JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 128
·期 6
·3540-3547
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IF 1.289
Hongli Yao,Xiaohui He,Lu Chen,Yiwang Chen,Defu Chen
Novel sulfonated poly(2-butoxymethylenenorbornene-co-2-(6-phenoxy-hexyloxymethylene)-5-norbornene [sP(BN/PhHN)] were prepared successfully through vinyl-addition type polymerization and then sulfonated with concentrated sulfuric acid (98%) as sulfonating agent in a component solvent. The sP(BN/PhHN)-40 with the maximal degree of sulfonation of 40% can be obtained by controlling the sulfonating reaction time from 8 to 20 h, and a proton conductivity of 3.35 × 10 −3 S/cm was achieved at 70°C. The methanol permeabilities of these membranes were in the range from 0.26 to 6.58 × 10 −7 cm 2 /s, which were remarkably lower than Nafion (2.36 × 10 −6 cm 2 /s). TEM analysis revealed that these side-chain type membranes have a microphase separated structure composed of hydrophilic side-chain domains and hydrophobic polynorbornene main chain domains. Sulfonated polynorbornene containing soft spacers displayed better properties, such as lower water uptake, high thermal properties, mechanical properties, and low methanol permeability. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2016
·Vol. 134
·期 9
·
IF 1.866
Xin Liu,Yunfei Zhi,Shaoyun Shan,Hongying Su,Qingming Jia
A novel polysulfone was easily synthesized by alternating copolymerization of norbornene with sulfur dioxide (SO 2 ) via free radical copolymerization and coordination copolymerization. Compared with other olefin derivatives, norbornene is a cyclic olefin having a larger steric hindrance, which is easily copolymerized with SO 2 , and the obtained poly(norbornene sulfone)s have excellent thermomechanical and optical properties. The effect of the different polymerization methods on the copolymerization reaction was analyzed in detail. The results suggested that different polymerization mechanisms exist in the different polymerization methods and affect the thermal stability and optical properties of the polysulfone. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44534.
研究领域:
高分子化学
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材料科学
·
高分子物理
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DOI
高影响因子
DALTON TRANSACTIONS
·
2019
·Vol. 48
·期 32
·12219-12227
·
IF 4.052
Fen You,Hui Liu,Gen Luo,Xiaochao Shi
Nickel and palladium complexes bearing new diarylamido-based unsymmetrical [NNNox] and [SNNox] pincer ligands were synthesized and tested for the polymerization of norbornene. Upon the activation of MAO, all the palladium complexes showed high catalytic activities for the vinyl-addition polymerization of norbornene up to 5.32 × 107 g of PNB (mol of Pd)−1 h−1, while the corresponding nickel complexes exhibited unsatisfactory catalytic activities. Besides the usual steric and electronic effects, the sidearm effects of quinolino ([NNNox] ligands) and phenylthio ([SNNox] ligands) moieties have also exhibited obvious influence on the catalytic performance for the polymerization of norbornene and were further studied by density functional theory (DFT) calculations.
研究领域:
有机金属化学
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高分子化学
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催化化学
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DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Fangbin Fan,Xiaobin Nie,Chao Fan,Xiaojing Liang,Xiaofeng Lu,Yong Guo
In this paper, L (+)-Cysteine (L-Cys) and 5-norbornene-2-carboxylic acid (5-N-2-CA) were modified on the silica spheres by cross-linking polymerization and thiol-ene click reaction. The Cys-Si-NCA was characterized by scanning electron microscopy, nitrogen sorption porosimetry , thermogravimetric analysis and other characterization methods. The results indicated that the colume had a regular spherical shape with porous surfaces and particle sizes mainly ranging from 4.5 to 5.5 μm. The surface area of the Cys-Si-NCA microspheres was 328.68 m 2 g −1 , and their respective average pore size was 9.27 nm. Furthermore, the colume exhibited excellent stabilities and reproducibility. Experimental results demonstrate that this new stationary phase can facilitate the separation of sulfonamides, nucleosides and nucleobases compounds in hydrophilic chromatographic (HILIC) conditions. In addition to being able to attenuate the peak tailing of separation, it can also be used for quantitative analysis of creatinine in urine. We also give the temperature and pH ranges of separation on Cys-Si-NCA column. The successful synthesis of the Cys-Si-NCA stationary phase provides foundation for the application of this kind of materials in liquid chromatography (LC).
