CHINESE JOURNAL OF POLYMER SCIENCE
·
2013
·Vol. 31
·期 12
·1613-1622
·
IF 1.27
Zhang Fei-jun,Liu Xiao-hui
Initiators for continuous activator regeneration atom transfer radical polymerization (ICAR ATRP) of acrylonitrile was first conducted at various ambient temperatures (30–45 °C). The key to success is ascribed to the usage of an appropriate low temperature radical initiator (2,2′-azobis(2,4-dimethylvaleronitrile)) and a high reactivity catalytic system (CuBr 2 /Me 6 TREN). The molar ratio of Cu catalyst to AN as low as 1:20000 was used to prepare well-defined polyacrylonitrile with controlled molecular weight and a narrow polydispersity index range of 1.08–1.30, while the monomer conversion was up to ca . 98%. The apparent activation energy of the polymerization was calculated to be 128.45 kJ/mol, suggesting that the polymerization strongly depended on reaction temperature. The very high chain-end functionality of the resultant polymer was confirmed by 1 H-NMR and GPC analyses as well as chain extension reaction.
研究领域:
高分子化学
·
材料科学
·
自由基聚合
·
高分子工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2018
·
IF 3.235
Qianrui Liu,Kefeng Ma,Dongxiao Wen,Qiangwei Wang,Haobo Sun,Qingyun Liu,Jinming Kong
In this work, a biosensor for ultrasensitive detection of glucose via electrochemically mediated atom transfer radical polymerization (eATRP) was firstly reported in the field of biosensing analysis. Firstly, 4-mercaptophenylboronic acid was immobilized onto Au electrode surface via Au S bond to recognize glucose by producing 5-membered cyclic boronic ester. Then initiators of atom transfer radical polymerization were introduced to the electrode surface by the reaction between 2-bromoisobutyryl bromide and the remaining hydroxyl groups of glucose to produce the alkyl halide initiation site. The monomer began to graft onto the electrode surface, and an electrochemical potential was applied to activate the copper catalyst for the formation of polymeric chains which were labeled numerous electroactive probes ferrocene . The square wave voltammetry was applied to monitor electrochemical signal of quantitatively labeled ferrocene. Under optimal conditions, this strategy for ultrasensitive detection of glucose presented a good linear relationship between oxidation current of ferrocene and logarithm of glucose concentrations in the range from 1.0 nM to 10 μM with an extremely low limit of detection of 0.32 nM (R 2 = 0.996). In addition, this strategy showed good specificity for glucose detection in physiological conditions and also showed high reliability in human serum.
研究领域:
生物传感
·
分析化学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Processes
·
2021
·Vol. 9
·期 9
·1638
·
IF 2.847
Yonggang Ma,Xin Chen,Dehui Han,Zhe Zhao,Wenting Lu
A CO2-responsive composite of multiwall carbon nanotube (MWCNT) coated with polydopamine (PDA) and polydimethylamino-ethyl methacrylate (PDMAEMA) was prepared. The PDA was first self-polymerized on the surface of carbon nanotube. 2-bromoisobutyryl bromide (BiBB) was then immobilized by PDA and then initiated the ATRP of DMAEMA on the carbon nanotube surface. The resulting composite was characterized by Fourier-transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The CO2-responsive test was performed by bubbling CO2into the mixture of MWCNT-PDA-PDMAEMA composite in water. A well-dispersed solution was obtained and the UV-Vis transmittance decreased dramatically. This is attributed to the reaction between PDMAEMA and CO2. The formation of ammonium bicarbonates on the surface of carbon nanotubes leads to the separation of nanotube bundles. This process can be reversed as the removal of CO2by bubbling N2.Keywords:CO2-responsive;polymer;multiwall carbon nanotube (MWCNT);composite;ATRP
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2012
·Vol. 19
·期 10
·1-7
·
IF 1.733
Chen Han Jia,Yan Tao,Shi Xu Hua,Yu Ri Wen
Cyclic polystyrene and poly(methyl methacrylate) with narrow molecular weight distribution were synthesized conveniently by intra-molecular cyclization of α-carboxyl-ω-chloride hetero-telechelic polystyrene and poly(methyl methacrylate) using potassium carbonate as the catalyst in highly dilute solution, respectively. The linear precursors were prepared successfully by atom transfer radical polymerization (ATRP) using 4-(chloromethyl)benzoic acid as an initiator. The chemical structures and molecular weights of the synthesized polymers were systematically characterized by nuclear magnetic resonance spectrum ( 1 H-NMR), Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). The results revealed that high purity cyclic polymers were synthesized via a combination of intra-molecular cyclization and ATRP, and isolated easily by column chromatography on silica gel using a mixture of petroleum ether /ethyl acetate as an eluant.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Shufang Wu,Yushu Zhang,Zhiquan Li,Xiaoxuan Liu,Yusuf Yagci
