Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2013
·
IF 0.807
Jiaojiao Shang,Guo Yao,Shaojian Lin,Jianwu Lan,Xia Huang,Wen He
A series of thermoplastic poly(ester-imide-ether) (PEIE) elastomers, with different ratios of soft/hard segment 85/15, 80/20 and 70/30, were prepared from 1, 4-butanediol (BD), poly(tetramethylene glycol) (PTMG) and imide dicarboxylic acid monomer based on 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and glycine (GLY). The chemical structures of the imide dicarboxylic acid and PEIEs were characterized by FT-IR and 1H-NMR, respectively. The intrinsic viscosities, thermal properties and mechanical properties of these PEIEs were investigated. The results show that introduction of imide group endows the PEIEs with excellent thermal stability, the melting point of PEIEs at about 220°C, and the temperature of 5% weight loss appears at the range of 332–358°C. In addition, the mechanical properties of PEIEs are also improved with the increment of imide units, the maximum stress and strain reached to 17.15 MP and 1043.75%, respectively.
研究领域:
高分子化学
·
材料科学
·
热分析
·
机械工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 9
·4059-4071
·
IF 3.5
Lyu Maoping,Liu Yingchun,Cui Xiaohua,Liang Liyan
Developing cross-linked polymers with both low dielectric constant and degradability for microelectronics and sustainability remains a challenge. Herein, a new fluoro-containing dialdehyde monomer (VF) derived from vanillin was synthesized, which was then cross-linked with a tris (2-aminoethyl) amine (TREN) and different diamines (4, 4 ′ -methylenebis (cyclohexylamine) (PACM), 4, 4 ′ -diaminodiphenylmethane (DDM) and 1, 6-hexamethylenediamine (HMDA)) to give three polyimines thermosets, namely VFT-P, VFT-D and VTF-H, respectively, showing controlled comprehensive properties through regulation of imine cross-linked structures. Properties-function relationship of these polyimines was systematically studied and focused mainly on revealing the degradation process and the mechanism of the degradability of polyimines. The results indicated that among these polyimines, VFT-P exhibited superior conventional properties and acid resistance due to its appropriate reactivity, cross-linked density, rigid non-conjugated Schiff base structures, and high free volume. The storage modulus, glass transition temperature, transmittance, and tensile strength of VFT-P polyimines could reach 3.40 GPa, 134 °C, > 97% (at 500–800 nm) and 62.47 ± 3.65 MPa, respectively. Besides, a low dielectric constant of 2.96 at 100 MHz and superior degradability was achieved. This study introduces a facile and effective design strategy to achieve the compatibility of target properties and also offers a potentially sustainable alternative to conventional cross-linked dielectric polymers. Graphical abstract
研究领域:
高分子科学
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材料工程
·
微电子学
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有机合成
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介电材料
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可持续化学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Zhengzhou Su,Chunmei Li,Jiaojun Tan,Ying Xue,Guoxian Zhang,Yumin Yang,Qiuyu Zhang
Oil-in-oil emulsions are ideal systems for water-sensitive reactions such as polymerizations and catalytic reactions , which has received extensive attention in recent years. The application of oil-in-oil emulsions has been developed slowly due to the limited types of surfactants and complicated synthesis process. Herein, we proposed a simple method to prepare poly(amide-thioether)-based surfactant for oil-in-oil emulsions via taking advantage of single-pot multicomponent and click characters of thiolactone chemistry. Using a combination of alkyl amine and acrylamide thiolactone, the aminolysis of thiolctone occurred first, generating thiol group in-situ, and then the generated thiol group would sequentially react with the double bonds of acrylamide to form polythioether in the presence of amine. The hydrophobicity of the surfactant could be effectively adjusted by the chain length of the alkyl amine and thus this polymer could serve as a promising surfactant for oil-in-oil emulsion. Notably, the emulsion types could be switched by changing the chain length of the alkyl amine. In addition, the effects of surfactant loading, volume ratio of oil phases, oil types on the size and stability of oil-in-oil emulsions were further investigated. It was demonstrated that the oil-in-oil emulsion stabilized by poly(amide-thioether)s kept stable after more than five months. Besides, we preliminarily explored the application of the oil-in-oil emulsion to prepare closed cell foam and porous particles via photo-initiated thiol-ene polymerization. It is believed that this super-stable oil-in-oil emulsion could offer more possibilities for highly potential water-sensitive systems.
