JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
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2013
·Vol. 51
·期 13
·2892-2899
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IF 3.543
Xin Wang,Jin-Ping Gao,Qiao-Ling Zhao,Jin Huang,Guo-Liang Mao,Wei Wu,Ying-Nan Ning,Zhi Ma
Well-defined polymethylene- block -polystyrene (PM- b -PS) diblock copolymers were synthesized via a combination of polyhomologation of ylides and reversible addition-fragmentation chain-transfer (RAFT) polymerization of styrene. Trithiocarbonate-terminated polymethylenes (PM-TTCB) ( M n = 1400 g mol −1 ; M w / M n = 1.09 and M n = 2100 g mol −1 ; M w / M n = 1.20) were obtained via an esterification of S −1-dodecyl-S′-(α,α′-dimethyl-α″-acetate) trithiocarbonate with hydroxyl-terminated polymethylene synthesized via polyhomologation of ylides followed by oxidation. Then, a series of PM- b -PS ( M n = 5500–34,000 g mol −1 ; M w / M n = 1.12–1.25) diblock copolymers were obtained by RAFT polymerization of styrene using PM-TTCB as a macromolecular chain-transfer agent. The chain structures of all the polymers were characterized by proton nuclear magnetic resonance ( 1 H NMR), gel permeation chromatography, and Fourier transform infrared spectroscopy. The thiocarbonylthio end-group of PM- b -PS was transformed into thiol group by aminolysis and confirmed by UV–vis spectroscopy. In addition, microfibers and microspheres of such diblock copolymers were fabricated by electrospinning process and observed by scanning electron microscopy (SEM). © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 2892–2899
研究领域:
高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
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2019
·
IF 1.426
Yan Zhang,Qihang Zhou,Yujian Liu
Polymethylene-b-poly(ethylene glycol) (PM-b-PEG) with different block length ratio was synthesized by a combination of polyhomologation and coupling reaction. The effect of hydrophilic and hydrophobic block length on the crystallization process and self-assembly behavior of PM-b-PEG was self-assembled were investigated. The results showed that with the increase of methylene units, the crystallization temperature of PM block raised from 54.59 °C to 70.93 °C gradually, while that of the PEG block reduced from 17.54 °C to 15.23 °C. In addition, the amphiphilic PM-b-PEG was self-assembled into star-like micelles in water, and its diameter extended from 98.2 nm to 151.9 nm as the block length of hydrophobic PM increased from 30 to 70. And the micelles also exhibit super stability when the concentration of copolymer precursor is 0.50 ∼ 0.90 mg/ml and the storage temperature lies in the range of 25 ∼ 60 °C.
研究领域:
高分子化学
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 14
·147513
·
IF 3.721
Yonghong Li,Ying Ji,Yuan Li,Yutong Li,Guodong Ma,Xinsheng Liu
A poly (methylene blue)/copper nanowires modified nano-carbon paste electrode (PMB/CuNWs@nano-CPE) was developed for ultra-sensitive detection of luteolin. The morphology of copper nanowires was characterized by transmission electron microscopy (TEM). Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were utilized to investigate the electrochemical properties of the fabricated electrodes. In comparison with bare nano-carbon paste electrodes (nano-CPE), the PMB/CuNWs@nano-CPE presented better electrocatalytic activity towards luteolin, including reduced oxidation peak potential and enhanced oxidation peak current. The influencing factors on sensitivity were discussed, such as instrumental parameters, concentration of methylene blue, electropolymerization cycles, the amount of copper nanowires, pH value, accumulation potential and accumulation time. Under optimal conditions, two linear calibration ranges of 0.5 nM−0.01 μM and 0.01 μM−1 μM and the detection limit (LOD) of 0.1 nM (S/N = 3) were obtained for luteolin. The satisfying results were achieved for the determination of luteolin in Chinese medicine capsule samples.