A metal-free approach to visible-light LED-induced atom transfer radical polymerization (ATRP) using oligopyrene as a photocatalyst is reported. The method facilitates the polymerization of various vinyl monomers, yielding polymers with molecular weight distribution as low as 1.32 and controlled chain-end functionality. Light on/off experiments demonstrate the light-dependent nature of the polymerization, confirming the effectiveness of the oligopyrene/alkyl halide system. The presented strategy paves the way for future advancements in polymer science, offering a metal-free alternative for controlled polymerization under visible light irradiation.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 7
·1228
·
IF 3.164
Chun-Na Yan,Lin Xu,Qing-Di Liu,Wei Zhang,Rui Jia,Cheng-Zhi Liu,Shuang-Shuang Wang,Li-Ping Wang,Guang Li
Well-defined polymer brushes attached to nanoparticles offer an elegant opportunity for surface modification because of their excellent mechanical stability, functional versatility, high graft density as well as controllability of surface properties. This study aimed to prepare hybrid materials with good dispersion in different solvents, and to endow this material with certain fluorescence characteristics. Well-defined diblock copolymers poly (styrene)-b-poly (hydroxyethyl methyl acrylate)–co-poly (hydroxyethyl methyl acrylate- rhodamine B) grafted silica nanoparticles (SNPs-g-PS-b-PHEMA-co-PHEMA-RhB) hybrid materials were synthesized via surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (SI-ARGET ATRP). The SNPs surfaces were modified by 3-aminopropyltriethoxysilane (KH-550) firstly, then the initiators 2-Bromoisobutyryl bromide (BIBB) was attached to SNPs surfaces through the esterification of acyl bromide groups and amidogen groups. The synthetic initiators (SNPs-Br) were further used for the SI-ARGET ATRP of styrene (St), hydroxyethyl methyl acrylate (HEMA) and hydroxyethyl methyl acrylate-rhodamine B (HEMA-RhB). The results indicated that the SI-ARGET ATRP initiator had been immobilized onto SNPs surfaces, the Br atom have located at the end of the main polymer chains, and the polymerization process possessed the characteristic of controlled/“living” polymerization. The SNPs-g-PS-b-PHEMA-co-PHEMA-RhB hybrid materials show good fluorescence performance and good dispersion in water and EtOH but aggregated in THF. This study demonstrates that the SI-ARGET ATRP provided a unique way to tune the polymer brushes structure on silica nanoparticles surface and further broaden the application of SI-ARGET ATRP.Keywords:dispersibility;rhodamine B;SI-ARGET ATRP;silica nanoparticles
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 5
·1496-1502
·
IF 1.637
Qu Dezhi,Bai Yongping,Li Ning
The atom transfer radical polymerization (ATRP) of methyl methacrylate using CuCl and various ligands catalytic system with 1-bromomethyl-carborane was investigated. Due to the aromaticity of carborane casued by the electron delocalization boron cage, carborane can be used as initiator. To determined the optimal conditions for this ATRP reaction, we studied the influences of different solvents, ratios of monomer to initiator and ratios of catalyst to ligand for polymerization, and finally determined the optimal condition for this ATRP reaction. Under the optimal condition, the polymer will show a very narrow molecular weight distribution (polydispersity index (PDI) = 1.17, measured by GPC). The apparent reaction rates of polymerization were well controlled with a linear increase and monomer conversion reached up to 94%.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2022
·Vol. 60
·期 10
·1571-1587
·
IF 3.046
Haicun Yang,Shuipi Cai,Yu Jiang,Zheng Cao,Wenzhong Ma,Fanghong Gong,Guoliang Tao,Chunlin Liu
The commonly used multi-center initiation methods always lead to the formation of quantities of homopolymer in the surface tailoring based on reverse atom transfer radical polymerization (ATRP) and reversible addition-fragmentation chain-transfer (RAFT) polymerization. In this study, a monocenter redox pair constructed of silica bearing tert-butyl hydroperoxide groups and ascorbic acid (SiO 2 -TBHP/AsAc) was applied to substitute the commonly used initiation method of R-supported RAFT grafting polymerization. All the propagating radicals were restricted on the surface of solid particles during the whole procedure theoretically, resulting in a higher grafting efficiency of 95.1% combined with the “controllable” feature at 10 h. This redox pair was also used to initiate the reverse ATRP in miniemulsion successfully with a grafting efficiency of 86.3% at 10 h. The grafting efficiency obtained under this monocenter initiation method was significantly higher than that of the frequently reported surface modification by reverse ATRP and RAFT polymerization. In addition, the high-efficient surface tailoring was traced and confirmed by nuclear magnetic resonance, Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis, transmission electron microscopy, and other analysis tests. The advantage of this monocenter redox pair will open a new avenue for the potential “high-efficient” surface tailoring of various materials. Graphical