研究领域:
分析化学
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材料科学
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产品关联
DOI
高影响因子
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2024
·
IF 2.1
Lifen Xiao,Hongwei Peng,Xiaoming Zhu,Yang Huang,Geng Huang,Wei Li
Endo-norbornene derivatives are much cheaper and more accessible. However, it is difficult to prepare endo-polynorbornenes with ultra-high molecular weight (UHMW) by ring opening metathesis polymerization (ROMP) owing to the low activity. The molecular weight of poly(endo-NB-2OH)n could only reach to 309.1 kg mol−1 for 24 h via ROMP. While, UHMW poly(endo-NB-2OH)m was prepared by combining ROMP and acyclic metathesis reaction in much shorter time. The effects of residual monomer, amount of H2SO4, concentration, temperature and reaction time were investigated in depth. The UHMW P(endo-NB-2OH)m (Mn=2645.5 kg mol−1, PDI = 1.74) could be obtained at 80 °C for 5 min with H2SO4/G3 as 10/1 and concentration of 0.1 M. Moreover, UHMW P(endo-NBI-OH)m(Mn=1114.2 kg mol−1, PDI = 1.95) was also successfully prepared by this method. However, the H2SO4/G3 should increase to 30/1, and reacted for 45 min owing to the steric resistance of the cyclic dicarboximide. For P(exo-NBI-OH)n with lower activity, reaction time should prolong to 3 h to obtain UHMW P(exo-NBI-OH)m(Mn=1716.7 kg mol−1, PDI = 1.93). Finally, UHMW P(endo-NB-2alkyne)m, P(endo-NBI-alkyne)m, and P(exo-NBI-alkyne)m were successfully prepared via post-modification. Acyclic metathesis reaction is a robust and universal reaction to prepare other functional UHMW polynorbornenes, especially for the UHMW endo-polynorbornenes, which could not be prepared by ROMP efficiently.
研究领域:
高分子化学
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有机合成
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功能高分子
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材料科学
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聚合物化学
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DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 10
·1-9
·
IF 3.061
Huangfu Fei,Li Wanrong,Yang Zhongqiang,You Jiang,Yang Po
This work aims to explore the bulk ring-opening metathesis copolymerization of dicyclopentadiene and 5-ethylidene-2-norbornene by modifying the comonomer feed ratios. Thorough studies showed that their performance can be enhanced by polymerization at elevated temperature and there was a little deviation of properties from mixing rules. That is, the copolymers properties depend on monomer composition and can be roughly predicted by empirical mixing rules. We believe this can help researchers design and prepare ROMP derived polydicyclopentadiene copolymers and apply them in more applications.
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
BIOMACROMOLECULES
·
2023
·
IF 6.2
Xiong Xiao,Yuchu Yang,Yushang Lai,Ziwei Huang,Chenxi Li,Shaojie Yang,Chuan Niu,Liping Yang,Li Feng
Light-based three-dimensional (3D) bioprinting has been widely studied in tissue engineering. Despite the fact that free-radical chain polymerization-based bioinks like hyaluronic acid methacrylate (HAMA) and gelatin methacryloyl (GelMA) have been extensively explored in 3D bioprinting, the thiol–ene hydrogel system has attracted increasing attention for its ability in building hydrogel scaffolds in an oxygen-tolerant and cell-friendly way. Herein, we report a superfast curing thiol–ene bioink composed of norbornene-modified hyaluronic acid (NorHA) and thiolated gelatin (GelSH) for 3D bioprinting. A new facile approach was first introduced in the synthesis of NorHA, which circumvented the cumbersome steps involved in previous works. Additionally, after mixing NorHA with macro-cross-linker GelSH, the customized NorHA/GelSH bioinks exhibited fascinating superiorities over the gold standard GelMA bioinks, such as an ultrafast curing rate (1–5 s), much lowered photoinitiator concentration (0.03% w/v), and flexible physical performances. Moreover, the NorHA/GelSH hydrogel greatly avoided excess ROS generation, which is important for the survival of the encapsulated cells. Last, compared with the GelMA scaffold, the 3D-printed NorHA/GelSH scaffold not only exhibited excellent cell viability but also guaranteed cell proliferation, revealing its superior bioactivity. In conclusion, the NorHA/GelSH system is a promising candidate for 3D bioprinting and tissue engineering applications.
