CHINESE JOURNAL OF POLYMER SCIENCE
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2021
·Vol. 39
·期 12
·1538-1549
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IF 3.603
Lin Sha,Sun Hui,Cornel Erik Jan,Jiang Jin-Hui,Zhu Yun-Qing,Fan Zhen,Du Jian-Zhong
Dented nanospheres show promising potential in drug delivery, nanomotors, etc . However, it is still challenging to prepare them by homopolymer self-assembly because of the strict structural requirements of the homopolymer. Herein, we propose a strategy for preparing dented nanospheres from homopolymers by co-assembly with a short peptide. They were co-assembled from poly(2-hydroxy-3-((4-(ethoxycarbonyl)phenyl)amino)propyl methacrylate) (PHBzoMA 59 ) and ( S )-2-(( S )-2-((((9 H -fluoren-9-yl)methoxy)carbonyl)amino)-3-phenylpropanamido)-3-phenylpropanoic acid (Fmoc-FF-OH). PHBzoMA homopolymers can only self-assemble into nanospheres without dent, and the addition of a short peptide introduced hydrogen bonding and complementary π-π stacking interactions led to the final dented nanosphere morphology. The weight fractions of the short peptide can be adjusted to regulate the final morphology. It was confirmed that the radius of curvature of the dent on the surface was related to the organic bubble inside the protospheres prepared at critical aggregation concentration (CAC). The organic bubble can be adjusted by altering the kind of organic solvent and solution pH, which allowed control over the dented nanosphere dimension. The use of different organic solvents with various polarities allows adjustment of the interfacial tension, and hence the denting degree. This degree can also be controlled by manipulating the solution pH to (de)protonate the short peptide and homopolymer. Furthermore, the versatility of this method was highlighted by using a different homopolymer and the applicability of the resulting dented nanospheres was demonstrated by decoration with gold nanoparticles. Overall, this study provided important insights and a new simple strategy to prepare dented nanospheres in a controlled fashion.
研究领域:
材料科学
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生物化学
·
纳米技术
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2021
·
IF 4.598
Suyan He,Luminita Marin,Xinjian Cheng
Fe 3+ and Fe 2+ are common metal ions in natural water environments and creatures. The development of water-soluble fluorescent sensors for detecting Fe 2+ /Fe 3+ ions was of great significance. In this work, two kinds of boron fluoride dipyrrole (BODIPY) fluorescent small-molecules were synthesized firstly. One of the small molecules contains a thioester bond that can be used as a chain transfer agent to participate in the polymerization process, and the other contains an unsaturated C = C double bond at the meso position. Through the reversible addition-fragmentation chain transfer polymerization (RAFT) polymerization method, methacrylic acid (MAA) and methacrylamide (MAM) were used as the main monomers, and small molecular fluorescent monomers were introduced to the end of the main chain. In this way, fluorescent macromolecules were obtained. The polymers were water soluble owing to the presence of long enough hydrophilic carboxyl and amide chains. These fluorescent probes exhibit high sensitivity to Fe 2+ /Fe 3+ , good selectivity, and anti-interference of other ions. The detection limit for Fe 2+ was as low as 2.3 × 10 −7 M, and the detection limit for Fe 3+ can reach up to 4.5 × 10 −7 M. The results show that these probes can be used as good sensors to identify Fe 2+ and Fe 3+ . Moreover, the fluorophores could be incorporated into polymer chains as the RAFT reagents and/or functional monomers.
研究领域:
化学
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材料科学
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产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2022
·
IF 9.136
Jianfei Xiao,Xiaofang Yuan,Tian C. Zhang,Like Ouyang,Shaojun Yuan
Heteroatomic doped porous carbon (HPCs) is a promising advanced material, showing great application potential in greenhouse gas capture. Here, in-situ N-doped porous carbon (NPC) was developed via a novel and readily scalable strategy − one-step solvent-free melt polycondensation assisted by organic potassium salts, followed by pyrolysis and activation. As both a template and an activator, the added C 6 H 5 K 3 O 7 played an important role to create abundant microporous structure. The as-fabricated NPC-650–0.5 showed a rich N content (6.11 at.%), abundant narrow micro-porosity (0.3437 cm 3 ·g −1 ), and a high surface area (1209.37 m 2 ·g −1 ) and delivered an excellent CO 2 static adsorption capacity (4.16 mmol·g −1 and 8.40 mmol·g −1 at 100 and 500 kPa), a fast adsorption kinetics (circa 98% of balance capacity in 12 min), moderate heat of adsorption (25 to 30 kJ/mol), high selectivity of CO 2 /N 2 , and outstanding uninterrupted recyclability. Both the narrow micropore volume and N-doping sites had strong effects on the CO 2 adsorption capacity, indicating a physical and chemical adsorption process with the mechanism being multi-layer adsorption by the micropore filling. This work highlights the great potential of the NPC-650–0.5 for capturing CO 2 and offers new insights into a green activator and a simple and easy-to-scale method for preparing HPCs.
