Polymer Chemistry
·
2016
·Vol. 7
·期 7
·1468-1474
·
IF 5.687
Ze Zhang,Zi-Bin Tan,Chun-Yan Hong,De-Cheng Wu,Ye-Zi You
Reactions combining two or more multicomponent reactions performed sequentially in a single pot have attracted great interest due to the fact that they enable more step- and time economic conversions of simple starting materials into complex targets. However, so far, no such reaction has been applied in the synthesis of topologically different polymers. Here, we first report a novel strategy combining the sequential multicomponent reaction (MCR) of a primary amine, a thiolactone and an alkene and the multicomponent polymerization (MCP) of an azide, an alkyne and a secondary amine in one-pot for the syntheses of topologically different polymers (linear, hyperbranched, core–shell polymers). This strategy provides an effective method that can control the sequence and topology of the obtained polymers simultaneously.
研究领域:
化学
·
材料科学
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DOI
高影响因子
Polymers
·
2019
·Vol. 11
·期 8
·1290
·
IF 3.164
Wu-xing Zhao,Chao Zhou,Hong-shang Peng
A collection of luminescent metal complexes have been widely used as oxygen probes in the biomedical field. However, single intensity-based detection approach usually suffered from errors caused by the signal heterogeneity or fluctuation of the optoelectronic system. In this work, respective ruthenium (II) and terbium (III) complexes were chosen to coordinate a bipyridine-branched copolymer, so that to produce oxygen-sensitive metallopolymer (Ru-Poly) and oxygen-insensitive metallopolymer (Tb-Poly). Based on the hydrophobic Ru-Poly and Tb-Poly, a ratiometric luminescent oxygen nanoprobe was facilely prepared by a nanoprecipitation method. The nanoprobes have a typical size of ~100 nm in aqueous solution, exhibiting a green-red dual-wavelength emission under the excitation of 300 nm and 460 nm, respectively. The red emission is strongly quenched by dissolved oxygen while the green one is rather stable, and the ratiometric luminescence was well fitted by a linear Stern–Volmer equation. Using the ratiometric biocompatible nanoprobes, the distribution of intracellular oxygen within three-dimensional multi-cellular tumor spheroids was successfully imaged.Keywords:Tb-containing polymer;Ru-containing polymer;ratiometric luminescence;nanoprobe;oxygen
研究领域:
生物医学工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2022
·Vol. 13
·期 35
·5073-5081
·
IF 5.364
Ming Liu,Sisi Chen,Xiaofang Lin,Hanliang He,Jie Gao,Yonghua Zhai,Yan Wu,Jian Zhu,Xiangqiang Pan
The design and synthesis of selenium-containing polymers with multiple topological structures and functions for smart materials have always been fascinating in the field of polymer synthesis. In this work, diselenide–yne chemistry for selenium-containing linear polymer modification was established. Many types of diselenide-containing linear polymers were used as versatile platforms for this chemistry. Diverse functional groups could be installed into the polymer backbone and side chains. The degree of functionalization could be controlled and reached up to 98%. After post modification, the polymers also exhibited a sensitive oxidative response. Moreover, selenium-containing polymer brushes with diverse functions could be constructed by the “grafting from” strategy, and the side chain lengths could be tuned easily by controlling the degree of polymerization. To our delight, the brush polymer (EGIn-g-PDMAEMA) showed potential for application in gene transfection. In short, we introduced different functional groups and functional chain segments into selenium-containing polymers through diselenide–yne chemistry, which enriches the topological structures and functions of selenium-containing polymers.
研究领域:
聚合物化学
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材料科学
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生物材料
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DOI
高影响因子
ORGANIC & BIOMOLECULAR CHEMISTRY
·
2017
·Vol. 15
·期 22
·4859-4866
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IF 3.564
Keyuan Liu,Ganhong Du,Mengna Zhao,Long Ye,Huifang Shen,Liming Jiang
A novel optically active methacrylic polymer with an amide-linked acrylate appendage as a chemosensor was synthesized by atom transfer radical polymerization (ATRP) followed by post-modification through a bottom-up design. The sensing behavior of the polymeric probe to various α-amino acids has been investigated through fluorescence, absorption, circular dichroism (CD), and visual color changes at physiological pH. It was found that the sensor exhibits specificity for the fluorescent recognition of cysteine against other amino acids and thiols in a turn-on mode, being significantly more effective than the corresponding small molecule counterpart. The detection limit was estimated to be in the micromolar range. In addition, the use of this chiral polymer allows the selective discrimination of cysteine enantiomers based on either fluorescence or CD spectral responses. Interestingly, the cysteine assay could also be visualized by the naked eye in the presence of small amounts of ferric ions.