研究领域:
高分子化学
·
胶体与界面科学
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材料科学
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化学工程
·
软物质物理
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Chenhan Lv,Haixiang Cheng,Rui Fan,Jingyu Sun,Xinghai Liu,Yinghui Ji
Organic fluorine compounds are acute carcinogenic and mutagenic to humans. Photoelectrocatalysis (PEC) treatment is an innovative technology in the field of the removal of fluorine compounds, and thus current research focused on improving stability and catalytic ability of photoanode. In this study, it has been synthesized a rGO/BiOI photocathode for the efficient degradation of 4-Fluoroaniline (4-FA). The physical characterization and photoelectrochemical properties of the photocathode was determined. The results indicate that the PEC treatment with the rGO/BiOI photocathode was more efficient compared with individual processes. During the optimization experiments, the PEC treatment achieved 99.58 % and 72.12 % of 4-FA degradation and defluorination within 1 h. Cyclic stability experiments show that rGO/BiOI photocathode was efficient and stable, which reached 96.91 % and 67.64 % of 4-FA degradation and defluorination after five cycles. Mechanism analysis indicates that the PEC process was based on an electrochemical reaction and photo-induced processes. The degradation product of 4-FA was mainly 2,4-di-t-butylphenol, and trapping experiments indicates that h + is the primary oxidizing species. Therefore, PEC treatment with rGO/BiOI photocathode is a competitive green approach to remove fluorine compounds pollutants and brings new insights into development of PEC treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Gen Li,Zhonggang Wang
This paper presents a series of micro- and ultramicroporous polyaminals with BET surface areas up to 1304 m2 g–1, which are prepared from two triazine-based tetraamines and three dialdehydes or monoaldehyde through the A4 + B2 or A4 + B1 aminalization reaction. It is interesting to find that the para-substituted monomers are favorable to force the linking struts apart in the network to generate micropores (1.22 nm), whereas the meta-substituted monomers make the pores in the network squeezed by the twisted linking struts, resulting in the formation of ultramicropores (0.52 nm). Besides, the adsorption behaviors of the major components of natural gas, such as propane (C3H8), ethane (C2H6), methane (CH4), and carbon dioxide (CO2), are significantly different, strongly depending on the polarizabilities, critical temperatures, molecular sizes of gases, porosity parameters of polymers, and the interaction between gases and the polymer skeleton. At 298 K/1 bar, the polymers show high uptake for C3H8 (114.5 cm3 g–1) and C2H6 (84.2 cm3 g–1). Moreover, the adsorption selectivities of C3H8/CH4, C2H6/CH4, C3H8/C2H6, C3H8/CO2, C2H6/CO2, and CO2/CH4 also reach 296.3, 23.1, 9.0, 22.1, 4.1, and 5.0, respectively, exhibiting promising applications in adsorption/separation of C1–C3 hydrocarbons and stripping CO2 gas from natural gas under the ambient condition.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2019
·
IF 8.355
Yuwei Pan,Hongjin Guo,Minghua Zhou,Ying Zhang,Yusi Tian,Wei Wang
This study presents a novel pre-magnetized Fe 0 /ethylenediaminetetraacetic acid/air (pre-Fe 0 /EDTA/air) Fenton-like system to remove sulfamethazine (SMT). SMT removal only reached 10.6% in pre-Fe 0 /air system (0.2 g L −1 , SMT 3 mg L −1 , pH 5) while reached 88.5% in pre-Fe 0 /EDTA/air system within 1 h (0.2 g L −1 , SMT 3 mg L −1 , EDTA 2 mM, pH 5). EDTA could combine with Fe II or Fe III to keep iron soluble in the solution and the fast activation of molecular oxygen by Fe-EDTA complex could induce the fast and more production of H 2 O 2 . It was found that much more H 2 O 2 (5.1 mg L −1 ) and OH radical (26.4 μM) were produced in the pre-Fe 0 /EDTA/air system than in the pre-Fe 0 /air system (0.06 mg L −1 , 0.6 μM) within 1 h. The degradation rate of SMT (1 0 3 ) in pre-Fe 0 /EDTA/air system (38.4 min −1 ) was also 2.3 times as large as that in the Fe 0 /EDTA/air system (17.0 min −1 ), owing to the fast corrosion rate of pre-Fe 0 . 81.5 mgL −1 total Fe ions could be generated in pre-Fe 0 /EDTA/air while 53.6 mg L −1 in Fe 0 /EDTA/air. Fe 0 dosage (0.05–0.8 g L −1 ) and EDTA dosage (0–8 mM) were optimized and the optimal dosage for Fe 0 and EDTA was 0.2 g L −1 and 2 mM, respectively. The degradation rate of SMT in pre-Fe 0 /EDTA/air system were 1.6–2.9 times at different initial pH (3–6) and 2.3–3.1 times in the presence of inorganic ions (SO 4 2− , Cl − and HCO 3 − ) and natural organic matter (NOM) compared with Fe 0 /EDTA/air system. Decrease of Fe 0 contact angle in the presence of magnetization and EDTA enhanced the corrosion rate of Fe 0 . Accordingly, pre-Fe 0 /EDTA/air system would be a cost-effective and promising eco-friendly alternative for removal of SMT.
