ACS Applied Polymer Materials
·
2026
·
IF 5.2
Ge Hongwei,Liu Fanqi,Mo Wenjie,Shen Rongji,Zhou Li,Zeng Yanning
Epoxy vitrimers combining recyclability
with advanced
functional
properties represent a key direction for sustainable high-performance
polymers. Herein, we report the design and synthesis of biobased epoxy
vitrimers derived from biobased epigallocatechin gallate (EGCG), a
major green tea polyphenol. An EGCG-based epoxy monomer (EGCG-EP)
was synthesized and subsequently cross-linked with a bifunctional
thiol-containing cross-linker via epoxy-thiol “click”
chemistry, producing a series of epoxy vitrimers (EGB- x ). The abundant aromatic structure of EGCG imparts exceptional multifunctional
properties, including intrinsic flame retardancy (UL-94 V-0 rating,
LOI up to 28.5%), broad-spectrum UV-blocking (full shielding in the
200∼400 nm range), strong antioxidant activity (radical scavenging
efficiency >95% within 10 min), and effective antibacterial activity
against both Staphylococcus aureus and Escherichia coli . Meanwhile, the dynamic boronic
ester bonds enable rapid stress relaxation, efficient self-healing
(95% efficiency), and complete reprocessability under mild conditions
without compromising mechanical performance. The EGB- x also exhibits excellent thermal stability, solvent resistance, and
chemical recyclability, allowing for nondestructive recovery of carbon
fibers from its composites.
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Journal of Coatings Technology and Research
·
2026
·
IF 3.4
Chen Linyang,Xing Zheng,Liu Weiwei,Luo Jing
In this article, a series of acrylic ester copolymer hyperdispersants with different chemical structures (anchoring segments and solvated segments) were designed and synthesized by free radical polymerization and used to disperse mica in UV-curable systems. The influence of anchoring segments and solvated segments of the polyacrylic hyperdispersant on the dispersion of mica in UV-curable coating as well as the coating properties was systematically investigated. The dispersion performance of the hyperdispersants was investigated by rheology measurement, mechanical property, and anticorrosion property (via electrochemical impedance spectroscopy and neutral salt spray test) of the UV-curable coatings. It was found that the optimum anchoring segment and solvated segment of the polyacrylic hyperdispersant for dispersing mica in UV-curable systems were N-isopropylacrylamide (NIPAM) and butyl methacrylate (BMA), respectively. With the addition of p(BMA- co -NIPAM), the viscosity of the UV-curable resin system with mica decreased obviously. Moreover, the negative effect of mica on the mechanical properties of the UV-curable coatings was significantly mitigated, and the coating exhibited outstanding anticorrosion performance. The electrochemical low-frequency impedance value of the coating remains above 10 9.0 Ω cm 2 for 40 days without any decrease. After 1,200 h of neutral salt spray testing, only slight pitting corrosion was observed on the coating surface.
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PROGRESS IN ORGANIC COATINGS
·
2026
·
IF 7.9
Bao Guo,Hongjun Kang,Huiyang Zhao,Xinzhi Wang,Yang Li,Songtao Lu
Low-adhesion superhydrophobic coatings have been considered an effective strategy for mitigating dust accumulation on photovoltaic surfaces, while their long-term outdoor stability under ultraviolet irradiation remains a major challenge. In this work, a dense fluorocarbon layer was deposited onto a SiO 2 –ZnO composite coating by magnetron sputtering to construct a transparent and UV-resistant superhydrophobic dust removal surface. The as-prepared SZ/CF coating exhibits a high water contact angle of 162.8°, a dust removal efficiency of 99.14%, and an average transmittance of 89.67%. After 300 h of UV-B accelerated aging, the coating still maintains superhydrophobicity (150.8°) and high dust removal efficiency (97.01%), demonstrating excellent ultraviolet durability. Mechanistic analysis indicates that the formation of a three-dimensional cross-linked fluorocarbon network suppresses photo-oxidation and preserves the integrity of the low-surface-energy interface. This work provides an effective strategy for developing durable transparent superhydrophobic coatings for long-term photovoltaic dust removal applications.
