JOURNAL OF APPLIED POLYMER SCIENCE
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2013
·Vol. 130
·期 2
·1058-1063
·
IF 1.395
Xiulan Zhao,Qin Zhang,Lixin Xue,Qianru Shi,Kang Tao
Poly(ether ether ketone) with pendent sulfonimide groups (B-SPEEK) was prepared from poly(ether ether ketone), sulfuric acid, thionyl chloride, para -toluene sulfonate, and pyridine. The prepared B-SPEEK was characterized by Fourier transform infrared spectroscopy, 1 H-NMR, and thermogravimetric analysis. The swelling of the gels was examined in N,N -dimethylacetamide (DMAC), N,N -dimethylformamide (DMF), 1-methyl-2-pyrrolidinone (NMP), dimethyl sulfoxide (DMSO), and a DMSO/water mixture. The gel showed extremely high swelling in DMSO, DMF, DMAC, and NMP. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1058-1063, 2013
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yucong Liao,Shengqiu Zhao,Guoliang Liu,Hao Li,Jiaqi Shuai,Letian Wang,Bingxuan Liu,Haolin Tang
Proton exchange membrane fuel cells (PEMFCs) face a significant challenge when operating in high-temperature and low-humidity environments, the hydrocarbon-based polymers that are sulfonated or phosphonated can’t meet the demand for achieving high performance. Modifying perfluorosulfonyl fluoride (PFSF) through meticulous design of side-chain chemical structures and introducing functionalized sulfonimide and phosphonic acid groups. Membranes derived from a perfluorocarbon backbone and polyacid side chain structures exhibit distinct microphase separation. The sulfonimide group exhibits hyper-acidic properties, whereas the phosphonic acid group functions as proton acceptor and donor. These two groups work synergistically to establish a distinct proton transport channel. The robust adsorption between acidic functional groups and water molecules enhances the diffusion of water molecules, resulting in an increase in proton conductivity. Moreover, Density Functional Theory (DFT) calculations reveal that the phosphonic acid group of the side chain has difficulty forming anhydrides. The prepared perfluorosulfonimide-phosphonic acid (PFSNPA) proton exchange membrane demonstrates an impressive conductivity of 263 mS·cm −1 at 120 °C. In H 2 /Air fuel cell tests, PFSNPA achieves an outstanding output power of 1076.1 mW·cm −2 at 120 °C and 40 % RH. This study introduces a new approach for designing and fabricating proton exchange membrane materials for high-temperature fuel cells.
研究领域:
材料科学
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能源工程
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Jing Jin,Renyuan Wang,Ke Yu,Yueheng Tao,Peipei Zhang,Lei Ke,Jun Yang,Minjie Shi
The design of innovative faradaic electrode materials is crucial for improving the removal efficiency of contaminants in hybrid capacitive deionization (HCDI) systems. Organic compounds are a promising choice for faraday electrodes due to the sustainable production and tunable molecular structure. However, their high solubility in aqueous media and limited availability of redox-active sites for deionization greatly constrain the HCDI applications. Herein, we intentionally construct a conjugated polymer (IMP) with abundant imine groups, in which the strategic integration of N-heteroaromatic rings within the π-conjugated framework effectively prevents the disintegration of redox-active entities, while honing the energy bandgap and electronic characteristics. The copious redox-active C N sites within the imine groups along the polymeric chain markedly improve its capacity for the high-efficiency (de)intercalation of NH 4 + ions. As an electrode material, the IMP polymer exhibits a significant NH 4 + -storage capacitance of 257.1 F g −1 at 2 A g −1 and maintains an ultra-cycle stability of 96.1 % after 10,000 cycles (4 A g −1 ), as evidenced by the in-situ spectral analysis of electrolyte. For real applications, a HCDI configuration has been constructed with a high specific NH 4 + adsorption capacity of 119.0 mg g −1 and a fast removal rate of 27.0 mg g −1 min −1 with stable regeneration performance.
