JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2017
·Vol. 55
·期 13
·2211-2220
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IF 2.952
Yuchen Feng,Suyun Jie,Bo-Geng Li
Fatty acid-derived cyclooctenes, including n -hexanoic acid ( M1 ), n -octanoic acid ( M2 ), lauric acid ( M3 ), and palmitic acid ( M4 ), were prepared as monomers and polymerized by ring-opening metathesis polymerization (ROMP) using Grubbs second-generation catalyst ( G2 ). In all the cases, the regio-irregular unsaturated polymers with pendent linear branches were obtained, which could be saturated by chemical hydrogenation with TSH/TPA in high conversion, yielding ethylene/vinyl ester copolymers with pendent linear branches on precisely every eighth backbone carbon. Both unsaturated and saturated polymers were amorphous, and their structures were characterized by FTIR, 1 H and 13 C NMR spectra, and elemental analysis. Differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) were used to study their thermal properties. The chain length of branches greatly affected the thermal properties of polymers. After hydrogenation, the thermal degradation stability of polymers was relatively improved. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2017 , 55 , 2211–2220
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
高影响因子
LANGMUIR
·
2026
·
IF 3.9
Lifen Xiao,Jiahao Liao,Geng Huang,Jie Li,Wei Li
Developing novel formaldehyde-free wood adhesives with high bonding strength and stability is significant for the environment and for human health. This research developed a series of novel alcohol-based adhesives with different amounts of hydroxyl groups per repeat unit through ring opening metathesis polymerization (ROMP). P2OH exhibited a higher bonding strength than POH and P4OH owing to the strong adhesion and cohesion. In addition, the relationship between bonding strength and molecular weight was also investigated. Taking into account the chain entanglement and fluidity, P2OH500 achieved a highest bonding strength of 5.3 MPa in bonding wood sheets, which was capable of hanging a total weight of 11 kg. Furthermore, P2OH500 exhibited excellent solvent resistance, especially in hot water. The wood sheets retained more than 88% of the original bonding strength after soaking in water at 94 °C for 12 h. It is highly anticipated that this research will provide a new insight into designing formaldehyde-free adhesives with outstanding adhesion performances and excellent water resistance.
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DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2024
·Vol. 62
·期 13
·3038-3046
·
IF 3.9
Linzhi Xie,Yunfeng Zhou,Xiaoming Zhu,Geng Huang,Lifen Xiao,Wei Li
Ring opening metathesis polymerization (ROMP) is widely used to prepare functional materials with various topological structures. However, it is difficult to prepare polymers with ultra-high molecular weight (UHMW) directly. We found a new method to prepare UHMW polymers by combining ROMP and acyclic metathesis reaction. First, monomer NB-2OH was polymerized by ROMP with different feed ratio of NB-2OH/G3, and obtained well-defined polymers P(NB-2OH) n ( n = 50, 200, and 463). Then acyclic metathesis reaction was used to synthesize UHMW polymers. The results indicated that polymer P(NB-2OH) z with higher molecular weight ( M w = 6067.3 kg mol −1 ) and narrower distribution (PDI = 1.58) could be obtained at 80°C for 5 min, when P(NB-2OH) 463 was used as raw material with H 2 SO 4 /G3 = 10/1. Compared with polymer P(NB-2OH)1990 ( M w = 5343.1 kg mol −1 , PDI = 1.61) prepared by ROMP directly, the new method tremendously shortens reaction time, lowers the requirement for the purity of monomer and produces UHMW polymers with narrower distribution. The compositions of prepared polymers were also confirmed clearly by post-modification and 1 H NMR characterization. Graphical
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
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
✓ 已验证
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
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分析化学
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生物医学工程
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细胞生物学
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Xuhui Liang,Yuping Liu,Zhen Dong,Nanting Qiu,Fuwei Kong,Kun Cao,Zhong-Ren Chen
Mild reaction conditions and excellent functional group tolerance make ring-opening metathesis polymerization (ROMP) a widely used technique to synthesize functional materials. In this work, we used ROMP and atom transfer radical polymerization (ATRP) to prepare a reduction-sensitive brush-arm star polymer (BASP) drug carrier by a one-pot method and further conducted in vitro studies. First, a bifunctional norbornene-based ATRP initiator NB-Br and a reduction-sensitive dinorbornene cross-linker (DNC) were synthesized. Subsequently, NB-Br was subjected to ATRP using the hydrophilic monomer oligoethylene glycol monomethyl ether methacrylate (OEGMA) at different polymerization times to obtain the norbornenyl macromonomer NB-P(OEGMA)n with different degrees of polymerization. In the same reaction flask, NB-P(OEGMA)n underwent an ROMP reaction to generate a brush-shaped polymer. Next, DNC was added to the reaction flask, and the reaction was continued to obtain BASP. This one-pot method could successfully be used to achieve the transformation of the macromonomer to the brush-shaped polymer and subsequently to the star polymer. In vitro biological experiments demonstrated that BASP micelles exhibited reduction-triggered cleavage of disulfide bonds and degradation of polymers after coculture with 10 mM glutathione, promoting the release of intracellular doxorubicin and achieving the controlled release of drugs. We expect the findings of our study to serve as an efficient synthetic strategy to prepare carriers for biomedical applications.
