MATERIALS RESEARCH INNOVATIONS
·
2025
·
IF 0
Pingli Dai,Di Zhu,Li Jiang,Qimin Jiang,Hongjun Yang,Wenyan Huang,Xiaoqiang Xue,Bibiao Jiang
This paper takes poly2-hydroxyethyl methacrylate (PHEMA) as an example, the effects of linear and branched structures on the microrheological properties of polymers are studied to further supplement and further understand the importance of microrheological properties for optimising material properties and expanding the scope of application. The experimental results show that the higher the molecular weight of linear PHEMA, the higher the storage modulus and the higher the complex viscosity; the higher the degree of branching of branched PHEMA, the lower the storage modulus and the lower the complex viscosity. The mean square displacement of tracer particles in isopropanol solutions of linear and branched PHEMA has a good linear relationship with the lag time, and the slope of the curve of linear PHEMA(0.74 ~ 0.86) is smaller than that of branched PHEMA(0.91 ~ 0.95). The loss factor of linear PHEMA is lower than that of branched PHEMA.
研究领域:
材料科学
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高分子化学
·
流变学
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DOI
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2013
·Vol. 160
·期 8
·H502
·
IF 2.588
Wu Lei,Zhenyan Gu,Weimeng Si,Fengxiang Wang,Qingli Hao
Conducting poly (2,6-dimethoxynaphthalene) (PDMN), a novel fluorescent polymer was electrochemically synthesized in boron trifluoride diethyl etherate (BFEE) containing additional concentrated sulfuric acid via direct anodic oxidation of 2,6-dimethoxynaphthalene (DMN). The oxidation potential onset of DMN in this medium was 0.43 V, lower than other electrolyte media. PDMN films showed good electrochemical behavior and thermal stability. The structure and morphology of the polymer were investigated in detail. Fluorescent spectra indicated that the electrochemically polymerized PDMN was an excellent blue light-emitting material. The insoluble PDMN film deposited on the indium tin oxide glass was used to develop a sensor for the determination of imidacloprid based on the fluorescence quenching of PDMN. The interaction of imidacloprid and PDMN was investigated by electrochemical techniques. The fluorescent intensity of PDMN has a good linear relationship with the concentration of imidacloprid on the surface of PDMN in the range of 4.994 × 10−1 to 2.557 × 102 μg/mL with a detection limit of 3.093 ng/mL. The sensor based on PDMN films showed high recognition ability for imidacloprid and will have more potential applications in the industrial or environmental and healthy fields.
研究领域:
材料科学
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环境科学
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分析化学
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DOI
高影响因子
CORROSION SCIENCE
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2017
·
IF 5.245
Mingjun Cui,Siming Ren,Songlv Qin,Qunji Xue,Haichao Zhao,Liping Wang
Hexagonal boron nitride (h-BN), a structural analogue of graphene, is a better alternative for anticorrosive coatings because of its electrical insulation properties. In this work, few-layer h-BN nanosheets are obtained by the exfoliation of stacked h-BN powders with poly(2-butyl aniline) (PBA) and incorporated into epoxy coatings for protecting metallic substrate against corrosion. Results show that as prepared composite coatings exhibit high impedance modulus and low water absorption, suggesting their superior performance of corrosion protection owing to the “labyrinth effect” of h-BN and passivation effect of PBA on the metal substrates.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
Soft Matter
·
2015
·Vol. 11
·期 15
·3046-3055
·
IF 4.029
Tianjiao Li,Hui Tang,Peiyi Wu
Detailed phase transition processes of poly(2-isopropyl-2-oxazoline) (PIPOZ)/poly(N-isopropylacrylamide) (PNIPAM) and PIPOZ/poly(N-vinylcaprolactam) (PVCL) mixtures in aqueous solution were investigated by DSC, temperature-variable 1H-NMR, optical microscopy and FT-IR spectroscopy measurements accompanied with two-dimensional correlation spectroscopy (2Dcos) and perturbation correlation moving window (PCMW) analytical methods. Through the comparison of these two systems, it is revealed that PVCL chains can interact with PIPOZ chains directly through the polymer–water–polymer cross-linking hydrogen bonds (CO⋯D–O–D⋯OC), which induce their transition process as one. However, in the PIPOZ/PNIPAM mixture, the phase transition of the given component (PNIPAM or PIPOZ) is indirectly affected by the presence of the second component, because the strong hydrogen bonds CO⋯D–N in PNIPAM components forbid the direct connection with PIPOZ, which induces two phase transition processes separately with no liquid–liquid phase separation (LLPS). Additionally, the formation of polymer–water–polymer hydrogen bonds (CO⋯D–O–D⋯OC) is highlighted as the key process in macroscopic LLPS.
