric due to the participation of OA. The hydrophobic functionalization of the cotton fabric with alkylated zein did not cause negative impact on the mechanical properties and air permeability of the fabric.
研究领域:
材料科学
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纺织工程
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化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 45
·期 1
·123-130
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IF 3.288
Wei Gao,Pingping Jiang,Qian Gu,Hong Zhang,Pingbo Zhang,Agus Haryono
A novel green plasticizer, acetylated lactic acid 1,6-hexane diester (ALHD), was successfully synthesized based on L-lactic acid, a renewable organic acid from corn starch. Its chemical structure was characterized using FTIR, 1H NMR and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS). The plasticizing effects of ALHD as an alternative substitute for commercial plasticizer acetyl tributyl citrate (ATBC) in poly(vinyl chloride) (PVC) were investigated in detail. The results show that the PVC films plasticized using ALHD have better organic solvent resistance and food mimic migration stability than ATBC. After 24 hours of extraction in cyclohexane and petroleum ether, the weight loss of PVC sample S5 plasticized using pure ALHD was reduced by 83.6% and 77.5%, respectively, compared to that of PVC sample S1 plasticized with pure ATBC. Furthermore, after 72 hours of migration in activated carbon, the weight loss of PVC sample S5 decreased by 44.0% compared to that of PVC sample S1, which indicated that ALHD had excellent volatility and migration stability. The elongation at break of the PVC pieces increased from 644.65% to 802.15% as the content of ALHD improved, showing an increase of 24.4%. The mechanical property analysis showed that, with the replacement of ALHD in the place of ATBC, the PVC blends exhibited better flexibility and elasticity.
研究领域:
材料科学
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化学
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环境科学
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高分子科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
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2016
·Vol. 133
·期 34
·
IF 1.866
Tao Wu,Xiulan Xin,Hongqin Liu,Baocai Xu,Xiaoyan Yu
The free-radical polymerization of alkenyl-terminated polyurethane dispersions with styrene and n -butyl acrylate was performed to obtain a series of stable polyurethane–poly( n -butyl acrylate- co -styrene) (PUA) hybrid emulsions. The core–shell structure of the emulsions was observed by transmission electron microscopy, and the microstructure was studied by 1 H-NMR and Fourier transform infrared spectroscopy. The effects of the poly(propylene glycol)s (number-average molecular weights = 1000, 1500, and 2000 Da) and the mass ratios of polyurethane to poly( n -butyl acrylate- co -styrene) (PBS; 50/50, 40/60, 30/70, 20/80, and 10/90) on the structure, morphology, and properties of the PUAs were investigated. The average particle size and water absorption values of the PUAs increased with increasing of PBS content. However, the surface tension decreased from 34.61 to 30.29 mN/m. PUA-2, with a bimodal distribution, showed Newtonian liquid behaviors, and PUA-3 showed a great thermal stability, fast drying characteristics, and excellent adhesion to packaging films. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43763.
研究领域:
高分子科学
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材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Tongyu Wang,Wanli Kang,Hongbin Yang,Zhe Li,Haiming Fan,Wangang Zheng,Tongyu Zhu,Saule Aidarova,Maratbek Gabdullin
The “graft onto” method is used to obtain the “stimuli-responsive water-soluble polymer” with low concentration, where 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride and n-hydroxysulfosuccinimide sodium salt as catalyst and sodium polyacrylate as backbone chain. The molecular structure of the polymer is characterized by Nuclear Magnetic Resonance ( 1 H NMR). The influence of temperature on polymer rheological properties and aggregation is studied by rheometer and fluorescence probe respectively. The results show that when the polymer concentration is higher than 1500 mg/L, the thickening properties can be controlled by diacetoneacrylamide, thermal-responsive monomer , NaCl and polymer concentration, where the apparent viscosity max / viscosity min (η max /η min ) changes from 18.3 to 39.4, from 2.6 to 45.5, from 9.3 to 36, from 7.8 to 36.9 respectively and the lower critical solution temperature (LCST) changes from 60 °C to 40 °C. The reason for the polymer with controllable thickening properties is that the thermal-responsive monomers change from hydrophilicity to hydrophobicity , thus forming aggregations. At this time, the polymer chains form network structures. Because of controllable thickening properties at low concentration, it has potential application prospects.
