EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Yue Han,Donghao Tang,Guangxing Wang,Ying Guo,Heng Zhou,Wenfeng Qiu,Tong Zhao
Low melting phthalonitrile monomers containing allyl and/or methoxyl groups were designed, synthesized and characterized. In order to evaluate their potential application in phthalonitrile resins, these monomers were blended with 1,3-bis(3,4-dicyanophenoxy)benzene and 4-(4-aminophenoxy)phthalonitrile, then cured into polymers. Curing mechanisms of different prepolymers were proposed and compared, and processability, thermal and mechanical properties were characterized. The introduction of methoxyl units was found to postpone the curing, and thermal properties were slightly compromised. On the contrary, the usage of allyl was beneficial to both processability and thermal properties. More importantly, the impact strength for allyl-containing polymers could be as high as 13.63 kJ m −2 , indicating such resin could be applied as high temperature structural composite matrices.
研究领域:
高分子化学
·
材料科学
·
复合材料
·
热固性树脂
·
高性能聚合物
✓ 已验证
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 24
·2300526
·
IF 29.4
Zhuohua Dai,Guangfa Wang,Fangfang Xiao,Da Lei,Xincun Dou
Amorphous metal-based nanostructures have attracted great attention recently due to their facilitative electron transfer and abundant reactive sites, whereas it remains enigmatic as to whether amorphous copper-based nanoparticles (CuNPs) can be achieved. Here, for synthesizing amorphous CuNPs, glutathione is adopted as a ligand to inhibit the nucleation and crystallization process via its electrostatic repulsion. By subtly tailoring the solvent polarity, not only can amorphous glutathione-functionalized CuNPs (GSH-CuNPs) with phosphorescent performance be achieved after transferring the non-conjugation of GSH ligand to through-space conjugation, namely clusterization-triggered emission, but also the phosphorescence-off of GSH-CuNPs toward 2,4,6-trinitrotoluene (TNT) can be realized by the photoinduced electron-transfer process through the hydrogen bond channel, which is established between carboxyl and amino groups of GSH-CuNPs with the nitryl group of TNT. Benefitting from the intrinsic superiorities of the amorphous CuNPs, desired phosphorescence and detection performances of GSH-CuNPs toward airborne TNT microparticulates are undoubtedly realized, including high quantum yield (13.22%), excellent specificity in 33 potential interferents, instantaneous response, and ultralow detection limit (1.56 pg). The present GSH-CuNPs are expected to stretch amorphous metal-based nanostructures and deepen the insights into amorphous materials for optical detection.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2023
·
IF 3.8
Xian He,Menghao Chen,Jiangbo Lv,Hang Xiao,Hao Wu,Rongtao Zhou,Jianghuai Hu,Ke Zeng,Gang Yang
Aromatic nitriles play an important role in the preparation of high-performance polymers. In order to guide the rational design of new molecules, it is necessary to carry out systematic theoretical research on molecular structures. This article takes a new type of aromatic nitriles, pyrazine-2,3-dicarbonitrile (PQ) and its control group 1,4-dicyanobenzene (PN) as examples to conduct systematic theoretical research on their chemical environments using DFT calculation with experimental verification. Results show that the electronic effect of pyrazine withdraws the electron form cyano to pyrazine, which makes the cyano carbon more exposed and prone to nucleophilic reaction. This electronic deffect also causes the π-electron delocalization from cyano nitrogen to pyrazine, and results in a lower polarity of the cyano and an anomalous law for the 13 C NMR shift of cyano carbon. In addition, pyrazine changes the stacking mechanism of PQ to be dominated by electrostatic force rather than commonly observed dispersion force-dominant π-π stacking in PN. This research method provides important guidance for the design of new crosslinkable aromatic nitrile and help to deepen our understanding of their structure-property relationship.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Yiyuan Tao,Shiying Fan,Xinyong Li,Jing Yang,Jingang Wang,Guohua Chen