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2011
·
IF 3.673
Zhuan Yi,Li-Ping Zhu,You-Yi Xu,Xiao-Na Gong,Bao-Ku Zhu
A facile method to endow porous membranes with high coverage of zwitterionic components on surface was described. The amphiphilic precursor poly(vinylidene fluoride)- graft - N , N -dimethyl aminoethyl methacrylate (PVDF- g -PDMAEMA) was firstly synthesized via ATRP method and then blended with PVDF to prepare flat membranes. The 3-bromopropionic and 1,3-propane sultone were then used as quaternization agent to transit the PDMAEMA into poly(zwitterions) through an surface reaction by treating membranes under a mild condition. The reaction kinetics was investigated, finding that 1,3-propane sultone was more reactive than the 3-bromopropionic. The X-ray photoelectron spectroscopy (XPS) confirmed that nearly 70% of PDMAEMA had been quaternized in 48 h for the 1,3-propane sultone, while only 62% of PDMAEMA was transited for the 3-bromopropionic in 96 h. The porosity determination indicated that the specific area had decreased obviously after the membranes being modified. Morphology changes were found to be responsible for the decreased water fluxes and increased retentions when zwitterions were formed. The successful modification was confirmed by the nice biocompatibility that no platelets adhesion as well as proteins deposition was observed on modified membranes.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2017
·
IF 1.591
Xianwu Jing,Zhiyu Huang,Hongsheng Lu,Baogang Wang
A four-armed anionic star-shaped block polymer, containing an anionic polymer poly(2-Acrylamido-2-methylpropanesulfonic acid) (PAMPS) as the core group and poly(2-(Dimethylamino)ethyl methacrylate) (PDM) as the terminal group, was synthesized by using the Atom Transfer Radical Polymerization (ATRP) method. The (PAMPS50-PDM50)4 aqueous solution exhibited both polyelectrolyte and hydrophobic associative characteristics, that is, a low concentration of NaCl results in decreasing viscosity but a high concentration of NaCl results in increasing viscosity. The four-armed anionic block polymer shows a CO2-reversible property at high concentrations of brine. Viscosity, pH, and ζ potential demonstrate the switchability jointly; the values could be switched from relatively low to high cyclically. These transitions could actually be attributed to the protonation of tertiary amine groups in PDM blocks, and the mechanism was proved by 1H NMR.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 8
·4226-4236
·
IF 3.108
Youning Chen,Wei Zhao,Juncai Zhang
The study focused on the preparation of a chelating resin with pyridine ring as the functional group. The 4VP monomer was directly grafted on the surface of CMPS resin via SI-ATRP, and the performance of adsorption of resin for Cr(VI), Pb(II), Cr(III), Zn(II), and Cd(II) was determined. With the extension of ATRP time and increase of 4VP consumption, the 4VP grafting rate was linearly increased, indicating an increase in the density of the pyridine ring on the resin surface. Adsorption experiments indicated that the adsorption capacity of the resin for the metal ions considerably improved when compared with that of those reported in literature, whereas the desorption rate and reusability were equivalent to those of the conventional resins. When the pH value was greater than 5.0, Pb(II), Cr(III), Zn(II), and Cd(II) ions could be adsorbed; however, when the pH value was less than 3.0, Cr(VI) could be selectively adsorbed. These results are indicative of a potential application of the resin in the treatment of heavy metal wastewater. Therefore, adoption of one-step SI-ATRP is one of the effective methods for preparing a chelating resin with high capacity via the selection of an appropriate functional monomer.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER BULLETIN
·
2018
·Vol. 76
·期 3
·1081-1097
·
IF 1.589
Chen Youning,Zhao Wei,Yang Xiaoling,Li Yuhong
Using SI-ATRP technique, 1-vinylimidazole (VI) monomer was directly modified onto the surface of CMPS resin to prepare a chelating resin (PVI-g-PS) with imidazole ring as functional group. The adsorption properties of Cd(II), Ni(II), Pb(II) and Cu(II) were studied. It was found that with the increase in ATRP time and the amount of VIM, the graft ratio of VIM increased linearly, which indicated that the density of imidazole ring on the surface of resin increased. Adsorption experiments showed that the resin has good adsorption properties for Cd(II), Ni(II), Pb(II) and Cu(II). At pH 5.0, the static saturated adsorption amount of PVIM-g-PS for Cd(II), Ni(II), Pb(II) and Cu(II) was 2.82, 1.77, 1.22 and 0.83 mmol g −1 , respectively. The adsorption model could be described by Langmuir isothermal adsorption and the adsorption process accorded with quasi-first-order kinetic equation. In addition, the resin has good desorption rate and reusability. These findings suggest that the resin can be potentially applied to the efficient removal of heavy metal ions from wastewater.
研究领域:
环境科学
·
材料科学
✓ 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）