JOURNAL OF CHROMATOGRAPHY A
·
2024
·
IF 3.8
Qidong Yu,Wenmin Zhang,Jingyi Wang,Shiye Xie,Baodi Liao,Hui Chen,Qingqing Ding,Lan Zhang
Design and preparation of fiber coatings with excellent electrochemical performance and high polarity is significant for efficient extraction of polar targets in electro-enhanced solid-phase microextraction (EE-SPME). In this work, a combination strategy for structure regulation of covalent organic framework (COF) was proposed to fabricate a nitrogen-rich thiocarbamide linked COF coating (Thiocarbamide-TZ-DHTP) via molecular design and post-synthetic thiocarbamide conversion. The prepared COF coating possesses a large number of O, N, and S functional groups, which not only endow the coating with higher polarity but also significantly enhance its electrochemical performance. The COF coating was used for EE-SPME of polar bisphenols (BPs), demonstrating excellent enrichment efficiency and durability. Subsequently, coupled with gas chromatography-tandem mass spectrometry (GC-MS/MS), a sensitive method was developed for determination of trace BPs. The established method possess wide linear ranges (2.0–800.0 ng L −1 ), good correlation coefficients (0.9985–0.9994) and low detection limits (0.1–2.0 ng L −1 ). Moreover, the established method had been successfully applied to detection of trace BPs in tea beverage with satisfactory recoveries (81.6 % to 118.6 %). This research provides a feasible pathway for preparing COF coating with excellent electrochemical performance and high polarity for EE-SPME.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 59
·期 18
·2057-2068
·
IF 0
Zizhao Qian,Qing Li,Lujie Wang,Feiya Fu,Xiangdong Liu
As a renewable chemical, diphenolic acid (DPA) has attracted immense interest in bio-based polymer science. However, its application for polybenzoxazines is limited due to decarboxylation, that is, the release of CO 2 during the curing reaction of benzoxazine. In this study, the amidation strategy of converting DPA to diphenolic amides (DPAM) was demonstrated to solve this problem while simultaneously improving the thermal properties of polybenzoxazine. DPA was amidated by separately using four amines (hexamine, cyclohexylamine, furfurylamine, and aniline), then reacted with furfurylamine and paraformaldehyde to synthesize their benzoxazine monomers. By using TGA and DMA, all amide-containing polybenzoxazines were found to exhibit excellent thermal stabilities. Among all of the benzoxazine resins, poly(DFA-fa), which was obtained from amidation with furfurylamine, exhibited the highest glass transition temperature ( T g ) of 310°C and a decomposition temperature ( T d10 ) of 406°C. Furthermore, a possible post-curing reaction mechanism was proposed to explain the outstanding thermal performance of poly(DFA-fa) resin. This study proposes an innovative strategy to solve the decarboxylation of DPA-based polymers, which is of significance for high-performance bio-based polymers. Graphical
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
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Zizhao Qian,Yuanxiang Xiao,Xujun Zhang,Qing Li,Lujie Wang,Feiya Fu,Hongyan Diao,Xiangdong Liu
Bisphenol A (BPA) is the main precursor in the synthesis of epoxy resins. However, because of its toxic and nonrenewable nature, BPA is unsuitable in the sustainable preparation of epoxy resins. In contrast, Diphenolic acid (DPA) is renewable but its carboxyl group limits its applications in bio-based thermosets. In this study, we report a novel amidation route to tailor DPA to produce epoxide monomers that present epoxy resins with a high performance. The diphenolic amides exhibited very low toxicities when compared with that of BPA, and also provided an unexpected autocatalytic effect on the curing reactions when succinic anhydride (SA) was used as the hardener. Dynamic mechanical analyses (DMA) and tensile test results confirmed the remarkable thermomechanical properties of the cured epoxy resins, which may be attributed to the increased cross-linking density and enhanced hydrogen bonding by the amide groups. Among the SA-cured epoxy resins, diglycidyl ether of diphenolic ethylamide exhibited the best performance, which included a high T g of 114 °C, char yield (CY) of 20%, tensile strength of 60.2 MPa, and toughness value of 185 MPa. In addition, the DPA-derived epoxy resins have great potential in the preparation of bio-based composites because they act as excellent interfaces between the resin and cotton fibers (CoFs). Our study presents a new strategy to prepare bio-based epoxy resins with a high performance, emphasizing the greater potential of amidated DPA derivatives to replace BPA in the epoxy resin market.
