JOURNAL OF POLYMER RESEARCH
·
2012
·Vol. 19
·期 10
·1-12
·
IF 1.733
Hu Meiping,He Xiaohui,Chen Yiwang,Chen Defu
Novel copolynorbornenes bearing pendant sultone groups (designated as P(BN/SulNBOH) and P(BN/SulNBOMe)) have been successfully synthesized via copolymerization of functionalized norbornenes bearing sultones (designated as SulNBOH and SulNBOMe) with 2-butoxymethylene norbornene (BN). The catalyst system showed high catalyst activity (10 4 g polymer /mol Ni ·h) and the obtained copolymers have high molecular weight and a narrow molecular weight distribution. Furthermore, the achieved copolymers P(BN/SulNBOH) and P(BN/SulNBOMe) were converted into sulfonated copolymers sP(BN/NBOH) and sP(BN/NBOMe). Both sP(BN/NBOH) and sP(BN/NBOMe) membranes displayed low water uptake, high thermal properties, good mechanical properties, and better proton exchange membranes properties. The proton conductivities measured in the hydrated state at 80 °C ranged from 10 −5 to 7.19 × 10 −3 S·cm −1 .
Novel copolynorbornenes bearing pendant sultone groups are synthesized. The achieved copolymers are converted into the sulfonated copolymers. The proton conductivities of the membranes measured in the hydrated state at 80 °C ranged from 10 −5 to 7.19 × 10 -3 S·cm −1 .
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 47
·期 1
·180-189
·
IF 4.029
Dandan Yang,Jie Dong,Baiquan Wang
A series of new pincer-type tridentate o-aryloxide-N-heterocyclic carbene nickel complexes Ni1–Ni3 were synthesized, and the molecular structure of Ni3 was confirmed by X-ray crystallography. In comparison with the above tridentate complexes, the bidentate bis(aryloxide-NHC) nickel complex Ni4 was also synthesized. On activation with either Et2AlCl or Me2AlCl, all nickel complexes showed low activity toward norbornene (NB) homopolymerization. Surprisingly, Ni1–Ni3 catalysts exhibited moderate to high activity toward the homopolymerization (up to 3.21 × 106 g PNB (mol of Ni)−1 h−1) and copolymerization of norbornene with 1-octene (up to 1.39 × 105 g polymer (mol of Ni)−1 h−1) with B(C6F5)3 as the cocatalyst even at 100 °C, showing that tridentate nickel catalysts have high thermal stability. Notably, the tridentate Ni1–Ni3 complexes showed better activities than the corresponding bidentate bis(aryloxide-NHC) nickel complex Ni4. The obtained poly(NB-co-1-octene)s were confirmed to be vinyl-addition copolymers, which exhibited high 1-octene insertion ratio (9%–17%), good thermal stability (Td > 400 °C), high molecular weight (up to 105), and narrow molecular weight distribution (PDI ≤ 1.91).
研究领域:
高分子化学
·
催化化学
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DOI
PubMed
高影响因子
FUEL
·
2022
·
IF 8.035
Yi Liu,Ying Chen,Shuang Ma,Xianlong Liu,Xiangwen Zhang,Ji-Jun Zou,Lun Pan
High-energy–density (HED) fuels have attracted extensive attention for volume-fixed aerospace vehicles because they can provide more propulsion energy to increase the payload and range of aerospace vehicles. Herein, we report a route for synthesis of HED fuel, pentacyclo[8.2.1.1 4,7 .0 2,9 .0 3,8 ]tetradecane (PCTD) with strained structure, by photoinduced intermolecular [2 + 2] cycloaddition of norbornene (NBE). The triplet quenching and phosphorescence quenching results indicate that NBE cycloaddition is conducted through the photosensitized processes containing triplet–triplet energy transfer, cyclization and relaxation. The reaction conditions are optimized to obtain the high photocatalytic activity, with the NBE conversion and PCTD selectivity reaching 78.7% and 94.4%, respectively. Moreover, a kinetic model is proposed with the reaction rate equation being correlated with the incident light flux, with the pseudo reaction kinetics parameters and reaction rate equations obtained. Importantly, PCTD shows high density of 1.024 g/mL and high volumetric net heat of combustion of 42.98 MJ/L, much higher than those of JP-10. In addition, blending with JP-10 or QC can significantly improve cryogenic properties of blended fuels, which is very promising for the practical application.