研究领域:
环境科学
·
水处理技术
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2015
·
IF 4.321
Bin Jiang,Huawei Yang,Luhong Zhang,Rongya Zhang,Yongli Sun,Yong Huang
A series of Brønsted acidic ionic liquids having a protonated amide- or lactam-based cation were synthesized and investigated as extractants and catalysts in the extraction combined with oxidative desulfurization (ECODS) of both model oil and diesel fuel, with hydrogen peroxide (H 2 O 2 , 30 wt%) as oxidant. Each of them showed obvious removal of benzothiophene (BT) and dibenzothiophene (DBT) in model oil. Among them, [HCPL][TFA] exhibited the best performance by completely removing BT and DBT in a short time. The detailed structure and conformation of [HCPL][TFA] were investigated by 1 H NMR and FTIR as well as theoretical calculation. HCPL + cation was verified to exist in an enol form, which was supposed to contribute to high desulfurization performance by improving the formation of peroxides. In the end, two kinds of diesel were used to evaluate its desulfurization performance. [HCPL][TFA] can reduce the S-content of real hydrogenated diesel from 659.7 ppm to 8.62 ppm with 98.69% S-removal efficiency after two ECODS processes. Furthermore, the total S-content of straight-run diesel fuel was reduced to 89.36 ppm from 11,034 ppm with a similar S-removal rate. The results of GC-PFPD before and after each ECODS process indicated that almost all the original S-compounds in diesel had been converted to their corresponding oxidation products. The desulfurization performance was actually restricted by extraction capability.
研究领域:
化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2014
·
IF 3.84
Huihui Chen,Zhiqiang Liu,Duxia Cao,Shanshan Lu,Jingzhong Pang,Yunhui Sun
Two new fluorescence turn-on chemosensors for cyanide based on dipyridylamine substituted aurone moiety have been synthesized. The strong yellow-green fluorescence of the compounds were completely quenched after the addition of Cu(II) ions because of the complexation between the compounds and Cu(II) ions and were almost recovered after the addition of cyanide owing to the strong bonding ability between cyanide and Cu(II) ions, which lead to the removal of copper ions from the complexes. The chemosensors exhibit good repeatability.
研究领域:
分析化学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2018
·
IF 2.891
Lulu Tong,Ying Qian
A naphthalimide-rhodamine fluorescent turn-on probe RHSNO with red emission for hypochlorous acid based on dual reaction linkage induce through-bond energy transfer (TBET) system was designed and synthesized. Rhodamine B thiohydrazide and naphthalimide -N,N- dimethylthiocarbamate (DMTC) were linked to form a structure of monothio-bishydrazide. In addition, introduce dimethylthiocarbamoyl chloride as another reaction site of ClO − , and it acts to quench the fluorescence of naphthalimide. In the presence of ClO − , RHSNO exhibits high selectivity toward ClO − at trace levels over other anions/ROS based on ClO − -triggered intramolecular desulfurization cyclization of rhodamine-thiohydrazide, the spiro ring of rhodamine was opened and meanwhile desulfurization hydrogenation happened at DMTC of naphthalimide moiety. These dual linkage reaction happened simultaneously made a typical TBET process took place from naphthalimide donor to rhodamine acceptor, an obvious increase of rhodamine emission at 590 nm and enhanced up to 260-fold gradually after adding ClO − with the increase of the concentrations. The efficiency of energy transfer was calculated to be 86%. And the quantum yield of rhodamine moiety is 0.64. Besides, the chemodosimeter RHSNO for ClO − with high sensitivity, a dramatic color change from colorless to brightly pink among 2 s after the addtion of ClO − . The detection limit was determined to be 22.1 nM and works excellently within a wide pH range of 5–10. Moreover, RHSNO had been employed for endogenous imaging in MCF-7 cell for ClO − . The results indicated that the probe could permeated into the cells and reacted with the intracellular ClO − . It is excellent to design fluorescence sensor RHSNO as a quick and effective method for detecting excess ClO − in living cell, for maintaining the balance of hypochlorite in the body and ensure normal life activities.