研究领域:
生物化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Yong Du,Jingyao Gao,Tingting Chen,Chao Zhang,Jian Ji,Zhi-Kang Xu
Poly(oligoethylene glycol methacrylate) (POEGMA) and zwitterionic polymer brushes have been widely used for constructing biocompatible or antifouling surfaces, and their oxidative stability is very important to the practical application. Herein, POEGMA, poly(sulfobetaine methacrylate) (PSBMA), poly(2-(methacryloyloxy)ethyl phosphorylcholine) (PMPC), and poly(carboxybetaine methacrylate) (PCBMA) were grafted on quartz crystal microbalance (QCM) chips via surface-initiated atom transfer radical polymerization (SI-ATRP). XPS and MS analyses demonstrate that the mass loss of these polymer brushes in oxidative environment is due to the scission of the polymer-anchoring segments. Molecular simulation further illustrates this mass loss mechanism should be always true for those polymer brushes anchored on different substrates. In situ QCM monitoring indicates that, compared with zwitterionic polymethacrylates, POEGMA brushes show the lowest mass loss rate mainly due to their cross-linked structures. This study sheds light on the contradictory reports about the oxidative stability of POEGMA and zwitterionic polymethacrylate brushes up to now, and highlights the important role of the polymer-anchoring segments playing in the oxidative stability of polymer brushes.
研究领域:
材料科学
·
生物医学工程
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DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Daoguang Teng,Peng Jin,Shiqiao Yang,Wenhuan Guo,Zhuang Zhao,Guoli Zhou,Peng Li,Yijun Cao
Various cost-effective polycyclic aromatic hydrocarbons (PAHs) were used to fabricate hyper-cross-linked polymers (HCLPs) via an external cross-linker knitting method (ECLKM) followed by N-source impregnation modification. Multiple characterization techniques and thorough tests confirmed that the resultant thermally stable materials featured large specific surface areas (up to 2870 m2 g–1), narrow pore distributions (<0.70 nm), and high pore volumes (up to 1.09 cm3/g). Effects of porosities and N-doping modification ways on HCLPs’ CO2 capture capacities have been fully studied via controlling experiments. Remarkably, HCLP 1 prepared using naphthalene without further modification possessed the highest CO2 uptake capacity (up to 3.8 mmol g–1), indicating that porosities dominated the CO2 uptake process of HCLPs compared with N-doping modification. This study offers a facile strategy to construct HCLPs with great CO2 capture performances using PAHs via a simple one-pot ECLKM.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2021
·Vol. 10
·期 3
·1010-1016
·
IF 7.393
Yaxin Zhao,Jiayu Long,Peifeng Zhuang,Ying Ji,Changcheng He,Huiliang Wang
Polyolefins like polyethylene (PE) and polypropylene (PP) without any conventional or nonconventional fluorescent chromophores have never been considered as raw materials for the preparation of fluorescent polymers. Here we report that PE and PP can be transformed into nontraditional luminescent polymers (NLPs) with strong fluorescence emissions by a simple thermal oxidation method. The maximum excitation and emission wavelengths of PE and PP oxidized products generally firstly increase with the increase of heating temperature and time, and then decrease. In addition, the oxidized products also exhibit significant excitation-dependent fluorescence (EDF) characteristics. Oxygen-containing nonconventional chromophores like hydroxyl, carbonyl and ester groups are proven to be formed in the PE and PP oxidized products. The formation of extended through-space n–π* and π–π* interactions among the nonconventional chromophores leads to the fluorescence emissions. Fluorescence emissions can also be introduced onto PE and PP surfaces by fast flame burning, and its application in anti-counterfeiting is demonstrated. This work is of great scientific importance in understanding the origin of fluorescence and will have an important impact on the development and practical applications of fluorescent materials.
