ZEITSCHRIFT FUR KRISTALLOGRAPHIE-NEW CRYSTAL STRUCTURES
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2024
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IF 0.3
Kai-Long Zhong,Yue Zhou,Tian-Yu Zhang,Chao-Bo Yang
C 14 H 10 Br 4 , tetragonal, P 4 3 2 1 2 (no. 96), a = 6.8288(8) Å, c = 31.988(6) Å, V = 1491.7(5) Å 3 , Z = 4, R gt ( F ) = 0.0540, w R ref ( F 2 ) = 0.1479, T = 193 K.
研究领域:
化学
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晶体学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
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2020
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IF 2.463
Meiyu Xu,Guangming Liang,Shuang Wang,Xueli Ma,Guangyuan Liang,Qingling Ni
The semi-rigid polycarboxylic acid, 4′,4′,4′-[(trimethylamino)]-tris[(1,1′-biphenyl)-2-car- boxylic acid] (H 3 TMCA), is first synthesized and used to self-assembly three cadmium coordination polymers , formulated as {[Cd(HTMCA)]•(H 2 O)•(DMA)} n (1), {[Cd(HTMCA)(H 2 O)]·(H 2 O) 5 } n (2), {[Cd(TMCA)] - (CH 3 CH 3 NH 2 ) + •H 2 O} n (3) by the reaction of Cd(NO 3 ) 2 ·4H 2 O under solvothermal conditions. The coordination polymers have been characterized by elemental analysis , IR spectroscopy , thermogravimetric analysis and single-crystal X-ray diffraction. Complex 1 is a 2D framework with a point symbol of {6˄3}. Complex 2 exhibit a 3D topology net with point symbol of {10˄3}. Complex 3 display a (3,6)-connected 3D topology net with point symbol of {4.6 2 } 2 {4 2 .6 10 .8 3 }. The structural comparison of complexes 1–3 shows that the final frameworks can be adjusted by changes in the reaction of temperature and solvents. Moreover, the solid-state photoluminescence properties of 1 – 3 have also been investigated.
研究领域:
化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
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IF 7.183
Kaifeng Gu,Sichen Pang,BinBin Yang,Yanli Ji,Yong Zhou,Congjie Gao
The metal ions separation in acid wastewater is of great significance. Nanofiltration (NF) is an effective method to solve this problem. In this work, an acid-resistant PEI/BCMP NF membrane was obtained by chemically crosslinking polyethyleneimine (PEI) and 4,4′-Bis(chloromethyl)-1,1′-biphenyl (BCMP) on the polyethersulfone ultrafiltration (PESU) membrane. Concentration and heat treatment conditions for the membrane preparation were analyzed in detail. The PEI/BCMP membrane formed with 0.6% (m/v) PEI and 0.02% (m/v) BCMP at 80 °C for 10 min exhibited excellent performance. The membrane prepared in the state could be applied in acidic metal salt solutions. The Donnan effect caused the high selectivity for metal cations. At the same time, the loose structure improved the permeability. In the acidic (HCl) solution, the PEI/BCMP membrane showed a strong selectivity for metal ions (FeCl 3 99.5%, CuCl 2 92.2%, ZnCl 2 91.3%). After a long time operation, the membrane performance is still stable.
研究领域:
环境科学
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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
HIGH PERFORMANCE POLYMERS
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2023
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IF 2.1
Jinshui Lu,Jinyuan Zhang,Heng Liu,Weipeng Chen,Jiangrong Luo,Ziqing Wang,Tingting Cui,Yonggang Min,Yidong Liu
In this work, a new diamine was designed by connecting flexible structures such as ether bond and aliphatic carbon chain between benzene rings, and was synthesized and purified through simple reactions such as Suzuki reaction. Finally, a series of polyimide (PI) films were synthesized by copolymerization with 4.4`-diaminodiphenyl ether (ODA)\pyromellitic dianhydride (PMDA) in different proportions. We prepared polyimide films with new monomer copolymerization ratios of 1% (PI-1), 5% (PI-2), 10% (PI-3), and 20% (PI-4). The polyimide films showed excellent glass transition temperatures, which were attributed to their unique bent architectures. The mechanical and thermal properties of the thermosets were studied using tensile testing, static thermomechanical analysis (TMA), and thermogravimetric analysis (TGA). As the results, the films exhibited the optimal glass transition temperatures (317.56°C–381.91°C), and the component with the highest copolymerization ratio has a 15% decrease in glass transition temperature compared to the component without copolymerization. Moreover, PI-1-PI-4 showed good heat resistance in the N2 atmosphere. The temperatures corresponding to a 5% heat loss in the films (T5%) were 458.12 °C–548.75°C, respectively.
研究领域:
材料科学
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高分子化学
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热分析
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DOI
高影响因子
POLYMER
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2020
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IF 4.231
Haoji Lao,Nafeesa Mushtaq,Guofei Chen,Hongyu Jiang,Yang Jiao,Anjiang Zhang,Xingzhong Fang
Two series of optically transparent polyamide-imides (PAIs) were prepared by copolymerization of trimelletic acid chloride (TMAc), p -phthaloyl chloride (TPC), 2,2′-bis(trifluoromethyl)-[1,1′-biphenyl]-4,4′-diamine (TFDB) and 4,4’-(9-fluorenylidene) diamine (FDA). These series of PAIs displayed high glass transition temperatures ( T g s) ranging from 340 to 441 °C, 5% weight loss temperatures ( T 5% s) in nitrogen with 459–505 °C, and low coefficient of thermal expansion (CTE) of 21–56 ppm/K, which greatly affected by the feed ratio of rigid TPC units and cardo diamine in the polymer main chain. The transmittances at 500 nm (T 500nm ) of the PAI films were found in the range of 70.0–87.7%, All polymers demonstrated good organosolubility and mechanical properties with tensile strengths of 77–146 MPa, tensile moduli of 2.9–5.8 GPa and elongations at break of 2.9–8.2%. PAI-7-8 presented the best combination of high T g of 401 °C and high tensile modulus of 5.0 GPa, low CTE value of 24 ppm/K, and high transparency (T 500nm ) of 87.2%.
研究领域:
聚合物科学
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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
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