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LWT-FOOD SCIENCE AND TECHNOLOGY
·
2026
·
IF 7.1
Jian Gao,Jialong Wang,Jiejin Song,Yue Xing,Yuzhao Hou,Fengchao Wang,Jinghui Du,Jiang Wu,Liming Wang
The illegal addition of statins to tea-based products presents significant analytical challenges due to the complexity of the matrices involved. To address these challenges, we developed an ionic liquid-assisted magnetic solid-phase extraction (IL-MSPE) method coupled with HPLC-UV for the simultaneous determination of five statins. This protocol facilitates the rapid batch extraction of analytes within 6 min. The method demonstrated excellent linearity (R 2 ≥ 0.999, 0.1 to 20 μg/mL) and sensitivity, with limits of detection ranging from 0.022 to 0.054 μg/mL, and recovery rates between 89.2% and 117.5%. Density functional theory provided insights into a synergistic “dual-site” recognition mechanism, which is driven by π–π stacking, hydrogen bonding, and electrostatic interactions. Importantly, the method's compliance with green chemistry principles was validated by AGREE (0.77) and MoGAPI (90) metrics. Overall, this proposed workflow represents a reliable and high-throughput tool for monitoring unauthorized statin adulteration.
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FOOD CHEMISTRY
·
2022
·
IF 9.231
Zhiqin Ding,Mengdie Cai,Weimin Gan,Ping Yuan,Lijun Wei,Xianglei Cheng
In this paper, a novel, selective and sensitive high performance liquid chromatography-UV photolysis-fluorescence detection (HPLC-UV-FLD) method for nitrosamines (NAs) is proposed based on terbium-doped carbon dots (Tb-CDs). Experimental studies have shown that nitrosamines can be degraded by UV photolysis with wavelength at 254 nm to produce NO 2 − , while NO 2 − can rapidly and specifically quench the fluorescence of Tb-CDs. Based on this principle, N -nitrosodimethylamine (NDMA), Nnitrosomorpholine (NMor), N -nitrosopyrrolidine (NPYR), N -nitrosodiethylamine (NDEA) and N -nitrosopiperidine (NPIP) are separated within 8 min by HPLC. These five kinds of NAs showed a good linear relationship in the range of 10–2000 μg/L, and the limit of detection was as low as 2.25 μg/L. The proposed method is successfully applied to the detection of sweet potato, lotus root, potato, water chestnut, tomato and cucumber. The sample recoveries range from 77.35 % to 119.3 %.
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JOURNAL OF PHARMACEUTICAL AND BIOMEDICAL ANALYSIS
·
2022
·
IF 3.571
Xueni Zhong,Qianqian Lv,Qiyun Yong,Wenping Hu,Dan Li,Shuhui Ji,Liuyue Zhan,Wenbin Chen,Min Li,Jinsheng Lin,Cuirong Sun
Elagolix sodium (ELS) is a marketed product using to release moderate to severe endometriosis-associated pain. It contains functional groups such as carboxyl group , secondary amino group , 2,4-dioxo pyrimidinyl and several benzyl or benzyl-like position hydrogen atom that are susceptive to occur stress degradation. Forced degradation studies of ELS reveal different degradation profiles of the drug substance which are conducted under photo, thermal, acidic, neutral, alkaline and hydrogen peroxide oxidative conditions in the direction of the ICH guidances. With structural elucidation of LC-PDA/UV-MS n and NMR, the degradants were identified, and seven new degradants are reported in this study. It is confirmed that most of the degradation behaviors of ELS are related to the carboxyl group and secondary amino group in the 3-carboxyl propylamine side chain. Under the oxidative condition using hydrogen peroxide as the oxidant , the secondary amine was oxidized to form an N -hydrogen amine degradant and two further degradants of amine and carbonyl analogs were generated. Under the alkaline degradation condition, the ELS is proven to be stable and no obvious degradants are produced. On the other hand, under the acidic and neutral degradation condition, the 2,4-dioxo pyrimidinyl core of elagolix sodium is stable but the carboxyl group and secondary amine will occur ring cyclization to form the δ -lactam analogs of elagolix sodium. The plausible mechanisms for the degradation of acidic, thermal, photo-degradative and hydrogen peroxide mediated oxidative of elagolix sodium are proposed. It is worth to note that DP-3–4 are the potential degradants which are only found in the solution degradation and are not the real impurities of elagolix sodium.