研究领域:
材料科学
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化学工程
·
可再生资源利用
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 30
·期 9
·2207-2220
·
IF 2.162
Benjamin Tawiah,Bin Yu,Wei Yang,Richard K.K. Yuen,Bin Fei
Poly (lactic acid) (PLA) has become an important biopolymer with excellent properties but has limited engineering applications where fire safety is ultimate. An efficient flame retardant (FR) for PLA biocomposites based on azo-boron coupled with 4,4′-sulfonyldiphenol-(((1E,1′E)-(sulfonylbis(6-hydroxy-3,1-phenylene))bis (diazene-2,1-diyl))bis(3,1-phenylene))diboronic acid (SBDA) was synthesized and characterized by FTIR, 1 H and 13 C NMR spectra. SBDA was combined with calcium lignosulfonate (Calig) and compounded with PLA, and the FR, crystallization, and mechanical properties were investigated. The addition of 15 wt% FR (10 wt% Calig and 5 wt% SBDA) into PLA led to important reductions in peak heat release rate (PHRR) approximately 54%, total heat release (THR) approximately 28.6%, and the average effective heat of combustion (AEHC) approximately 29.4%. The fire performance index and fire growth index improved by approximately 56.4% and 33.1%, respectively. A V-0 rating (vertical burning test) and a limiting oxygen index value of 28.8% were achieved for the FR PLA biocomposites. The combinatory SBDA/Calig reduced the segmental mobility of PLA in the organic-inorganic interface with insignificant changes in the elongation at break and the Young Modulus. TG-IR study showed significant reductions in pyrolysis gaseous products for the composites compared with PLA. This research work will expand the frontiers of knowledge on use of boron and calcium functionalized polyaromatic polyols for reducing the flammability of PLA.
研究领域:
材料科学
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化学工程
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生物材料
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2025
·Vol. 19
·期 5
·1-14
·
IF 6.4
Li Ping,Huang Xiaojiang,Yang Qing,Xia Haozhe,Li Chunbo,Zhang Zhiqiang,Wang Xuan,Lu Jinsuo
The activation of oxygen by ferrous (Fe 2+ ) to generate ·OH for contaminants degradation was inhibited due to the low utilization of oxygen, thus limiting its application in the practical environment. In this study, with the superior oxygenation capacity of micro-nano bubbles (MNBs) and the stronger O 2 activation capacity of Fe 2+ -oxalate complexes, the MNBs/Fe 2+ /oxalate (Ox) system was constructed with 4,4′-sulfonyldiphenol (BPS) as the main target emerging contaminants (ECs), and to investigate the enhancement contribution and reinforcement mechanism of the involvement of MNBs to the removal efficiency of ECs in the Fe 2+ /Ox system. It was shown that the MNBs/Fe 2+ /Ox system could effectively degrade four structurally diverse ECs. In this case, with BPS as the main target contaminant, adding MNBs could increase the BPS removal efficiency by about 35%. In the MNBs/Fe 2+ /Ox system, the degradation rate of BPS depended on the concentration of Fe II (Ox) 2 2− , while the extent of degradation was mainly governed by Fe II (Ox) 2 2− and Fe II (Ox) 0 . EPR and probe experiments showed that the reactive oxygen species (ROS) produced by the system and the iron hydroxide complexes produced by Fe 3+ hydrolysis contributed to the degradation of BPS by oxidation and coagulation, respectively. In particular, ·OH and O 2 •− were the main reactive oxygen species produced by this system. Moreover, the involvement of MNBs significantly increased the formation of ROS and iron hydroxide complexes in the Fe 2+ /Ox system. The oxygenation process of MNBs used in this study enhanced the contaminants degradation performance of the Fe 2+ /Ox system and has broadened the application scope of MNBs.
研究领域:
环境科学
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化学工程
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2013
·
IF 0.85
Chaoyun Luo,Jiandong Zuo,Jianqing Zhao
An epoxy prepolymer with high refractive index, diglycidyl ether of thiodiphenol (DGETP), was synthesized by 4,4′-thiodiphenol and epichlorohydrin via a two-step method. The curing agent o-benzenedimethanethiol (OBDMT) was synthesized by thiourea method. Fourier transform infrared spectroscopy and proton nuclear magnetic resonance were employed to characterize the structures of these resins. The cured product of DGETP and OBDMT was analyzed by differential scanning calorimetry, ultraviolet–visible spectrometer, and Abbe refractometer and compared with the property of traditional curing agent of methyl hexahydrophthalic anhydride (MHHPA) and ordinary bisphenol A diglycidyl ether epoxy prepolymer cured products. The lower curing temperature and glass transition temperature of DGETP than those of MHHPA can be mainly attributed to the strong rotation capability of thioether bond. The zero light transmittance region of DGETP/OBDMT curing adhesive (200–380 nm) was broader than that of the other three. The refractive index of DGETP/OBDMT was up to 1.654.
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2020
·
IF 4.032
Zhiyuan Chi,Zongwei Guo,Zice Xu,Mengjie Zhang,Ming Li,Lei Shang,Yuhui Ao
Searching a renewable and flame-retardant alternative to bisphenol A epoxy resins is a necessary development trend. Diphenolic acid , a plant derivative, has been proven to be one of the sustainable alternatives to bisphenol A. However, how to impart the flame-retardant property to diphenolic acid thermosets is still a challenge to synthesize high performance intrinsic flame-retardant bio-based epoxy resins. A flame-retardant bio-based epoxy resin (TEBA) was designed and synthesized via a three-step synthetic pathway from 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO)、diethanolamine and diphenolic acid (DPA). The chemical structures of the intermediate and final products were confirmed by 1 HNMR and FTIR spectroscopy. TEBA cured with 4,4′-diaminodiphenylmethane (DDM) curing agent was compared with a standard bisphenol A epoxy resin (DGEBA). Due to the combination of phosphorus and nitrogen in the main chain, the TEBA-DDM shows superior flame retardancy. Compared with DGEBA-DDM, LOI of TEBA-DDM increased from 25.8% to 42.3%, UL-94 test rating from no rating to V-0 rating, self-extinguishing within 3s. The peak heat release rate (PHRR) in the cone calorimetry test decreased by 67%. total heat release (THR) and total smoke generation (TSP) decreased by 27% and 35%, respectively. In addition, the flame retardant mechanism of TEBA epoxy thermosets was researched by FTIR, residual char photograph, SEM, TG-IR analysis and Raman spectroscopy . Meanwhile, TEBA-DDM and DGEBA-DDM have comparable mechanical properties .