研究领域:
高分子化学
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物理化学
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产品关联
DOI
PubMed
高影响因子
PHYTOCHEMICAL ANALYSIS
·
2022
·Vol. 33
·期 4
·590-598
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IF 3.024
Xuemei Xue,Fei Deng,Zhenkai Ge,Jingwen Meng,Xiya Liu,Yongheng Zhao,Yanggen Hu,Xu Ling
Introduction The quantitative analysis of trace resveratrol and polydatin in plant tissues is suitable for elucidation of the compounds' mechanisms of action. Objectives The main objective of this work was to develop a feasible and effective sample pretreatment method to measure the concentrations of resveratrol and polydatin in complex samples. Methodology A polymer sorbent, poly(2-mercaptobenzimidazole), was electrochemically prepared and utilized for selective extraction, while resveratrol and polydatin were used as target analytes. The sorbent was characterized by cyclic voltammetry, scanning electron microscopy and Fourier transform infrared spectroscopy. After extraction and elution, the analytes were analyzed by a Thermo U3000 HPLC system. Several affecting parameters, including the volume of elution solution, sample pH value, sample flow rate and sample volume, were evaluated and optimized. Results The proposed method showed good linearity with low limits of detection (from 0.5 to 0.8 ng·mL −1 ) and ideal accuracy with spiked recoveries from 81.30% to 99.16%. A good enrichment factor (more than 200-fold) together with good sensitivity was obtained with this method. Analysis of resveratrol and polydatin in Polygonum cuspidatum samples by this method is efficient. Conclusion The method developed in this work exhibits several significant merits, including easy operation and high extraction efficiency, indicating that electrochemically prepared polymer sorbent is useful for sample pretreatment and analysis of traditional Chinese medicine samples.
研究领域:
分析化学
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中药学
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DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2019
·
IF 3.621
Muhammad Atif,Chaoshi Chen,Muhammad Irfan,Fatima Mumtaz,Kang He,Miao Zhang,Lijuan Chen,Yanmei Wang
In this work, poly[(2-methyl-2-oxazoline)-random-glycidyl methacrylate] (PMOXA-r-GMA) and poly(4-vinyl pyridine)-block-poly(glycidyl methacrylate) (P4VP-b-PGMA) were synthesized by cationic ring opening polymerization (CROP) of 2-methyl-2-oxazoline (MOXA) and reversible addition-fragmentation chain transfer (RAFT) polymerization of 4-vinyl pyridine (4VP) followed by their random and block copolymerization with glycidyl methacrylate (GMA), respectively. Then poly(2-methyl-2-oxazoline)/poly(4-vinyl pyridine) (PMOXA/P4VP) based binary polymer brushes on silicon/glass substrate were fabricated using spin coating of the mixture of PMOXA-r-GMA and P4VP-b-PGMA copolymer solution followed by annealing process at 110 °C. Afterwards, these polymer brushes were characterized via water contact angle (WCA), X-ray photoelectron spectroscopy (XPS), variable angle spectroscopic ellipsometry (VASE), and atomic force microscopy (AFM) techniques. The results showed that the surface composition on the substrate surface could be adjusted by tuning the composition of the mixture of polymer solution used for the preparation of mixed brushes. Moreover, it also showed the swelling and de-swelling of mixed polymer brushes in a systematic way between two specific points during varying the pH of the surrounding medium from 2 to 10. Finally, the tunable behavior of PMOXA/P4VP based mixed brushes against bovine serum albumin (BSA) adsorption/desorption was investigated by fluorescein isothiocyanate-labelled BSA (FITC-BSA) assay and ellipsometry measurements. The results indicated that by changing the pH value from 2 to 10, the PMOXA/P4VP based mixed brushes could adsorb and desorb protein from very low to high amount depending upon the composition of PMOXA-r-GMA and P4VP-b-PGMA in preparing solution used for the PMOXA/P4VP based coatings, and ~89% of the adsorbed protein could be desorbed under the selected conditions.