Owing to the sluggish reaction kinetics, it is a promising yet challenging task to achieve the adequate electricity-driven catalytic oxidation of biomass-derived 5-hydroxymethylfurfural (HMF) in neutral conditions. Herein, we have prepared an elelctrocatalyst with interfacial coupling effect through in-situ growth of Cu phthalocyanine (CuPc) on Co 3 O 4 spinel (Co 3 O 4 /CuPc), which constructs an effective electrocatalytic system of HMF oxidation with overall oxidation value-added products yield and total Faraday efficiency up to 80% and 70%, respectively. The interfacial coupling effect between CuPc and Co 3 O 4 spinel improve catalytic activity by effectively boosting the interfacial charge transfer and reducing the formation energy of key *C 6 H 3 O 4 in the catalytic pathway according to the in situ Raman spectroscopy and DFT simulation. This work illustrates the significance of interfacial coupling effect for developing highly efficient electrocatalysts applied for neutral system of biomass oxidation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Xia Xing,Ruili Liu,Shaoqing Liu,Suo Xiao,Yi Xu,Chi Wang,Dongqing Wu
In this work, the composites of nitrogen-doped graphene framework and Co 3 O 4 nanoparticles with adjustable morphologies (NG/Co 3 O 4 ) were fabricated via a surfactant-assisted hydrothermal route for first time. Three different surfactants including triblock copolymer F127, cetyltrimethyl ammonium bromide and sodium dodecyl sulfate are involved in the hybrid-assembly of graphene oxide , o -phthalonitrile and cobalt acetate in water/ethanol. Among the obtained samples, the one using F127 (NG/Co 3 O 4 -F127) manifests the most homogeneous distribution of Co 3 O 4 NPs with the size of ∼ 15 nm in the macropore-walls formed by NG. As the anode material in lithium ion battery (LIB), NG/Co 3 O 4 -F127 exhibits excellent electrochemical performance, which is superior to the other composites and most of the previously reported Co 3 O 4 based anode materials in LIBs.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2025
·
IF 11.3
Ruiqi Qiao,Yingxing Li,Rongchao Zhu,Huazangnaowu Bai,Chuanfang Zhao,Baiyi Zu,Zhenzhen Cai
It is of great significance for the discrimination of 2,4,6-trinitrotoluene (TNT) and 2,4,6-trinitrophenol (TNP) from their analogues. Here, based on the electron-deficient properties of TNT and TNP, a series of o-phenylenediamine/polyethyleneimine carbonized polymer dots (OPD/PEI CPDs) with different densities and types of amine groups (-NH 2 ) on the surface were designed by modulating the ratio of the precursors OPD and PEI. The surface -NH 2 group of OPD/PEI CPDs could form a Meisenheimer complex with TNT, triggering the Forster resonance energy transfer, while forming hydrogen bonds with hydroxyl in TNP, triggering the charge transfer and spectral overlap to produce photoinduced electron transfer accompanied with inner filter effect. When the ratio of OPD to PEI is 1:1 and the surface -NH 2 content is 26.06 %, the OPD/PEI 1 CPDs demonstrated a more superior sensing performance toward targets, including a low limit of detection (TNT: 324 nM and 255 µM, TNP: 21.08 nM and 318.6 nM), a rapid response (<1 s), and a rather good selectivity in the presence of 20 interferents. Moreover, the practicality of the OPD/PEI 1 CPDs was further verified by an OPD/PEI 1 CPDs-based paper sensor, which is capable of discriminating TNT and TNP particles and vapors as low as pg-level and ppm-level respectively.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2025
·
IF 4.2
Xinlu Bao,Kebin Ye,Zhikang Song,Mingzhu Zhang,Shaohua Wei,Lin Zhou
Photodynamic therapy (PDT) utilizes reactive oxygen species (ROS) generated by photosensitizers under light to kill cancer cells. The phototoxic index (PI) indicates the safe therapeutic window of photosensitizers, and an ideal photosensitizer should have a high PI. Monosubstituted zinc phthalocyanine (ZnPc-COOH) exhibits excellent phototoxicity in bladder cancer cell (T24, IC 50 = 10.7 nM). However, its localization in mitochondria leads to high dark toxicity (IC 50 = 2.12 μM), resulting in a PI of less than 200. In this study, the binding ability of phthalocyanine to the cell membrane was significantly enhanced by side-chain modification with arginine. By taking advantage of the fluidity of the membrane structure, the drug was transported to the lysosome. After modification with Arg, the dark toxicity of ZnPc-COOH decreased by nearly 100 times, and the PI increased to 8979, which is 12 times that of the clinical photosensitizer Photosens®. In a mouse model of non-muscle-invasive bladder cancer (NMIBC), ZnPc-Arg demonstrated therapeutic effects comparable to those of the clinical drug mitomycin C (MMC). This study provides valuable references for the design of photosensitizers with high PI.
✓ 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）