研究领域:
高分子科学
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2014
·Vol. 49
·期 14
·5141-5150
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IF 2.305
Zhuo Longhai,Kou Kaichang,Wang Yiqun,Yao Pan,Wu Guanglei
We report the design and synthesis of a novel pyridine-containing triamine monomer, 2,6-bis(4-aminophenyl)-4-(4-aminophenoxy)pyridine (BAAP), through combining the nucleophilic aromatic substitution with modified Chichibabin reaction and hydrazine hydrate reduction. Based on it, a novel three-step route was applied in order to obtain a series of new polyimides, containing phthalimide as pendent group and pyridine moieties in main chains. The three-step route consisted of terminating the triamine by incorporating phthalic amic acid as pendant, ring-opening polymerization to form poly(amic acid)s and further chemical imidization to acquire polyimides. Nuclear Magnetic Resonance Spectroscopy ( 1 H-NMR) was used for chemical structural characterization, and the results indicated the various forms of BAAP and branched structure units in the obtained polyimides. The morphology structures of the polyimides were evaluated by X-ray diffraction patterns, and the d -spacing values were found in the range of 4.14–4.65 Ǻ. Most of the resulting polyimides were soluble in polar aprotic solvents, such as NMP, DMF, DMAc, DMSO, and so on. Meanwhile, the polyimides exhibited excellent thermal stability, with the decomposition temperature at 5 and 10 % weight loss temperatures in the ranges of 399.1–461.1 °C and 481.1–566.9 °C, respectively. The polyimides, based on 6FDA, possessed the best comprehensive thermally stable and soluble performance.
研究领域:
高分子化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2015
·Vol. 18
·期 6
·1738-1750
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IF 8.02
Jiliang Ma,Linxin Zhong,Xinwen Peng,Runcang Sun
A simple and effective synthesis of 3,4-dihydropyrimidin-2(1H)-ones/thiones and their derivatives from aldehydes, β-dicarbonyl compounds and urea or thiourea using D-xylonic acid both as a green solvent and an effective catalyst is described. Taking the environment and economy into account, the work presented here has the merits of environmental friendliness, easy operation, simple work-up, excellent yields and the avoidance of organic solvents and inexpensive catalysts. In addition, the good properties of D-xylonic acid have also been validated by the synthesis of 5-phenyl-1(4-methoxyphenyl)-3[(4-methoxyphenyl)-amino]-1H-pyrrol-2(5H)-one and 12-phenyl-9,9-dimethyl-8,9,10,12-tetrahydrobenzo[a]xanthen-11-one. The synthesized compounds were characterized by FT-IR, 1H NMR, 13C NMR and melting point.
研究领域:
有机化学
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绿色化学
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催化
·
合成
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2022
·
IF 7.34
Zongying Zhang,Qinze Liu,Tingting Gao,Congde Qiao,Jinshui Yao,Changbin Zhang
Alkaline lignin, a by-product of the paper-pulping process, can undergo phenolation by pyrogallol in the presence of acetone and sulfuric acid to prepare phenolated-alkaline-lignin (PAL). PAL can be further reacted with tetraethylenepentamine (TEPA) to prepare lignin-based catecholamine (PAL-TEPA), which exhibits excellent ability to remove hazardous Cr (VI) from simulated wastewater. In this study, PAL and PAL-TEPA were systematically investigated by SEM, FT-IR, 1 H NMR, TGA, and XPS. The conditions for the preparation of PAL and the various variables affecting the adsorption behavior of PAL-TEPA were optimized sequentially. The adsorption process followed the pseudo-second-order model and fitted to the Langmuir isotherm equation. The maximum adsorption amount reached 600 mg g −1 ( R = 75 %) under optimized conditions (pH = 2.0, C 0 = 200 mg L −1 , V = 100 mL, T = 30 °C, dos. = 25 mg, t = 24 h). Toxic Cr (VI) ions were successfully converted to harmless Cr (III) ions and removed by PAL-TEPA adsorbent. This approach opens new avenues for the utilization of lignin and new kinds of adsorbent for Cr (VI) removal.
研究领域:
环境科学
·
化学工程
·
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）