IRANIAN POLYMER JOURNAL
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2017
·Vol. 26
·期 3
·205-211
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IF 1.422
Zhou Min-Jie,He Fang,Wu Hu,Wang Guo-Xiang,Liu Li-Chao,Xu Wenyuan
Fe-mediated photo-induced atom transfer radical polymerization (ATRP) of methyl methacrylate was studied with chlorophyll A as photoredox catalyst in the absence of ligands. This is the first report on photo-induced and FeBr 3 -mediated ATRP. A low-cost and environmentally friendly ATRP is provided in this system. A good linear semi-logarithmic plot of polymerization kinetics is the first-order time conversion, and narrow molecular weight distributions explain the well-controlled behavior. The measured number average molecular weight, M
n,GPC (determined by gel permeation chromatography), is increased with monomer conversion, and it is in good agreement with the theoretical values ( M
n,th ). The effect of FeBr 3 is studied with respect to the polymerization. The values of the resultant PMMA increased with reduced FeBr 3 concentration. In this system, the effect of periodic light/off process has been investigated through chain growth instantly turned on and off in response to the visible light. The polymerization was controllable even though the concentration of Fe-based catalyst was dropped to 4 ppm. The chain-end group having a functionality in the synthesized poly(methyl methacrylate) was characterized by nuclear magnetic resonance spectrometry ( 1 H NMR). However, chain extension experiments show reserved chain-end functionality in the synthesized polymers and further confirm the “living” feature of the Fe-mediated photo-induced atom transfer radical polymerization.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CELLULOSE
·
2019
·Vol. 27
·期 2
·743-753
·
IF 3.917
Chen Junyu,Mao Liucheng,Qi Hongxu,Xu Dazhuang,Huang Hongye,Liu Meiying,Wen Yuanqing,Deng Fengjie,Zhang Xiaoyong,Wei Yen
Abstract In recent years, cellulose nanocrystal (CNC) based materials have attracted great research attention for different applications owing to their unique properties and facile modification chemistry. In this work, CNC based thermo-responsive fluorescent composites were successfully prepared via the metal-free surface-initiated atom transfer radical polymerization (ATRP) of NIPAAm and a Schiff base containing dye (HDPAP). Results demonstrated CNC-poly (NIPAAm–HDPAP) composites display sensitive temperature-responsive coil-to-globule transition behavior at the temperature of lower critical solution temperature. The bright fluorescence offered by the Schiff base dye (HDPAP) was also confirmed by fluorescence spectra. Moreover, the preparation method of light meditated ATRP was proved to become the promising way in fabrication of multifunctional nanomaterials for its incomparable advantages, including low energy consumption, high efficiency, good monomer adaptation, free of transition metal ions. Graphic abstract
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Junyu Chen,Meiying Liu,Qiang Huang,Ruming Jiang,Hongye Huang,Fengjie Deng,Yuanqing Wen,Jianwen Tian,Xiaoyong Zhang,Yen Wei
Carbon-based fluorescent nanoparticles are considered to be new promising nontoxic fluorescence probes which suitable for various bioimaging and biomedical applications. However, the synthesis and production of such high-quality fluorescent carbon-based nanoparticles is still challenging, and its most application potential is unexplored. In this work, we introduce a facile light-induced surface-initiated atomic transfer radical polymerization (SI-ATRP) method to fabricate the nanodiamonds (NDs) based fluorescence probes in the absence of transition metal ligands. In this sample way, the Fluorescein was employed and played the role as the fluorescent signal and photocatalyst simultaneously for its photochemical property. Besides, the poor dispersibility of pristine NDs was also obviously improved by modifying with PEGMA , and the modified NDs (FNDs-polyPEGMA) display good dispersion and biocompatibility via characterization methods. A series of characterization techniques were also carried out to confirm the successful fabrication of fluorescent NDs after polymerization. Through our investigation, the as prepared FNDs-polyPEGMA nanoparticles with high dispersibility and stable green fluorescence could be the potentially used fluorescent probes in biomedical application.
研究领域:
材料科学
·
生物医学工程
·
化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Xiaoguang Qiao,Qianqian Hao,Meng Chen,Ge Shi,Yanjie He,Xinchang Pang
The utilizing light with broadband range has attracted lots of research interest for the photo induced reversible-deactivation radical polymerization (RDRP). However, it is still a challenge for a single catalyst to simultaneously respond to various lights with highly varied wavelengths. Here, we proposed a simple strategy for the preparation of a heterogeneous photocatalyst suitable for photo induced atom transfer radical polymerization (photoATRP) under full spectrum (from UV/vis light to NIR), by combining pyridine nitrogen doped carbon dots (N-CDs) and upconversion nanoparticles (UCNPs). In the presence of these robust UCNP@SiO2@N-CDs composite particles, the photoATRP could be carried on under the different irradiations of UV, blue, green, red, white, and 980 nm NIR light, with a low loading of part per million concentrations of the CuBr2/L catalyst. Moreover, the excellent solvent and aqueous compatibility allow UCNP@SiO2@N-CDs to be capable for photoATRP in both organic solvents and aqueous media, providing well-defined hydrophobic and hydrophilic polymers with low dispersity and excellent chain-end fidelity. In addition, the photoATRP with 980 nm NIR exhibited excellent penetrations through visible-light-proof barriers. The system could be used for the preparation of an injectable hydrogel that had dual curing and photoluminescence modes. Owing to the “living” characteristics of polymer chains achieved through ATRP, the hydrogel was capable to be easily repaired by using monomer as the binder.