研究领域:
材料科学
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化学
·
光学材料
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产品关联
DOI
高影响因子
Polymer Chemistry
·
2012
·Vol. 3
·期 8
·2217-2227
·
IF 5.321
Hang Lu,Lang Fan,Qiuming Liu,Jingren Wei,Tianbin Ren,Jianzhong Du
It is well known that silver nanoparticles have excellent antibacterial activities. However, to prepare well-defined, water-dispersible and long-term stable silver nanoparticles still remains insufficient. Presented in this paper are the design and preparation of new water-dispersible silver-decorated polymer vesicles and micelles based on a new kind of amphiphilic block-statistical copolymer, PEO-b-P(DMA-stat-tBA) (polymer 1) and its partially hydrolyzed derivative, PEO-b-P(DMA-stat-tBA-stat-AA) (polymer 2). Here PEO stands for poly(ethylene oxide), DMA for 2-(dimethylamino)ethyl methacrylate, tBA for t-butyl acrylate and AA for acrylic acid. PEO and poly(tBA) are designed to provide permanent hydrophilicity and hydrophobicity for macromolecular self-assembly in water, respectively. Poly(DMA) is introduced for the coordination of Ag+ ions to form silver nanoparticles in situ upon reduction. Poly(AA) is designed to serve the scaffold for the silver nanoparticle formation in the micelle core by electrostatic interactions with Ag+ ions. The silver-decorated polymer vesicles and micelles have been prepared in five steps: Firstly, polymer 1 was synthesized by Atom Transfer Radical Polymerization (ATRP) in the presence of CuBr/PMDETA in methanol at 60 °C. Secondly, a fraction of hydrophobic poly(tBA) in polymer 1 was hydrolyzed into hydrophilic and functional poly(acrylic acid) (PAA) to form polymer 2 in the presence of trifluoroacetic acid (TFA). Thirdly, polymer 1 was self-assembled into polymer vesicles with tuneable sizes ranged from 100–700 nm in basic water–DMF and polymer micelles with ∼50 nm diameter in neutral water–DMF, respectively. Polymer 2 was self-assembled into small micelles with ∼20 nm diameter by direct dissolution in water. Fourthly, the silver precursor AgNO3 was introduced into the polymer micelle or polymer vesicle solution where the Ag+ ion was absorbed in the core of the micelles or the membrane of the vesicles. Finally, the Ag nanoparticles were formed in the core of the micelles or the membrane of the vesicles when the reducing agent sodium borohydride was introduced. 1H NMR, GPC, DLS, UV and TEM were employed to characterize the structure and composition of the block copolymers, polymer micelles and vesicles, and silver-decorated polymer micelles and vesicles. Those water-dispersible silver-decorated polymer micelles and vesicles showed excellent antibacterial efficacy against Escherichia coli (E. coli) with quite low minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC).
研究领域:
材料科学
·
生物学
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2023
·
IF 5.5
Tiantian Song,Xiaoxue Wu,Jun Xu,Haimu Ye,Weichao Shi
Controlling deposited crystal structures in sessile droplets is the basis for applying recent droplet-making techniques in processing semicrystalline polymer solutions. But it remains a fundamental challenge to clarify the relationship between solvent evaporation and polymer crystallization. Here, we study the solvent evaporation-induced crystallization in poly(ethylene oxide) sessile droplet and reveal a two-level optical birefringence in the dried film. We find that the evaporation-induced shear flow promotes crystal growth in the radial direction, which generates anisotropic spherulites with a noncentrosymmetric orientation-sensitive birefringence, while the whole film in a droplet exhibits a centrosymmetric negative birefringence. The two-level optical birefringence is dependent on the molecular weight and polymer concentration in the morphology diagram and is proven a general phenomenon in more kinds of semicrystalline polymers. Careful analysis on evaporation dynamics indicates that the anisotropic crystal growth is a competitive result of evaporation, polymer relaxation, and crystallization. The findings in this study shed insight into the evaporation-induced crystallization in polymer droplets and offer a generic method to create anisotropic crystal patterns using droplet-processing techniques.