研究领域:
材料科学
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生物医学工程
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2021
·Vol. 168
·期 9
·090545
·
IF 4.316
Jia Wen,Zhenying Chen,Sheng Han,Jinhui Zhu,Changchun Ke,Emmanuel Kymakis,Xiaodong Zhuang
Poly(ethylene oxide) (PEO) is regarded as an attractive solid-state electrolyte in lithium-ion batteries (LIBs). However, relatively low ionic conductivity of pristine PEO is a critical bottleneck to boost high-performance solid-state LIBs. Herein, poly(2-aminoazulene) (PAAz) was synthesized using the oxidation polymerization strategy and acted as a polymeric filler in the fabrication of PEO−PAAz composite electrolyte. Compared with PEO electrolyte, the composite electrolyte had a better ionic conductivity (9.27 × 10−6 vs 6.47 × 10−5 S cm−1 at 30 °C), Li+ transference number (0.21 vs 0.51), and suppression of Li dendrites. Consequently, the PEO−PAAz electrolyte paired Li/LiFePO4 cell had a high capacity (156 mAh g−1 at 0.5 C, 1 C = 170 mA g−1) and stability (only 8% capacity loss after 300 cycles); these are better than those of the PEO-based cell (132 mAh g−1, 45% capacity loss). In addition, the PEO−PAAz-based cell could run for 1200 cycles with 60% capacity retention at 1 C. This study provides both a new organic filler for PEO-based solid-state LIBs and a method of improving the performance of solid-state LIBs, especially in terms of a long lifetime.
研究领域:
材料科学
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能源存储技术
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高分子化学
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产品关联
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 72
·41270-41279
·
IF 2.936
Ruizhang Xu,Jiantao Wang,DanDan Chen,Feng Yang,Jian Kang,Ming Xiang,Lu Li,Xingyue Sheng
Inspired by the special pH value-responsive and strong hydrophilic ability of poly(2-ethyl-2-oxazoline) (PEOX), in this study, asymmetric polysulfone (PSf) and PSf/PEOX ultrafiltration membranes were prepared by a phase separation method, wherein different dosages of PEOX (0–3 wt%) were incorporated into the PSf casting solution as polymeric additives. The effects of PEOX dosages on the phase separation kinetics, chemical properties, morphology, hydrophilicity, porosity and performances such as pure water flux (PWF), Bull Serum Albumin (BSA) rejection, pH value responsiveness and anti-fouling property were investigated in detail. The hydrophilicity, pure water flux, BSA rejection and anti-fouling property were improved significantly after the incorporation of PEOX. The PWF increased from 213.5 L m−2 h−1 to 419.8 L m−2 h−1 as the PEOX dosage increased from 0 to 1 wt%, meanwhile, the BSA rejection increased to more than 98.4%. Viscosity and effective diffusion coefficient of PSf/PEOX solution were studied to elucidate the role of PEOX in phase separation and morphology of the membrane. Results showed that the incorporation of PEOX leads to the phase separation of casting solution by making it more prone to instantaneous demixing, further determining the morphology and performances of the membrane. Interestingly, the resulting membranes showed pH value-responsive properties, whereby the water flux increased along with an increase in the pH value. This interesting feature of the membranes broadens their application potential in many specific cases. The related filtration mechanism has also been proposed.
研究领域:
材料科学
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环境工程
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Hongjing Pei,Yanmei Han,Yong Liu,Xu Han
Although copper-aliphatic amines have been extensively used as catalysts for the polymerization of 2,6-dimethylphenol (DMP) to poly (2,6-dimethyl-1,4-phenylene oxide) (PPO), the high polydispersity index (PDI) of PPO and high content of 3,3′,5,5′-tetramethyl-4,4'diphenoquinone (DPQ) in PPO significantly affect the physical properties of PPO . In this study, different CuBr-aromatic amines have been used as catalysts for synthesizing PPO. CuBr– N -methylbenzylamine shows a high yield of PPO (94.4 %) with the low DPQ yield (0.46 %) and PDI (1.33) in the presence of 0.1 % H 2 O, which facilitates the formation of dinuclear Cu(Ⅱ) species. In addition, the low dielectric constants (2.43 and 2.25) and low dielectric loss factors (1.07 × 10 −3 and 1.29 × 10 −3 ) of the PPO synthesized by CuBr– N -methylbenzylamine and CuBr-4-aminopyridine again indicate that aromatic amines are more appropriate for the synthesis of PPO with superior dielectric properties . Meanwhile, the high-molecular-weight PPO can be successfully redistributed to low-molecular-weight PPO by adding DMP in the presence of CuBr– N -methylbenzylamine, and the decreased T g values from 212.5 to 187.8 °C with decreasing M n values from 2.7 × 10 4 to 5.5 × 10 3 indicate the improved processability of the low-molecular-weight PPO. This study provides new insights on important roles of aromatic amines in the synthesis of PPO.