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
SENSORS AND ACTUATORS A-PHYSICAL
·
2022
·
IF 4.291
Xinze Yang,Weihua Pei,Chunrong Wei,Xiaowei Yang,Huiling Zhang,Yang Wang,Miao Yuan,Qiang Gui,Yuanyuan Liu,Yijun Wang,Hongda Chen
Poly(3,4-ethylenedioxythiophene) (PEDOT) is an organic material with good electrochemical activity and electrical conductivity , and it is usually electrochemically deposited on the neural probes to improve their interface properties . However, the workload for electrode modification using an electropolymerization method becomes greater with the increase in the number of electrode channels. Moreover, the integration of electrodes and amplification circuits makes electropolymerization difficult to implement. In this study, a chemical polymerization method was proposed to produce conducting polymer PEDOT on the electrode sites. Compared with electropolymerization, it does not require each electrode site to be connected to a power source. It is competitive in batch preparation and is particularly suitable for neural microelectrodes prepared by a micro-electromechanical systems (MEMS) process. The charge storage capacity, impedance, mechanical stability , and electrochemical stability of conducting polymer PEDOT prepared by the proposed method are evaluated. The results indicate that the method is feasible for batch modification of the microelectrodes, and it is also suitable in cases where energization is inconvenient.
研究领域:
生物医学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Chao Li,Chihamo Jike,Yan Song,Guo Liang Li,Yi Jia,Junbai Li
Materials with cascade-responsive self-healing similar to that of living organisms can be of great practical value. Herein, a synthetic polymeric material is demonstrated that can achieve cascade-responsive self-healing via a mechanical-force-triggered self-crosslinking reaction. Ferrocene (Fc) is used as a mechanophore, and its decomposition when the material is subjected to a mechanical force generates Fe 3+ , which forms a complex with catechol residues present in side chains; thus, forming a new network structure. This cross-linking results in the tensile strength of CRSP-3 recovered completely after compression at 50 MPa for 5 min and standing for 72 h at room temperature. This strategy also provides the material with self-strengthening ability under repeated mechanical loading. The material exhibits the ability to resist the diffusion of micro cracks caused by high pressure in seawater. This study provides design principles for the construction of a new generation of intelligent bio-like self-healing materials.
研究领域:
材料科学
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化学
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
Applied Materials Today
·
2024
·
IF 7.2
Xiangfeng Hua,Yi Jing,YeYan Ni
Printing encrypted messages and security labels using stimuli-responsive luminescent materials can no longer meet the requirements of protecting high-level confidential information. In this paper, carbon dots (CDs) with near-infrared emission potential at low temperatures were prepared by thermal polycondensation using citric acid as a carbon source and urea as a nitrogen source in a polysuccinimide (PSI) matrix. The prepared CDs@PSI achieved visible (yellow-green) and near-infrared (NIR) dual-mode afterglow emission at room temperature. The C=N covalent bond and hydrogen bond formed during the thermal polycondensation of CDs and PSI, as well as the crystal structure, multiple fixations, and rigidity effect forming during the slow cooling process of PSI are crucial to the activation of bimodal afterglow. By comparing with the samples prepared by the room temperature co-crystallization method, it is found that the effective regulation of the energy gap value can promote the simultaneous generation of intersystem interference and anti-intersystem interference, which is beneficial to RTP and TADF emission behavior. Under direct visual conditions, NIR-RTP is completely covered by yellow-green TADF and can be captured by a camera loaded with a filter with a cut-off wavelength of 700 nm. The enhancement effect of subfluorescent groups (C=O/C=N) on the surface of CDs with PSI polymer crystal bonds is the main reason for the visible light-activated afterglow. Based on the fact that two different afterglow emissions of a single excitation light source and visible afterglow can hide NIR afterglow coding information, a dual-mode delayed fluorescence/phosphorescence anti-counterfeiting system was constructed, and an anti-counterfeiting strategy for visible afterglow to hide NIR afterglow coding information was developed.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
·
IF 8.2
Yuan Xu,Zhicheng Deng,Yun Chen,Fang Fang Wu,Chao Huang,Yong Hu