研究领域:
组织工程
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生物打印
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生物材料
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材料科学
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细胞生物学
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 9
·3944
·
IF 4.6
Yin Lu,Yaliang Peng,Yi Yang,Jiahao Liu,Kan Zhang
There is an urgency to produce novel high-performance resins to support the rapid development of the aerospace field and the electronic industry. In the present work, we designed and consequently synthesized a benzoxazine monomer (oHPNI-fa) bearing both norbornene and furan groups through the flexible benzoxazine structural design capability. The molecular structure ofoHPNI-fawas verified by the combination characterization of nuclear magnetic resonance spectrum, FT-IR technology, and high-resolution mass spectrum. The thermally activated terpolymerization was monitored by in situ FT-IR as well as differential scanning calorimetry (DSC). Moreover, the low-temperature-curing characteristics ofoHPNI-fahave also been revealed and discussed in the current study. Furthermore, the curing kinetics of theoHPNI-fawere investigated by the Kissinger and Ozawa methods. The resulting highly cross-linked thermoset based onoHPNI-fashowed excellent thermal stability as well as flame retardancy (Td10of 425 °C, THR of 4.9 KJg−1). The strategy for molecular design utilized in the current work gives a guide to the development of high-performance resins which can potentially be applied in the aerospace and electronics industries.Keywords:benzoxazine;norbornene;furan;thermosets;thermal stability
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
PubMed
高影响因子
FLUID PHASE EQUILIBRIA
·
2019
·
IF 2.514
Yameng Wan,Haixia He,Pengshuai Zhang,Rui Zhao,Jiao Sha,Tao Li,Baozeng Ren
Mole-fraction solubility of 5-norbornene-2,3-dicarboximide (NODI) in eleven solvents including methanol (MtOH), ethanol (EtOH), 2-ethoxyethanol, methyl acetate (MAC), ethyl acetate (EAC), n-propyl acetate (NPAC), isopropyl acetate (IPAC), n-butyl acetate (NBAC), acetone (DMK), N,N-dimethylformamide (DMF) at (278.15–323.15) K and 1,4-dioxane at (288.15–323.15) K was experimentally measured by laser monitoring technique under 0.1 MPa. Solubility of NODI increased with the increasing temperature. Hansen Solubility Parameter was employed to explain the solubility behavior. The Kamlet-Taft parameters were calculated to investigate the solvent effect based on linear solvation energy relationships concept. Thermodynamic modeling including the Two-Suffix Margules model, Wilson model, NRTL model, NRTL-SAC model and UNIQUAC model were employed to correlate the experimental solubility. Wilson model and NRTL-SAC model were more suitable in correlation with solubility data. Furthermore, thermodynamic properties of mixing process (Δ mix G , Δ mix H , Δ mix S , ln γ 1 ∞ , H 1 E,∞ , ζ TS and ζ H ) were discussed based on Wilson equation.