研究领域:
材料科学
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环境工程
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化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 141
·期 2
·e54792
·
IF 3
Qian Chen,Dayong Ren,Weichen Sheng,Kan Zhang
Two novel bio-based benzoxazine monomers containing imide or amide group (HPIDD-fa and HPBA-fa) were synthesized from raw materials of benzoyl chloride/phthalic anhydride, tyramine, furfurylamine and paraformaldehyde via a two-step reaction. Fourier transform infrared spectroscopy (FT-IR), proton and carbon nuclear magnetic resonance (NMR) spectroscopies were performed to characterize the structures of the benzoxazine monomers. The curing behavior was investigated by using differential scanning calorimetry (DSC) and in situ FT-IR, and the DSC results indicate that the peak curing temperatures of HPIDD-fa and HPBA-fa are centered at 248.5 and 230.1°C, respectively. In addition, thermogravimetric analysis (TGA) suggests that the newly developed bio-based benzoxazine-derived polybenzoxazines present excellent thermal stability with T d10 (temperature at 10% weight loss) of 385 and 368°C for poly(HPIDD-fa) and poly(HPBA-fa), respectively. The current investigation suggests that our newly obtained bio-based thermosetting resins are promising materials for high-tech applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
POLYMER SCIENCE SERIES B
·
2018
·Vol. 60
·期 5
·578-588
·
IF 0.735
Shang Jiaojiao,Lan Jianwu,Yao Guo,Yan Bin,Guo Ronghui,Zheng Wei,Gu Long
A series of poly(ester-imide-ether), consisting of soft segments from poly(tetramethylene glycol) and N,N ′-bis(2-carboxyethyl) pyromellitimide and hard segments based on 1,4-butanediol and N,N ′-bis(2-carboxyethyl) pyromellitimide, were synthesized via the melt polycondensation. The chemical structures of the prepared elastomers were confirmed by Fourier transform infrared spectroscopy and 1 HNMR, respectively. The results indicated that the introduction of aromatic bisimide groups endows the elastomers with excellent thermal stability and mechanical property, which increase with the increment of imide unit content in the prepared elastomers. Additionally, compared to the poly(ester-ether) elastomer, these poly(esterimide-ether) fibers displayed stronger tensile strength and better low-temperature elastic recovery property.
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
THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Weifeng Peng,Yang Liu,zhengzhou Liu,Zheng Lu,Jianghuai Hu,Ke Zeng,Gang Yang
Phthalonitrile and alicyclic imide moiety blends were obtained by mechanical mixing, and the curing behaviors and kinetics parameters of the phthalonitrile/alicyclic imide moiety systems were investigated by non-isothermal differential scanning calorimetry (DSC). The results showed that an apparent autocatalytic model dα/dt = k(T)α m (1 − α) n can be determined to describe the systems, and the apparent activation energy of 3BOCN/CC-55, 3BOCN/CC-73 and 3BOCN/HCC-55 are 105.9, 120.6 and 83.4 kJ/mol with not much different reaction orders 1.67, 1.49 and 1.56, respectively. The conversions which are approximately 0.36, 0.41 and 0.40 corresponding to the maximum reaction rate values of 3BOCN/CC-55, 3BOCN/CC-73 and 3BOCN/HCC-55 are experimentally determined, respectively, which are in good agreement with the fitting values.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
LIQUID CRYSTALS
·
2025
·
IF 2.2
Mi-Yi Yu,Wen Xin,Di Ke,Ji-Feng Gao,Shuai-Yin Ma,Xiao-Zhi He
Fluorescent liquid crystal polymers (PFL1-PFL10) with temperature dependent of selective reflectance and fluorescence properties were obtained by graft copolymerisation of naphthalimide fluorescent monomers (FA and FB) containing different halogen atoms with cholesterol monomer (MA) and monomer containing cyanide (MB) onto polysiloxane chains. Among them, PFL2-PFL7 are polymers containing FA and FB fluorescent monomers, while PFL1 and PFL8-PFL10 are polymers containing only FA or FB fluorescent monomer; detailed comparative analysis was conducted on their liquid crystal and fluorescence performance. The structures of monomers and polymers were characterised using infrared spectroscopy and nuclear magnetic resonance, and the synthesised monomers and polymers conform to molecular design. By analysing the liquid crystal and thermal properties of the polymer through POM, DSC, XRD and TGA, it was demonstrated that the polymers are cholesteric liquid crystal polymer with excellent performance. The fluorescence properties of the polymer were analysed by fluorescence spectroscopy, and it was found that fluorescence quenching only occurs when the total content of FA and FB exceeds 20%. Simultaneously, the relationship between fluorescence performance and temperature was studied, and beneficial conclusions were drawn.