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CHEMICAL PAPERS
·
2022
·Vol. 77
·期 3
·1631-1644
·
IF 2.146
Zuo Xiong Jun,Liu Jinhui,Gu Feng Long
A new method of how to use high concentrations of UV–Vis absorbable components in mobile phases for ion chromatographic separation of anions with indirect photometric detection (IPD) was developed. The UV–Vis absorption curves, the signal strengths at selected wavelengths, and the response ranges at different wavelengths of three organic salts, sodium benzoate, sodium 4-nitrobenzoate and sodium 3,5-dinitrobenzoate were detected using a photodiode array detector. Mobile phases containing these three organic salts at concentrations as high as 20 mM were used for ion chromatographic separations of inorganic anions, such as F − , Cl − , NO 2 − , Br − , NO 3 − , and SO 4 2− . Separation characteristics detected at different wavelengths such as, the baseline stability, signal to noise levels shown as detection limits, linearity, etc., were investigated. It is found that the best wavelength used for IPD may not be the maximum or near the maximum absorption wavelength, but definitely not the non-absorptive wavelength of the eluent. Therefore, the best wavelength should be optimized. With the optimized wavelength at 385 nm, anions of sub-nanomoles were able to be quantitatively detected, and a good linear relationship with a correlation coefficients, ( r > 0.9998), within the sample ranges from 0.5 to 200 ng was available. By using the optimized wavelength, the threshold of the detector will no longer be a strict restriction factor of using high concentrations of UV–Vis absorbable components. Consequently, columns with different ion exchange capacities can be used for separations with IPD. Furthermore, because the separation system can be fast re-equilibrated after sample injection using high concentrations of monovalent ion eluent, the separation efficiency can be highly improved. This method is promising for developing mobile phases for other chromatographic separations with IPD.
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CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Bingbing Cui,Chuanpan Guo,Zhihong Zhang,Guodong Fu
Photochromic hydrogels, which are dynamic in response to external light stimuli, have aroused increasing attentions due to their potential applications in intelligent devices. However, achieving excellent photochromic activity with fast photoresponse and self-bleaching rates still remains a huge challenge. Herein, a novel photochromic junction of zinc-based metal–organic framework (Zn-MOF) and tungsten oxide (WO 3 ) was established as photochromic unit and embraced within hydrogel of poly(acrylic acid- co -polyethylene glycol) [P(AA/PEG)] via the interaction of ionic and hydrogen bonding (denoted as P(AA/PEG)-Zn-MOF@WO 3 ), following by exploiting as self-bleaching photochromic agent for assembling UV-irradiated smart rewritable device. The photoinduced electrons can be efficiently separated and migrated from Zn-MOF to WO 3 in the Zn-MOF@WO 3 junction after UV irradiation, thereby increasing the coloration degree. Due to the enhanced fast response to light stimuli, the P(AA/PEG)-Zn-MOF@WO 3 -3 hydrogel prepared using 200 mg Zn-MOF demonstrated the fast responsive photochromic behavior of 10 s under UV lamp illumination and the self-fading process could be easily performed in room condition (within 20 min). Moreover, the coloration degree of P(AA/PEG)-Zn-MOF@WO 3 -3 photochromic hydrogel was precisely controlled and repeated by changing the UV irradiation time. Consequently, the fast photochromic and self-fading properties of P(AA/PEG)-Zn-MOF@WO 3 -3 afforded rapid and easy ‘‘writing’’ and “erasing” abilities. The present work proposes a new way for the construction of the reversibly responsive photochromic hydrogel with smart optical materials, further broadening their applications in intelligence sensors, smart windows, and flexible memory devices.
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CHEMOSPHERE
·
2022
·
IF 8.943
Huiwang Dai,Xiaozeng Miao,Jianxi Zhu,Jianxin Chen
The redox cycle of iron is a well-known rate-determining step for hydroxyl radical generation in photo-Fenton system. In this study, oxalate was employed as regulator to enhance the degradation of Orange II in Fe 3 O 4 magnetic nanoparticles (NPs)-catalyzed heterogeneous UV-Fenton system. Results showed that the oxalate could interact with the surface ≡Fe III species of catalyst, which weakened the bond of ≡Fe III –O and promoted the leaching of iron ions. Then the redox cycle of iron and generation of HO· would be accelerated via the homogeneous UV-Fenton reaction. The degradation rate constant of Orange II reached 0.220 min −1 when additional oxalate concentration was 0.4 mM, which was 2.5 times as high as that without oxalate in heterogeneous UV-Fenton system. In this case, the removal efficiencies of color and TOC were 99.3% and 92.0% after 30 and 120 min treatment, respectively. In addition, based on the results of XRD and XPS characterization, it could be deduced that the crystal structure and elemental configuration of Fe 3 O 4 magnetic nanoparticles could be maintained after reaction. Besides, the results of FTIR and magnetization characterization indicated that the C 2 O 4 2− on surface of catalyst could be degraded and the catalyst could be easily separated from aqueous by applying an external magnetic field. The Fe 3 O 4 magnetic nanoparticles showed high catalytic stability and reusability under the regulation of oxalate due to the fact that the leached iron ions could be re-adsorbed on the catalyst after treatment.