A novel mussel-inspired adhesive hydrogel with enhanced adhesion based on methacrylated catechol-chitosan (MCCS) and dopamine methacrylate (DMA) was prepared via photopolymerization. The structure and morphology of the MCCS/DMA adhesive hydrogel were investigated by using FTIR , NMR, XRD, TG, and SEM. The rheological and texture properties, swelling and degradation characteristics, as well as the adhesion mechanism of the hydrogels were also examined. These results revealed that the MCCS/DMA hydrogels have a dense double cross-linking network structure with porous internal microstructures, and exhibited controllable swelling and degradation properties, good thermostability , and stable rheological characteristics. Furthermore, the adhesive mechanism of MCCS/DMA hydrogel has been confirmed by the FTIR and 2D correlation FTIR spectroscopy . Additionally, the results of in vitro cytotoxicity assessment indicated that the resulting hydrogels have good cytocompatibility. Overall, the MCCS/DMA adhesive hydrogel may have potential applications in medical bioadhesives.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2052
·
IF 4.6
Peijian Sun,Yipeng Wang,Song Yang,Xuehui Sun,Bin Peng,Lining Pan,Yunzhen Jia,Xiaobing Zhang,Cong Nie
Heterocyclic aromatic amine molecularly imprinted polymer nanospheres with surface-bound dithioester groups (haa-MIP) were firstly synthesized via reversible addition-fragmentation chain transfer (RAFT) precipitation polymerization. Then, a series of core-shell structural heterocyclic aromatic amine molecularly imprinted polymer nanospheres with hydrophilic shells (MIP-HSs) were subsequently prepared by grafting the hydrophilic shells on the surface of haa-MIP via on-particle RAFT polymerization of 2-hydroxyethyl methacrylate (HEMA), itaconic acid (IA), and diethylaminoethyl methacrylate (DEAEMA). The haa-MIP nanospheres showed high affinity and specific recognition toward harmine and its structural analogs in organic solution of acetonitrile, but lost the specific binding ability in aqueous solution. However, after the grafting of the hydrophilic shells on the haa-MIP particles, the surface hydrophilicity and water dispersion stability of the polymer particles of MIP-HSs greatly improved. The binding of harmine by MIP-HSs with hydrophilic shells in aqueous solutions is about two times higher than that of NIP-HSs, showing an efficient molecular recognition of heterocyclic aromatic amines in aqueous solution. The effect of hydrophilic shell structure on the molecular recognition property of MIP-HSs was further compared. MIP-PIA with carboxyl groups containing hydrophilic shells showed the highest selective molecular recognition ability to heterocyclic aromatic amines in aqueous solution.Keywords:core-shell;molecularly imprinted polymers;hydrophilic shells;heterocyclic aromatic amines
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Pigment & Resin Technology
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2022
·Vol. 53
·期 2
·145-153
·
IF 1.126
Wanting Zhao,Lijun Chen
PurposeSelf-crosslinked long fluorocarbon acrylate polymer latex has good hydrophobic and oleophobicity, weather resistance, aging resistance, stability and other excellent properties, which make the polymer be widely used in coatings, dyes, adhesives and other products. The purpose of this study is to prepare self-crosslinked long fluorocarbon acrylate polymer latex via semi-continuous seeded emulsion technology and carry out comparative study on two different cross-linked monomers.Design/methodology/approachMethyl methacrylate (MMA) and butyl acrylate (BA) were used as the main monomers, dodecafluoroheptyl methacrylate (DFMA) as the fluoromonomer, hydroxypropyl methacrylate (HPMA) andN-methylol acrylamide (NMA) as cross-linked monomers, and 1-allyloxy-3–(4-nonylphenol)-2-propanol polyoxyethylene (10) ether (ANPEO10) and 1-allyloxy-3–(4-nonylphenol)-2-propanol polyoxyethylene (10) ether ammonium sulfate (DNS-86) as compound emulsifiers via the semicontinuous-seeded emulsion polymerization.FindingsThe properties of the polymer emulsions, which are prepared with two different cross-linked monomers, are compared and discussed, and it is concluded that HPMA is more suitable for the preparation of self-crosslinked polymer emulsions. The formula of the polymer latex is ANPEO10: DNS-86 = 1:1, and the mass ratio of the monomers used in the polymer is MMA: BA: DFMA: HPMA = 14.40:14.40:0.60:0.60.Practical implicationsSelf-crosslinked long fluorocarbon acrylate polymer latex can be used in many fields such as coatings, dyes, adhesives and other products.Originality/valueThe self-crosslinked long fluorocarbon acrylate polymer latex is prepared by mixing the nonionic emulsifier ANPEO10 and the anionic emulsifier DNS-86 when potassium persulfate is used as the thermal decomposition initiator and the semicontinuous-seeded emulsion technology is adopted and the comparative study on two different cross-linked monomer is carried out, which is not reported in the open literatures.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2011