研究领域:
材料科学
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高分子化学
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药学
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生物医学工程
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DOI
高影响因子
Polymer Chemistry
·
2023
·Vol. 14
·期 18
·2238-2245
·
IF 4.6
Shengqi Ji,Xiaoyan Yuan,Qianjin Guo,Lixia Ren
Self-assembly is a universal method to prepare block copolymers with ordered structures, which is very important in organic magnets to align the magnetic centres to enhance ferromagnetic interaction. The amphiphilic magnetic polymers (PTMTBDI[FeCl4]) with para-terphenyl group in the cations and high spin FeCl4− as single spin carrier are prepared by ring-opening metathesis polymerization (ROMP) and post-modification. Due to the strong π–π stacking interaction between terphenyl groups, magnetic polymers are self-assembled into macromolecular mono-layer structures with hydrophilic FeCl4− on the two sides and the polymer main chain and side group in the middle in aqueous solution. Fe(III) atoms are arranged in lattice fringe with domain spacing of ca. 2.6 Å. Magnetic property studies show that the polymers are changed from paramagnetic to ferromagnetic with hysteresis loops after self-assembly. The ferromagnetic interaction is induced by the close packing and ordered alignment of the Fe(III) atoms. This work unveils a new method to generate ordered structures in angstrom periodicity and thus improve ferromagnetic interaction in organic magnets.
研究领域:
材料科学
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高分子化学
·
磁学
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产品关联
DOI
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
RSC Advances
·
2024
·Vol. 14
·期 6
·3748-3756
·
IF 3.9
BangSen Li,Wenya Zhu,Jinrui Liu,Shishu Sun,Yan Zhang,DaShuai Zhang,Chen Li,Jianjun Shi,Zaifeng Shi
A practical “grafting-from” strategy is described to grow photochromic polymer brushes bearing spiropyran (SP) functional groups on graphene oxide (GO) surfaces via surface-initiated ring-opening metathesis polymerization (SI-ROMP). The Grubbs II catalyst was fixed on the GO surface, and the norbornene derivatives functionalized using spiropyran were synthesized from this active site via the ROMP method. The results indicated that the spiropyran-modified polymer brushes were obtained on the GO surface in the form of thin films. The solubility of GO modified by spiropyran polymers (GO-SPs) in organic solvents was significantly improved. The GO-SPs exhibited excellent photochromic properties, including fast coloration/decoloration. The modified GO with an isomeric structure was colored in 90 s under ultraviolet irradiation and decolored in 360 s under white light. The fading kinetic rate in the dark was slow and the kinetic attenuation curve followed bi-exponential decay. The GO-SP composite materials took more than 2 h to return to thermodynamically stable forms. The reversible change in the water contact angle reached 8° after continuous cycling with ultraviolet and visible light. GO-SP maintained its photochromic performance and possessed excellent fatigue resistance after more than six successive UV/light cycles. This work describes a practical strategy for the preparation of photochromic polymer brush modified GO composite materials and extends the applications of GO in photochromic materials.
研究领域:
材料科学
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聚合物化学
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纳米技术
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光化学
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DOI
PubMed
高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 6
·1-12
·
IF 5.3
Xue Jinyan,Jia Yuzhen,Qi Linying,Yang Huaixia,Wang Yanzhi,Guo Liang
A novel aptamer-based sensor was developed using the signal amplification strategy of ring-opening metathesis polymerization (ROMP) and polyethyleneimine modified graphene oxide to achieve trace detection of carbendazim (CBZ). The dual identification of aptamer and antibody was used to avoid false positive results and improve the selectivity. Polyethyleneimine modified graphene oxide (GO-PEI), as a substrate material with excellent conductivity, was modified on the surface of a glassy carbon electrode (GCE) to increase the grafting amount of aptamer on the electrode surface. Moreover, a large number of cyclopentenyl ferrocene (CFc) was aggregated to form long polymer chains through ring-opening metathesis polymerization (ROMP), so as to significantly improve the detection sensitivity of the biosensor. The linear range of this sensor was 1 pg/mL–100 ng/mL with a detection limit as low as 7.80 fg/mL. The sensor exhibited excellent reproducibility and stability, and also achieved satisfactory results in actual sample detection. The design principle of such a sensor could provide innovative ideas for sensors in the detection of other types of targets. Graphical abstract
研究领域:
分析化学
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电化学
·
生物传感器
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环境科学
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材料科学
✓ 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）