研究领域:
化学工程
·
能源科学
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DOI
高影响因子
POLYMER
·
2022
·
IF 4.432
Xiong Xiao,Ziwei Huang,Xia Jiang,Yuchu Yang,Liping Yang,Shaojie Yang,Chuan Niu,Yue Xu,Li Feng
Norbornene modified hyaluronic acid (NorHA) has attracted enormous attention in biological research for its ability to form hydrogels in a cell-friendly way. However, traditional routes to synthesis NorHA are involved with laboring and cumbersome steps. In this study, an alternative single-step approach to fabricate NorHA is reported. NorHA was first synthesized by conjugating carbic anhydride (CA) with hyaluronic acid (HA) directly and NorHA with various norbornene substitution degrees (SD) was obtained by adjusting the reaction pH, time, and the amounts of CA easily. Porous NorHA hydrogels were prepared via orthogonal thiol-norbornene reaction under blue light irradiation . Furthermore, the resulting gelation performances, swelling behaviors, and transmittance of NorHA hydrogels were adjusted by varying the content of crosslinker or NorHA. The cytocompatibility evaluation suggests that the obtained NorHA were suitable for cell encapsulation. Finally, we show that this approach also can be extended to other natural or synthesized biopolymers to prepare cytocompatible photo-crosslinked hydrogels.
研究领域:
生物材料
·
生物医学工程
·
高分子化学
·
组织工程
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Chao Wang,Biming Mo,Zhenfeng He,Qian Shao,Duo Pan,Evan Wujick,Jiang Guo,Xinling Xie,Xiaofeng Xie,Zhanhu Guo
A series of crosslinked anion exchange membranes (AEMs) were prepared through ring-opening metathesis polymerization (ROMP) of tetraalkylammonium-functionalized norbornene derivatives. Dimensional stability and mechanical properties were enhanced by the crosslinker of 2, 2′-(hexane-1,6-diyl) bis(2-methyl-2, 3, 3a, 4, 7, 7a-hexahydro-1H-4, 7-methanoisoindol-2-ium) iodide (b3). The thermal stability, ion exchange capacity (IEC), water uptake, swelling ratio, ion conductivity and mechanic property of the membranes were investigated. The molar ratios of monomer (3aR, 4 S, 7 R, 7aS)− 2-methyl-2-(3-(trimethylammonio)propyl)−2, 3, 3a, 4, 7, 7a-hexahydro-1H-4,7-methanoisoindol-2-ium iodide (a3): norbornene: monomer b3 was 1:6:3, 2:6:2, 3:6:1 in AEM-1, AEM-2, AEM-3. The resultant AEM-3 membrane had an IEC of 2.89 mmol g −1 , an ion conductivity of 64.79 mS·cm −1 , a water absorption of 12.5% and a tensile strength of 15.18 MPa at 25 °C. The swelling ratio of AEM-1 (the molar ratio of monomer a3: norbornene: monomer b3 was 1:6:3) was 9.28% at 20 °C and 9.92% at 60 °C. The tensile strength of membranes was improved by the crosslinker. A single cell was built with this AEM-3 membrane and the performance was evaluated. A maximum power density of 152 mW cm −2 at 50 °C was demonstrated. The membranes show great promise to serve as membranes for fuel cells due to excellent performances of higher ion conductivity and better dimensional stability.