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ENVIRONMENTAL RESEARCH
·
2021
·
IF 6.498
Li Li,Ruoning Guo,Sai Zhang,Yiming Yuan
In recent decades, sodium percarbonate (SPC) has been widely applied as a solid replacement for H 2 O 2 in advanced oxidation process (AOPs). In this study, ultraviolet (UV) light was utilized for SPC activation to investigate the aniline degradation performance. The effects of SPC dosages and UV irradiation on aniline degradation were elaborated. The removal efficiency was significantly improved by increasing either the SPC dosage or UV irradiation intensity. Moreover, scavenging experiments showed that •OH, CO 3 •− , and O 2 •− were the predominant reactive species for aniline degradation. Meanwhile, the variation in the amount of •OH in the UV/SPC system was monitored, which revealed the dominant role of •OH. As a result, the mechanism of aniline degradation by the UV/SPC system was demonstrated based on confirmed free radicals. Furthermore, aniline degradation by the UV/H 2 O 2 and UV/H 2 O 2 /Na 2 CO 3 system were compared with the UV/SPC system, and an enhancement by the addition of Fe(II) in the UV/SPC system was verified. Aniline degradation was not significantly affected by the initial pH or the presence of Cl − , SO 4 2− while NO 3 − , HCO 3 − and humid acid (HA) suppressed the reaction. In general, the UV/SPC system is a novel, green, and promising technology for aniline removal from aqueous solutions.
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RSC Advances
·
2021
·Vol. 11
·期 48
·30102-30108
·
IF 3.361
Setareh Rostami-Javanroudi,Masoud Moradi,Kiomars Sharafi,Nazir Fattahi
In the present research, several novel and natural hydrophobic deep eutectic solvents (DESs) were prepared using methyltrioctylammonium chloride (MTOAC) as the hydrogen bond acceptor (HBA) and different types of straight chain alcohols as hydrogen bond donors (HBDs). One of the DESs composed of MTOAC and n-butanol was advantageously used to develop a vortex-assisted liquid phase microextraction (VALPME) method combined with high-performance liquid chromatography-ultraviolet detection (HPLC-UV) for the determination of common acaricides in fruit juice samples. Several important parameters influencing extraction efficiency were investigated and optimized, including the type and volume of DES, sample solution pH, effect of salt addition and, extraction and vortex time. Under optimal experimental conditions, the method showed good linearity with the correlation coefficients (R2) of 0.9986–0.9991 in the linear range of 2–300 μg L−1, low limits of detection of 0.5–1 μg L−1 and acceptable extraction recoveries in the range of 85–93%. The proposed method was successfully applied for the extraction and preconcentration of trace acaricides in real fruit juice samples, and the results demonstrated the potential of the synthesized DESs for the extraction and determination of contaminants in aqueous samples.
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Nanoscale
·
2021
·Vol. 14
·期 6
·2199-2209
·
IF 7.79
Potao Sun,Fengqi Liu,Wenxia Sima,Tao Yuan,Ming Yang,Chen Liang,Mingke Zhao,Ze Yin
During the long-term operation of solid insulation materials, strong electric fields and mechanical stress cause electrical trees and cracks that are undetectable and irreversible, leading to the failure of electronic and electrical devices. A promising means of protecting against these problems is to endow the insulating materials with some self-healing capability alongside their excellent intrinsic properties. However, this has proved extremely challenging. In this paper, we describe an ultraviolet light, moisture, and magnetic field triple-response microcapsule that enables epoxy resin materials to heal themselves against various forms of damage without affecting the intrinsic performance of the matrix. In particular, microcapsules wrapped inside functional shells containing Fe3O4 nanoparticles are precisely controlled by a targeted magnetic field and distributed in the vulnerable area of the insulation materials, resulting in a high healing rate at low doping concentrations. Using the in situ ultraviolet light emitted by the electrical trees, artificial ultraviolet light, and moisture in the operating environment, it is possible to induce active or passive curing of the healing agent, thus realizing the intelligent, non-contact, and targeted self-healing of mechanical cracks and electrical tree damage. This method opens an avenue toward the development of self-healing insulation materials for electrical and electronic applications.
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