研究领域:
高分子化学
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材料科学
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Jian Meng,Shilei Ren,Jie Dong,Juan Li,Shijie Liu,Qi Liu,Ruiping Zhang
Background Photothermal therapy (PTT) has unique advantages, including high temporal and spatial controllability and relatively few toxic side effects, and the development of highly effective photothermal agents could greatly improve the efficacy of PTT. Objective The aim of this study was to investigate the efficacy of poly-2-phenylbenzodithiazole (PB)-based nanoprobes for PTT, and the photoacoustic and magnetic resonance imaging properties and photothermal therapeutic effects of the nanoprobes were systematically evaluated by in vivo imaging and in vitro cellular experiments. Methods PB-based nanoparticles SA-PB were prepared by an in situ initiated polymerisation process, and the physical and chemical properties of SA-PB were characterised by TEM, UV–vis, DLS, Zeta potential and XPS. The photothermal conversion of SA-PB nanoparticles was investigated by NIR laser. The photothermal therapeutic effect of SA-PB nanoparticles was investigated by AM-PI cell live-dead staining method. Results The results of in vivo imaging showed that the nanoparticles (PLGA/ICG/Oxa) could be well applied to photoacoustic imaging and nuclear magnetic imaging, while the photothermal treatment well inhibited the growth of tumour cells. CONCLUSION : In this study, a PB-based nanoparticle, SA-PB, was successfully prepared with excellent photothermal properties as well as good photoacoustic and magnetic resonance imaging capabilities, which has potential applications in PTT
研究领域:
生物医学工程
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肿瘤学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2013
·Vol. 4
·期 1
·510-515
·
IF 2.562
Huan Wang,Baoqing Shentu,Zhixue Weng
A one-pot synthetic approach for the preparation of poly(2,6-dimethyl-1,4-phenylene oxide)/polystyrene (PPO/PS) alloy in aqueous medium was developed. The method was based on the combination of the oxidative coupling polymerization of 2,6-dimethylphenol (DMP) to form PPO in the presence of a reactive swelling agent, styrene (St), and in situ reverse atom transfer radical polymerization (RATRP) of St initiated by 2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (AIBI) in alkaline aqueous solution. The complex of CuCl2 and 4-dimethylaminopyridine (DMAP) was utilized as the catalyst to catalyze the two types of polymerization mentioned above. Oxygen was employed as the sole oxidant to synthesize PPO. The introduction of St during the oxidative polymerization of DMP could increase the molecular weight of PPO. Finally thermodynamically compatible PPO/PS alloy was successfully prepared.
研究领域:
高分子化学
·
材料科学
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DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 10
·4092-4098
·
IF 3.288
Yu-wei Liu,Ping Wang,Jun Wang,Bo Xu,Jin Xu,Jiu-gang Yuan,Yuan-yuan Yu,Qiang Wang
Poly(2-hydroxyethyl methacrylate) (PHEMA) hydrogels with high transparency and excellent mechanical properties are fabricated via in situ free radical polymerization of 2-hydroxyethyl methacrylate (HEMA) in mixtures of water and 1-butyl-3-methylimidazolium chloride (BmimCl) followed by the exchange of BmimCl with water. Compared with the PHEMA hydrogels prepared without BmimCl, the obtained hydrogels display a denser and more homogeneous microstructure, which contributes to their highly transparent appearance and outstanding mechanical properties. The hydrogels could achieve elongation at break and tensile strength up to 705% and 173 kPa, respectively, at swollen equilibrium states. Furthermore, the hydrogels also reveal fast recovery in water after circle elongation, showing anti-fatigue properties owing to their quick reformation of hydrogen bonds between polymer chains. More importantly, the hydrogels are able to retain considerable mechanical strength in water over a wide pH range (1 to 13) due to their stable cross-linking structures. It is believed that this novel type of transparent PHEMA hydrogel exhibiting outstanding mechanical properties, superior stability and anti-fatigue properties would find extensive applications in biomedical and industrial fields.
研究领域:
材料科学
·
生物医学工程
✓ 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）