研究领域:
材料科学
·
能源科学
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产品关联
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Wei Lang,Gengjinsheng Cheng,Rongpeng Peng,Qian-Yong Cao
A fluorescent poly (norbornene)-based copolymer probe P1 , which was obtained via ring-opening metathesis polymerization (ROMP) of a PEG-anchored norbornene monomer NB-PEG with a rhodamine-functionalized monomer NB-RB, has been designed and synthesized. Owing to its amphiphilic property, copolymer P1 self-assembles nanostructure aggregations in aqueous solution with a weak emission. Upon addition of ATP , visual color change from colorless to red and a large fluorescence enhancement were observed for the ring-opening of rhodamine spirolactam mechanism. This probe shows a good photostability, and has been successfully applied for imaging of ATP level in living SMMC cells.
研究领域:
材料科学
·
分析化学
·
生物医学工程
·
细胞生物学
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产品关联
DOI
高影响因子
BIOMACROMOLECULES
·
2021
·
IF 6.988
Cailing Zhao,Zejia Wu,Hanyu Chu,Tao Wang,Shuai Qiu,Jing Zhou,Qingtang Zhu,Xiaolin Liu,Daping Quan,Ying Bai
Extrusion-based bioprinting is an emerging and most frequently used technique for the fabrication of cell-laden constructs. A suitable hydrogel-based bioink for cell encapsulation and protection is critical for printability, structural stability, and post-printing cell viability. The thiol–ene chemistry-based gelatin-norbornene (GelNB) hydrogels have drawn much attention as a promising substitution of gelatin methacryloyl (GelMA), owing to the fast and controllable step-growth polymerization mechanism, as well as a significant reduction in reactive oxygen species (ROS) accumulation. Herein, thiolated heparin (HepSH) was synthesized and used as a macromolecular crosslinker for GelNB-based bioprinting, so that GelNB gelation became less sensitive to the thiol/ene ratio. The mechanical stability and moduli of GelNB/HepSH hydrogels were easily manipulated by the concentration and/or degree of thiol substitution. The GelNB/HepSH hydrogel allowed little intracellular ROS for encapsulated cells but provided vascular endothelial growth factor binding affinity for potential facilitation of neovascularization. Finally, the GelNB/HepSH bioink enabled a convenient printing process for both complex-structured bioscaffolds and cell-laden constructs, and resulted in good printability and high post-crosslinking cell viability. The crosslinker HepSH may serve as a multifunctional macromolecule that enables GelNB-based bioprinting in broad applications in regenerative medicine.
研究领域:
生物打印
·
再生医学
·
材料科学
·
组织工程
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产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2023
·
IF 4.5
Yanzhu Liu,Ming Tu,Wei Lang,Qing Guo,Yongxiu Li,Qian-Yong Cao
A new amphiphilic polynorbornene-based copolymer P1 was designed and synthesized successfully by ring-opening metathesis polymerization (ROMP) of polyethylene glycol (PEG) containing monomer NB-PEG and ferreocene-anchored monomer NB-Fc . The copolymer P1 can bind with anionic uranine dye ( UD ) through multiple interactions to form no fluorescent P1 / UD nano-structure ensemble in aqueous solution. The P1 / UD ensemble can be used as indicator displacement assay (IDA) for ATP detection with a high sensitivity and selectivity. Upon the addition of ATP, the fluorescence is significant enhanced for displacement of UD from P1 / UD ensemble. The LOD value of P1 / UD ensemble toward ATP is as low as 35.9 nM. The P1 / UD ensemble exhibits an excellent photo-stability and biocompatibility, and has been successfully used for imaging ATP in living cells.