研究领域:
材料科学
·
物理化学
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产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 3
·331
·
IF 2.935
Xunchang Wang,Chang Cheng,Yuda Li,Feng Wang
Two new low bandgap conjugated polymers, PBDTS-ID and PBDTS-DTNT, containing isoindigo (ID) and naphtho[1,2-c:5,6-c′]bis[1,2,5]thiadiazole (NT), respectively, as an electron-deficient unit and alkylthiothienyl-substituted benzodithiophene (BDTS) as an electron-rich unit, were designed and synthesized by palladium-catalyzed Stille polycondensation. Both polymers showed good thermal stability up to 330 °C and broad absorption ranging from 300 to 842 nm. Electrochemical measurement revealed that PBDTS-ID and PBDTS-DTNT exhibited relatively low-lying highest occupied molecular orbital energy levels at −5.40 and −5.24 eV, respectively. These features might be beneficial for obtaining reasonable high open-circuit voltage and high short-circuit current. Polymer solar cells (PSCs) were fabricated with an inverted structure of indium-tin oxide/poly(ethylenimine ethoxylate)/polymer:PC71BM/MoO3/Ag. As a preliminary result, the PSCs based on PBDTS-ID and PBDTS-DTNT exhibited moderate power conversion efficiencies of 2.70% and 2.71%, respectively.Keywords:conjugated polymers;polymer solar cells;inverted structure;power conversion efficiency
研究领域:
材料科学
·
光电化学
✓ 已验证
DOI
PubMed
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Guangjun Ji,Cunyao Li,Guoqing Wang,Lei Ma,Miao Jiang,Li Yan,Yunjie Ding
A series of hybrid coupling porous organic polymers (HC-3vPPh 3 -POLs) were designed and synthesized through copolymerizing any two of tris(4-vinphenyl) phosphine ( p -3vPPh 3 ), tris(3-vinphenyl) phosphine ( m -3vPPh 3 ) and tris(2-vinphenyl) phosphine ( o -3vPPh 3 ) in different proportions by solvothermal polymerization. The BET surface area of obtained HC-3vPPh 3 -POLs is varied from 534 to 1124 m 2 ‧g −1 while the pore volume is changed from 0.43 to 2.25 cm 3 ‧g −1 , and the amount of micropores could also be regulated from 43.5 to 66.8%. The afforded Rh/HC-3vPPh 3 -POLs exhibit different conversions from 91% to 98%, selectivity to aldehyde from 79% to 90%, and the 1/b ratios from 4.0 to 11.1 (the ratio of the linear aldehydes to the branched aldehydes) by adjusting the PPh 3 microenvironment and their quantities. The superior recyclability in an autoclave reactor and stability in a fixed-bed reactor of Rh/HC-3vPPh 3 -POLs demonstrate the excellent potential of this method in preparing functional materials for heterogeneous catalysis . Combined characterization methods were employed and demonstrated that P atoms from different vinyl functional PPh 3 were uniformly dispersed and interacted with each other, leading to different structure and PPh 3 microenvironment in HC-3vPPh 3 -POLs.
研究领域:
材料化学
·
催化化学
✓ 已验证
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Yu Qiao,Wenzhong Ma,You Zhang,Tiansheng Gao,Haicun Yang,Zheng Cao,Jing Zhong
Chemical cross-linking is commonly used to prevent slippage between molecular chains in shape memory polymers (SMPs) to improve shape return. However, chemical cross-linking makes SMPs less stretchable, and the disordered network structure reduces the ability of SMPs to maintain temporary shapes. To obtain ultra-high stretchability and better shape memory properties, a cyclic polymer (C-PTHF-OH) was introduced into the shape memory polyurethane (PUC X ) network, and the PUC X network topology was controlled by adjusting the content of C-PTHF-OH molecular rings. PUC 0.5 exhibited the highest shape fixation (99.9 %) and shape recovery (98.4 %), and the higher the content of the C-PTHF-OH molecular ring, the higher the elongation at break of the prepared PUC X , with a slight decrease in tensile strength. Compared to PUC 0 (2000 % elongation at break and 32 MPa tensile strength) prepared from the linear polymer, PUC 0.5 showed up to 2150 % elongation at break and 31 MPa tensile strength. This study provides new ideas for the design of network structures for SMPs and is a new paradigm introduced into the SMPs network by cyclic topological polymers.
研究领域:
材料科学
·
高分子化学
✓ 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）