研究领域:
分析化学
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材料科学
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药学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 38
·e54433
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IF 3
Shajie Luo,Junyu Dai,Jialin Chen,Wanping Li,Yuan Wang,Dongmei Li,Yan Chen,Yu Fan
In this work, a series of semi-crystalline semi-aromatic poly (ether amides) (PAT-2–PAT-10) with varying length of polymethylene moiety (2, 4, 6, 8 or 10 methyl groups) and number of ether groups in the main chain were synthesized by the nucleophilic substitution reaction of semi-aromatic difluorobenzamido alkanes with 1, 4-benzenediol at about 190–200°C, using K 2 CO 3 as catalyst, N -methyl pyrrolidione (NMP) as reaction solvent. And their viscosities, thermal, and mechanical properties were investigated. The inherent viscosities, glass transition, melting and degradation temperatures and tensile strength values of the synthesized polymers were in the range 0.141–1.829 dL g −1 , 119.1–165.0°C, 272.4–345.4°C, and 371.4–451.1°C, and 61.2–79.2 MPa respectively. Moreover, they were found to have good solubility in concentrated sulfuric acid and trifluoroacetic acid at room temperature. The length of poly methylene group and ether bond in the polymer main chain had significantly influenced their thermo mechanical properties. The polyamides PAT-6–PAT-10 had better thermo mechanical property than that of commercial polyamide, PA6T/66.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Tianchen Xia,Tiantian Zhu,Yingchun Miao,Xiangyu Zhao
Organic molecules such as viologens with a nitrogen redox center show promise as efficient anion storage materials in rechargeable batteries. However, the high solubility of viologens in liquid electrolytes limits their wide electrochemical application. Herein, an insoluble polymerized polyxylylviologen chloride (PXVCl2) is first developed as a chloride ion storage electrode in chloride ion batteries. The as-prepared PXVCl2 electrode exhibits a competitive discharge capacity of 140 mA h g–1 (86% of the theoretical discharge capacity) compared to that of the previously reported organic conducting polymer electrodes. The incorporation of graphene in the PXVCl2 material achieves significant improvements in reaction reversibility and rate capability of the PXVCl2 electrode. Importantly, the nitrogen redox reactions based on chloride ion transfer of the PXVCl2 electrode are demonstrated.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2020
·Vol. 167
·期 6
·067501
·
IF 3.721
Xiaoying Wang,Miao Gong,Linyu Li,Liangrui Lv,Xin Jin,Yijie Wang
An enzyme electrocatalytic p16 protein (AGp16INK4a) immunosensor based on polymethylene blue (PMB) decorated on functional composite modified glassy carbon electrode (PG-GR-CS/GCE) is constructed successfully. The PG-GR-CS having good conductivity and large specific surface area is composed of graphene (GR) doped polycaprolactam 6 (PA6) electrospun nanofibers (PG), GR and chitosan (CS), which could serve as a stable electropolymerization substrate for increasing the amount of PMB. The active catalytic electrode (PG-GR-CS-PMB/GCE) was used as the platform for the construction of an electrocatalytic immunosensor, it can greatly increase the immobilization capacity of AGp16INK4a capture antibody (Ab1), and further catch the AGp16INK4a and horseradish peroxidase-labeled detection antibody (HRP@Ab2) through the sandwich immunoreaction. The PMB decorated on PG-GR-CS/GCE exhibited good electron transfer and electrochemical properties, which could apply as electrocatalytically nanomaterials. Thus, the amplified electrocatalytic response were produced by the reduction of enzymatically oxidized PMB in the presence of hydrogen peroxide via HRP. It was observed that the change of the differential pulse voltammetry of the PMB was proportional to the AGp16INK4a ranging from of 1.0 pg ml−1 to 1.0 ng ml−1. The detection limit was down to 0.5 pg ml−1. The successful immunosensor provides a promising alternative to the electrocatalytic detection of various tumor markers.
研究领域:
生物化学
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生物技术
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电化学
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纳米技术
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癌症研究
✓ 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）