·Vol. 212
·期 7
·737-743
·
IF 2.437
Hao Chen,Yingwu Luo
Nanocapsules made of a cross-linked poly(dodecafluoroheptyl acrylate) shell were successfully synthesized by interfacial RAFT miniemulsion polymerization. The well-defined hollow fluorinated polymer structures were obtained by the subsequent removal of the liquid core materials. The core/shell ratio could be easily tuned up to 1:1 by changing the conditions. In the cases of high core/shell ratio of 1:2 and 1:1, the nanocapsules were severely deformed, which was improved by increasing the cross-linker amount up to 30 wt.-%. It was concluded that the utility of the interfacial RAFT miniemulsion polymerization overcame the thermodynamic and kinetic barriers in a conventional miniemulsion polymerization.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULES
·
2019
·
IF 5.997
Xiao-Fei Xu,Cai-Yuan Pan,Wen-Jian Zhang,Chun-Yan Hong
Stimuli-responsive polymeric vesicles have attracted great attention in drug delivery due to their intrinsic hollow structures and “on demand” release of drugs upon environmental stimuli. The drug-release kinetics from polymeric vesicles, which is usually dependent on the stimuli-responsive behaviors of the polymeric vesicle, has great impacts on the therapeutic efficacy. Over the past decade, polymerization-induced self-assembly (PISA) has been demonstrated to be a powerful strategy to prepare the polymeric vesicles. However, fabrication of stimuli-responsive vesicles with adjustable drug release kinetics via PISA has been rarely reported, which may be due to the poor selectivity of functional membrane-forming polymers in the PISA system. Herein, a series of vesicles with different pH-responsive behaviors were fabricated via RAFT dispersion copolymerization of (diisopropylamino)ethyl methacrylate (DIPEMA) and benzyl methacrylate (BzMA). Both the content of DIPEMA units in hydrophobic P(DIPEMA-co-BzMA) blocks and the DP of P(DIPEMA-co-BzMA) have great influence on the pH-responsive behaviors of the vesicles, which can be used to adjust the responsive release rate of RhB from the vesicles upon the same pH switch.
研究领域:
材料科学
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药学
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2815
·
IF 5
Zhiquan Zhang,Baimei Dai,Peng Xu
Due to the increasing difficulty of drilling in the later stages of oil and gas field development, the development of micro-pores and micro-fractures is becoming common. Conventional plugging agents have relatively large particle sizes. So, choosing the appropriate plugging agent can prevent leakages. Using the inverse emulsion polymerization method, acrylamide, 2-acrylamide-2-methylpropane sulfonic acid and acrylic acid were selected to be the main reaction monomers, N,N′-methylenebisacrylamide was used as a crosslinking agent, sorbitan monostearate and polyoxyethylene sorbitan anhydride monostearate were used as emulsifiers, and 2,2′-azobis(2-methylpropionamidine) dihydrochloride was used as the initiator to synthesize a nano-scale plugging agent for oil-based drilling fluid. The plugging agent was characterized using infrared spectroscopy, scanning electron microscopy, and thermogravimetry analysis. The results showed that the plugging agent is spherical and uniform in size, with particles being in the submicron range. Additionally, it exhibited strong temperature resistance. Finally, the performance of the plugging agent was evaluated via experiments conducted under normal temperature and pressure, high-temperature and high-pressure, and core-plugging conditions. After adding the plugging agent to the oil-based drilling fluid, the basic rheological properties of the oil-based drilling fluid were not significantly affected. Furthermore, the filtration loss was significantly reduced under normal temperature and pressure, as well as under high-temperature and high-pressure conditions, after aging. When the plugging agent with 3% concentration was added, the reduction rate of pore core permeability reached 96.04%. Therefore, the plugging agent for the oil-based drilling fluid can effectively improve the wellbore stability and has a promising potential for field applications.Keywords:polymer microspheres;nano-scale;oil-based drilling fluid;plugging agent;inverse emulsion polymerization
研究领域:
石油工程
·
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）