研究领域:
高分子化学
·
分析化学
·
生物医学工程
·
材料科学
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产品关联
DOI
高影响因子
MRS Communications
·
2020
·Vol. 10
·期 3
·487-491
·
IF 1.997
Zhenghui Li,Lu Chen,Peijie Yu,Lingli Zhang,Hongyu Hu
To overcome the steric effect of norbornene (NB), first-generation Grubbs’ catalyst (GC1) was used as the catalyst to graft NB onto the polypropylene (PP) chain by reactive extrusion. Instead of harsh reaction conditions, such as anhydrous, which was the general method to synthesize NB polymers, this convenient method would be easier to industrialize. The mechanism of grafting was studied by using Fourier Transform InfraRed spectra and differential scanning calorimetry. It was found that GC1 could initiate the ring-opening metathesis polymerization of NB to obtain short NB chain-grafted PP-g-NB. The rheological behavior showed that the grafted NB short chains on PP-g-NB increase the shear thinning of the polymers and decrease the system viscosity.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Guangzeng Luo,Zhilu Gao,Cuiping Zhou,Yintan Huang,Shuangshuang Hu,Yifan Hu,Chuanyong Zong,Lan Lei,Hui Li
Well-tailored construction of icephobic surfaces with mechanical robustness and investigation of the structure–property relationships at the molecular level are highly desirable. Herein, a series of norbornene-based fluorinated polyolefin copolymers (FPOR-x) with varying norbornenyl dodecafluoroheptyl ester (NDFHE) molar fractions (0–100 mol %) were well-designed and fabricated via living ring-opening metathesis polymerization (ROMP) employing NDFHE and norbornenyl pentafluorophenyl ester (NPFPE) as the soft and hard segments, respectively. The mechanical and icephobic properties of the fluorinated copolymers can be regulated by adjusting the soft NDFHE contents. As a result, the well-designed norbornene-based copolymers exhibited a wide range of tunable mechanical properties, including tensile strength ranging from 0.2 to 26.4 MPa, elastic modulus ranging from 0.6 to 593.7 MPa, and breaking elongations ranging from 5718.7% to 3.7%, correlating with the proportion of soft NDFHE content. Furthermore, the synergistic interplay between soft and hard segments, particularly the hardness in the majority and softness in the minority or vice versa, could achieve a significant difference in the local modulus and enhance the propagations of cracks within the three-phase regions (soft regions/hard regions/ice), ultimately leading to a significant reduction in ice shear strength. Notably, FPOR-25% with a tensile strength of 12.0 MPa and an elastic modulus of 227.5 MPa exhibited a remarkably low ice shear strength of 57.7 kPa. This study not only highlights the relationship between the polymer molecular structure and surface icephobic properties but also breaks the limitations of icephobic surfaces with a low modulus.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2024
·
IF 4
Lei Zhang,Baicheng Feng,Shibo Pang,Huifen Xin,Kun Li,Yan Jin
Six N‑hydroxy-5-norbornene-2,3-dicarbonylimine sulfonates(3a-3f) were created in this paper and produced as non-ionic photoacid generators (PAGs) in good yields. 1 H NMR and 13 C NMR were used to confirm the structures of the compounds and 19 F NMR was used to further justify the structure of 3a. Thermal Gravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) showed that all six PAGs have good thermal stability. Additionally, the solvent's influence on PAG compounds was examined using Ultraviolet and visible spectrum (UV–vis) and 254 nm fluorescence spectra (FS). The changes in the six PAG components of the products were monitored by HPLC on exposure to UV light (254 nm). An exposure acid production assay based on the spectrophotometric approach was developed using Rhodamine B (RB) as the acid sensor. The degradation and acid production quantum yields of the six PAGs were tested, and the results showed that all PAGs exhibited a high acid-producing capacity. In addition, we present a potential mechanism for the photogeneration of sulfonic acid, and DFT time calculations using Gaussian calculations support the N O bond cleavage mechanism of PAG 3c.
研究领域:
材料科学
·
化学合成
·
光化学
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产品关联
DOI
高影响因子
STAR Protocols
·
2024
·
IF 1.3
Zili Gao,Shenglong Ding,Tingting Fan,Wenhui Huang,Xiyuan Zhao,Xin Liu,Wenli Liu,Mingzhu Zhang,Qi Gu
Summary Here, we present a protocol for 3D printing heart tissues using thiol-norbornene photoclick collagen (NorCol). We describe steps for synthesizing NorCol, preparing bioink and the support bath, and cell-laden printing. We then detail procedures for the loading of C2C12 cells into NorCol, ensuring structural integrity and cell viability after printing. This protocol is adaptable to various cell lines and allows for the printing of diverse complex structures, which can be used in drug screening and disease modeling.
研究领域:
生物医学工程
·
组织工程
·
材料科学
·
细胞生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）