研究领域:
生物化学
·
医学检测
·
荧光分析
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Xingxu Gao,Lei Sheng,Menglin Li,Xin Xie,Ling Yang,Yun Gong,Min Cao,Yaozong Bai,Haoyu Dong,Gaojun Liu,Tao Wang,Xianli Huang,Jianping He
Commercial polyolefin separators often cause explosions and thermal runaways in lithium-ion batteries due to their poor thermal stability. Therefore, various polymer separators with high thermal stability have attracted the attention of researchers. In this paper, a kind of special nano-TiO2/Polyimide (TiO2@PI) composite separator was prepared by adding nano-TiO2 particles with certain content to the PAA solution before electrospinning. It is found that the added TiO2 ceramic particles greatly improve the flame retardant performance of the separator, and at the same time, they inhibit lithium dendrites and prevent the internal short circuit of the battery. As a result, the TiO2@PI nanofiber separator (5.0-TiO2@PI) prepared by a spinning solution with a TiO2 concentration of 5.0 wt % is formed by connecting spherical beads with a diameter of about 500 nm, which greatly inhibits lithium dendrites. It has better properties, such as electrolyte uptake (721%) and ionic conductivity (2.52 mS cm–1). The LiCoO2/Li battery based on 5.0-TiO2@PI nanofiber separator has a higher discharge capacity even at a current density of 4 C, which is better than that of PE separator. The use of this 5.0-TiO2@PI nanofiber separator has enlightening significance for the safety of high energy density batteries.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2022
·Vol. 169
·期 11
·110539
·
IF 4.386
Wen Xie,Wenxian Yang,Ping Xie,Wenjiang Xie
Polyaniline (PANI) has good electrical conductivity, diverse redox chemistry, and a unique doping/dedoping mechanism. Furthermore, the facile synthesis, controllable morphology, and the ability to grow in situ on substrates provide the impetus to obtain aqueous Zn-ion batteries (ZIBs) with PANI as a cathode. However, due to its poor redox reversibility in a near-neutral electrolyte environment, the resulting ZIBs have a rapid capacity drop, poor rate performance, and poor cycling stability. To improve the electrochemical performance of PANI cathodes in ZIBs, zinc ions are doped into PANI and incorporated with carbon nanotubes (CNTs) by one-step polymerization. The results show that the use of Zn-doped PANI and CNTs composites can enhance the conductivity and stability of PANI, and further improve the capacities, rate performances, and cycle life of the ZIBs. The battery assembled with an optimized PANI-based cathode exhibits a high specific discharge capacity of 156.7 mAh g−1 at 0.05 Ag−1, and excellent capacity retention of 95% after 800 charge/discharge cycles. Additionally, the Zn//PANI battery shows a promising energy density of 166.7 Wh kg−1, together with a power density of 111.2 W kg−1. Such Zn ion-doped PANI-CNTs cathode material may provide significant insight into future large-scale industrial production for Zn//PANI batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Yingjuan Sun,Jiefeng Zheng,Yang Yang,Jianhao Zhao,Jianhua Rong,Hongyan Li,Li Niu
We reports an all-conductive polymers composite with cross-linking network structures composed of porous polyaniline (PANi) and PEDOT:PSS. This composite with unique structures and morphological properties has the ability to be utilized as cathode for sodium ion batteries (SIBs). Specifically, the cathode delivers a high reversible capacity of 81.9 mA h g −1 at a current density of 100 mA g −1 and represents outstanding cycle stability. Remarkably, the PANi-PEDOT cathode exhibits a high performance compared with state of the art performance of cathode materials for SIBs, for instance, Na 2 Fe 2 (SO 4 ) 3 , Na 0·6 Cr 0·6 Ti 0·4 O 2 and Na 2 MnP 2 O 7 . Moreover, the kinetics analysis of cyclic voltammetry represents predominant capacitive process, which plays dominant roles in charge storage. These conductive cross-linking networks structures and high stability endow the cathode good electrical conductivity and play important roles in the cycling stability of the Na ion cathode, thus promoting the electrochemical performances of the cathode, offering a great promise in SIBs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）