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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生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 7
·45863
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IF 1.86
Yue Sun,Juan Li,Mengyuan Zhao,Yutong Liu,Jiameng Zhang,Chengwei Lv
Polyacrylamide- b -poly(methacrylic acid) was prepared on the surface of Au electrode (Au/PAM/PMAA) for Pb 2+ ion electrochemical sensing via metal-free visible-light-induced atom transfer radical polymerization, which was very simple, convenient, and environmentally friendly. Au/PAM/PMAA was carefully examined by cyclic voltammetry, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. Further, Au/PAM/PMAA was successfully used for the determination of Pb 2+ ion by differential pulse anodic stripping voltammetry. Under the optimal conditions, a linear response from 1.0 × 10 −11 to 1.0 × 10 −4 mol/L with detection limit of 2.5 × 10 −12 mol/L ( S / N = 3) was achieved from the results of experiments. Comparing with similar Pb 2+ sensors, the broader linear range and lower detection limit suggested the promising prospect of Au/PAM/PMAA. In a word, the work of this article had an important significance for the polymer-modified electrodes and the sensitive detection of Pb 2+ . © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45863.
研究领域:
材料科学
·
环境科学
·
分析化学
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DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Long Huang,Meiying Liu,Liucheng Mao,Dazhuang Xu,Qing Wan,Guangjian Zeng,Yingge Shi,Yuanqing Wen,Xiaoyong Zhang,Yen Wei
The mesoporous materials with large pore size, high specific surface area and high thermal stability have been widely utilized in a variety of fields ranging from environmental remediation to separation and biomedicine. However, surface modification of these silica nanomaterials is required to endow novel properties and achieve better performance for most of these applications. In this work, a new method has been established for surface modification of mesoporous silica nanoparticles (MSNs) that relied on the visible light induced atom transfer radical polymerization (ATRP). In the procedure, the copolymers composited with itaconic acid (IA) and poly(ethylene glycol)methyl acrylate (PEGMA) were grafted from MSNs using IA and PEGMA as the monomers and 10-Phenylphenothiazine(PTH) as the organic catalyst. The successful preparation of final polymer nanocomposites (named as MSNs-NH 2 -poly(IA- co -PEGMA)) were evidenced by a series of characterization techniques. More importantly, the anticancer agent cisplatin can be effectively loaded on MSNs-NH 2 -poly(IA- co -PEGMA) and controlled release it from the drug-loading composites with pH responsive behavior. As compared with conventional ATRP, the light induced surface-initiated ATRP could also be utilized for preparation of various silica polymer nanocomposites under rather benign conditions (e.g. absent of transition metal ions, low polymerization temperature and short polymerization time). Taken together, we have developed a rather promising strategy method for fabrication of multifunctional MSNs-NH 2 -poly(IA- co- PEGMA) with great potential for biomedical applications.
研究领域:
材料科学
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纳米技术
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生物医学工程
·
化学
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产品关联
DOI
高影响因子
IRANIAN POLYMER JOURNAL
·
2018
·Vol. 27
·期 11
·881-887
·
IF 1.278
Zeng Le-Lin,Xie Wan-Yun,Yang Cai-Xia,Liang Enxiang,Wang Guo-Xiang
In this study, a novel photocatalyst, pentarylenebis(dicarboximide) dye: (1,6,13,18-tetra(4-(2,3,3-trimethylbut-2-yl)phenoxy)- N,N ’-(2,6-diisopropylphenyl)-pentarylene-3,4,15,16-tetracarboxidiimide) (TTPDPT), was first used in metal-free photoinduced atom transfer radical polymerization (ATRP) of methyl methacrylates (MMA). The initiator was methyl α-bromoisobutyrate (MBI) and the light source was mild near-infrared (NIR) light irradiation ( λ max ≈ 870 nm). The TTPDPT-mediated ATRP relies on in situ photoreduction of a MBI through an electron transfer process to generate the desired alkyl radical, which could induce polymerization of the monomer. The photoinduced metal-free ATRP of MMA shows typical characteristics of controlled free radical polymerization, showing the linear evolution of number-average molecular weight ( M n,GPC ) with monomer conversion, where polymers with predetermined degree of polymerization have well-controlled molecular weights and narrow molecular weight distribution ( M w / M n ). The photoinduced metal-free ATRP of MMA can be carried out with just ppm level of TTPDPT. The polymerization initiation and propagation can be operated by the aid of pulsed light sequences while NIR light source was used to promote carbon–carbon bond formation and to produce poly(methyl methacrylate) (PMMA) with M w / M n as low as 1.5. The synthesized PMMA was characterized by 1 H nuclear magnetic resonance ( 1 H NMR). The resultant PMMA contained a bromide end group that can be employed to reinitiate styrene polymerization to produce block copolymers through chain extension experiments.
研究领域:
高分子化学
·
材料科学
·
光化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）