研究领域:
高分子化学
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材料科学
·
液晶技术
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光学材料
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荧光光谱学
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高影响因子
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
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材料科学
·
热分析
·
机械工程
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DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jinwei Teng,Lei Qu,Zhengqi Liu,Zihao Qin,Jing Xu,Zhongni Wang,Zhaosheng Hou
Designing a polymeric elastomer that exhibits superior tensile properties, as well as efficient self-healing ability at mild temperatures, remains challenging. This study reports a polyurethane elastomer that contains imine and metal coordination bonds, by a facile method. The linear polyurethane (HPPU), bearing pendant ligands of phenolic oxygen and imine groups, originates via two-step polycondensation of hexamethylene diisocyanate, polytetrahedrofuran, and 2-{[(2-hydroxyphenyl) methylene]amino}-1,3-propanediol. Upon incorporation of Co(II) into the polymeric matrix, HPPU becomes an elastomer (HPPU-Co) with a physical crosslinked structure by the formation of metal coordination bonds. The dynamic reversible Co(II)–ligand coordination bonds in the structure impart the HPPU-Co elastomers with autonomous self-healing capacity at mild temperatures, and the tensile properties are adjustable by controlling the Co(II)/ligand ratio. When the mole ratio of Co(II)/ligand is 1:2, the as-prepared elastomer (HPPU-Co-1/2) exhibits superior tensile properties (ultimate tensile strength: 48.7 MPa; elongation at break: 1678%; fracture toughness: 287.7 MJ m–3) as well as self-healing abilities and repeated healing at room temperature [healing efficiency: 99.7% for the first healing and 81.2% for the sixth healing (24 h)]. Furthermore, the HPPU-Co elastomers exhibit reversible solvatochromic behaviors: the film color changes from blackish-green to red-brown upon dipping into water. The design concept in this work is an approach to preparing multifunctional polyurethane materials. The resultant polyurethane elastomers have multiple useful features and show promise for many fields that require long functional lifetimes.
研究领域:
材料科学
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高分子化学
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机械工程
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产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Qian Wang,Liang Shao,Zhonglei Ma,Juanjuan Xu,Ying Li,Caiyun Wang
Metal-Organic Frameworks (MOFs) have attracted increasing attention in the field of energy storage owing to their high porosity, high specific surface area, high charge storage. However, the poor conductivity in most MOFs largely hinders their electrical properties. In this work, we developed an effective strategy to grow the conductive polyaniline (PANI) inside the pores of MIL-101 (labeled as PANI/MIL-101) to form a fixed interpenetrating network structure. The electron-rich imine group in PANI is chelated with the coordinatively unsaturated metal sites (CUS) in MIL-101 to form a relatively strong bonded complex and through other synergistic effects to enhance the conductivity and electrochemical properties. The resultant PANI/MIL-101 exhibited a superior high capacitance of 1197 F g −1 (i.e., 957.6C g −1 ) at 1 A g −1 in constant current charge and discharge test. The assembled flexible solid-state supercapacitor showed a favorable specific capacitance, power density and good cycling stability (a 81% capacitance retention rate over 10,000 cycles). It also demonstrates a good flexibility, as evidenced by a small capacitance loss of 10% after being subject to 1000 bending cycles at 180°. The PANI/MIL-101 nanocomposite showed great potential in energy storage device.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2023
·
IF 6.4
Qin Feng,Yingnan Cao,Chaofei Guo,Ling Chen,Weiwei Sun,Yong Wang
Organic electrodes have been identified as promising energy-storage materials for aqueous zinc-ion batteries (AZIBs). Small molecular materials have ideal redox properties, high specific capacity, and structural diversity, making them a category of cathode candidates for AZIBs. However, the instability and dissolution during the extraction and insertion of H+/Zn2+ limit their application of the long-cycle stability for AZIBs. Herein, a small-molecule nanosheet (NI-DAQ, ∼14 nm in thickness) with imide linkage is designed and synthesized by the condensation of anthraquinones and anhydrides. It not only inhibits the dissolution of monomer electrodes but also boosts the reactivity and conductivity of the whole molecule by the introduction of π-conjugated imide groups and extended aromatic planes. Therefore, the NI-DAQ electrode obtains a large initial capacity of 191.9 mA h g–1 at 50 mA g–1 and superior cyclability after 3000 cycles at 500 mA g–1 with a minor average capacity fading rate of 0.01% per cycle. Moreover, in situ Fourier transform infrared (FT-IR) and ex situ X-ray photoelectron spectroscopy (XPS) characterization techniques have been implemented to investigate the redox mechanism of C═O units in AZIBs for the NI-DAQ electrode. Thus, a promising conductive molecule is developed and explored in this paper, which can provide insights into the application of organic materials in AZIBs.
研究领域:
材料科学
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电化学
·
能源存储
✓ 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）