研究领域:
化学工程
·
物理化学
·
热力学
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DOI
高影响因子
FUEL
·
2023
·
IF 7.4
Junjian Xie,Yuxuan Liang,Bo Yang,Jun Zhang,Jiawei Xie,Ji-Jun Zou,Qiuyu Zhang
Solar-energy-driven synthesis of high-density biofuels can help to achieve the dual carbon goal of the aviation industry sooner. Herein, a novel photo-Conia strategy was developed for synthesis of high-performance asymmetric polycyclic hydrocarbons from biomass-derived various ketones and petroleum-derived norbornene. The photosensitized Conia reaction mechanism is comprehensively revealed by the combination of monochromatic light excitation, triplet quenching, phosphorescence quenching, Stern-Volmer kinetic analysis and DFT calculations. The photoaddition of cyclopentanone and norbornene has a much faster reaction rate than self-cycloaddition of norbornene, and the green solvent water can promote both the norbornene conversion and the selectivity of monoadduct, along with the optimal norbornene conversion of 94.9 % and monoadduct selectivity of 91.6 %. After hydrodeoxygenation, the hydrocarbon derived from cyclohexanone/norbornene mixture endows high density of 0.941 g∙mL −1 (20.6 % higher than conventional aviation kerosene, 0.78 g∙mL −1 ) and volumetric net heat of combustion of 40.11 MJ∙L −1 , which is much higher than that of classic JP-10 (39.41 MJ∙L −1 ). Therefore, this work provides a new and eco-friendly route for synthesis of high-performance hydrocarbons using renewable resources (biomass) and renewable energy (solar energy).
研究领域:
有机化学
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可再生能源
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2026
·
IF 8.7
Ying Yu,Yonggang Peng,Sekar Vijayakumar,Yikai Chen,Yangfan Mao,Meihua Xin,Mingchun Li
This study aims to develop a novel chitosan-based pH-responsive hydrogel for sustained curcumin (Cur) delivery. Chitosan was modified with norbornene dicarboxylic anhydride to introduce reactive double bonds and enhance solubility, while cysteine-modified Pluronic F127 was crosslinked via UV-induced thiol–ene chemistry to form a stable three-dimensional network. The hydrogel structure was tuned by adjusting the CSNB/CPC ratio and characterized using 1 H NMR, solid-state 13 C NMR, FTIR, TGA, XRD, SEM, and rheology. The optimized hydrogel achieved a drug loading capacity of 13.3 mg/g and exhibited pH-responsive release in simulated gastrointestinal fluids, with kinetics well-fitted to the Peppas–Sahlin model (R 2 > 0.98), dominated by Fickian diffusion. Functional evaluation showed that NC4 displayed nearly 90% DPPH radical scavenging efficiency, and its antioxidant potential was further supported by the Folin–Ciocalteu (GAE) assay and the phosphomolybdenum (AAE) assay, indicating enhanced overall reducing capacity and total antioxidant capacity. NC4 also exhibited strong antibacterial activity against Staphylococcus aureus and Escherichia coli . Biocompatibility was confirmed by CCK-8 and hemolysis assays, with cell viability exceeding 90% and hemolysis rates below 0.35%. Collectively, this multifunctional hydrogel integrates sustained release, antioxidant, antibacterial, and excellent biocompatibility, providing a promising material platform for oral controlled drug delivery and wound healing applications.
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 27
·22908-22916
·
IF 3.289
Jianwen Tian,Xiaohui He,Jingyin Liu,Xiaodan Deng,Defu Chen
Palladium(II) and copper(II) chloride complexes bearing bulky 9,10-dihydro-9,10-ethanoanthracene-11,12-diimine ligands were synthesized and sufficiently characterized by elemental and spectroscopic analysis along with X-ray diffraction analysis. The X-ray diffraction demonstrated that palladium(II) complexes (C1–C2) and copper(II) complexes (C3–C4) were four-coordinated. All these complexes displayed catalytic activities up to 105 gpolymer molMt−1 h−1 for norbornene vinyl-addition polymerization on treatment with excess methylaluminoxane (MAO). The parameters of the reaction conditions, the type of metals and steric effects of coordinative ligands had influences on the catalytic properties. C2 was selected as a catalyst precursor for the copolymerization of norbornene (NB) with 2-butyloxymethylene norbornene (BN), which exhibited catalytic activities up to 1.1 × 105 gpolymer molPd−1 h−1 and produced copolymers with relatively high molecular weights. The fraction of BN in the copolymer could reach up to 9.8–62.1% by controlling the monomer feed ratio range from 10–80%. The achieved vinyl-addition type poly(NB-co-BN) displayed high thermal stability and was soluble in common organic solvents, such as CHCl3 and THF.
研究领域:
高分子化学
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配位化学
·
催化化学
·
有机金属化学
·
功能高分子材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）