研究领域:
材料科学
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化学工程
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高分子科学
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可持续化学
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产品关联
DOI
高影响因子
Frontiers in Aging Neuroscience
·
2024
·
IF 4.1
Yu Xingzhi,Tao Jie,Xiao Tian,Duan Xiaohua
Introduction: Gastrodia elata Blume is a widely used medicinal and edible herb with a rich chemical composition. Moreover, prescriptions containing Gastrodia elata are commonly used for the prevention and treatment of cardiovascular, cerebrovascular, and aging-related diseases. Recent pharmacological studies have confirmed the antioxidant and neuroprotective effects of Gastrodia elata, and, in recent years, this herb has also been used in the treatment of Alzheimer’s disease (AD) and other neurodegenerative disorders. We have previously shown that 4,4′-methylenediphenol, a key active ingredient of Gastrodia elata, can mitigate amyloid-β (Aβ)-induced paralysis in AD model worms as well as prolong the lifespan of the animals, thus displaying potential as a treatment of AD.Methods: We investigated the effects of 4,4′-methylenediphenol on AD and aging through paralysis, lifespan, and behavioral assays. In addition, we determined the anti-AD effects of 4,4′-methylenediphenol by reactive oxygen species (ROS) assay, lipofuscin analysis, thioflavin S staining, metabolomics analysis, GFP reporter gene worm assay, and RNA interference assay and conducted in-depth studies on its mechanism of action.Results: 4,4′-Methylenediphenol not only delayed paralysis onset and senescence in the AD model worms but also enhanced their motility and stress tolerance. Meanwhile, 4,4′-methylenediphenol treatment also reduced the contents of reactive oxygen species (ROS) and lipofuscin, and decreased Aβ protein deposition in the worms. Broad-spectrum targeted metabolomic analysis showed that 4,4′-methylenediphenol administration had a positive effect on the metabolite profile of the worms. In addition, 4,4′-methylenediphenol promoted the nuclear translocation of DAF-16 and upregulated the expression of SKN-1, SOD-3, and GST-4 in the respective GFP reporter lines, accompanied by an enhancement of antioxidant activity and a reduction in Aβ toxicity; importantly, our results suggested that these effects of 4,4′-methylenediphenol were mediated, at least partly, via the activation of DAF-16.Conclusion: We have demonstrated that 4,4′-methylenediphenol can reduce Aβ-induced toxicity in AD model worms, suggesting that it has potential for development as an anti-AD drug. Our findings provide ideas and references for further research into the anti-AD effects of Gastrodia elata and its active ingredients.
研究领域:
神经科学
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药理学
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老年学
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分子生物学
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代谢组学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2025
·
IF 9
Ning Yu,Tianxiang Wang,Mengfan Wang,Niamat Ullah,Qiyu Duan,Bo Wu,Genghao Gong,Yunxia Hu,Shao-Lu Li
Organic solvent nanofiltration (OSN) is a promising, energy-efficient separation technique for molecular separations and solute enrichment in organic media. However, the facile construction of high-performance and stable OSN membranes remains a persistent challenge. Here, we report a newly developed microporous composite membrane with exceptional perm-selectivity, achieved by employing a new aqueous phase monomer, 9,9-bis(3-amino-4-hydroxyphenyl)fluorene (BAHPF), which features two amino and two phenolic reactive groups, through interfacial polymerization (IP) with trimesoyl chloride (TMC). Ultrathin polyesteramide nanofilms with thicknesses less than 20 nm were achieved. The rigid, twisted, and multifunctional characteristics of BAHPF monomer endowed the resulting polyesteramide layer with significantly improved microporosity and a highly interconnected polymeric network voids. As a result, the optimized BAHPF/TMC membrane demonstrated a methanol permeance of up to 17.9 ± 1.8 LMH/bar, while preserving a low MWCO of 298 Da, surpassing the performance of most reported polymeric OSN membranes. Furthermore, the membrane exhibited excellent long-term operational stability and achieved high retention capacities (>98 %) for three model small-molecule drugs. Notably, the heat-sensitive drug rifampicin was effectively concentrated by ∼14-fold, from 50 ppm to ∼700 ppm, within 5 h. Overall, this work offers novel insight into the material design approach for developing next-generation high-performance organic solvent nanofiltration membranes.
研究领域:
膜科学
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高分子科学
·
分离技术
·
纳滤
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Shun Yang,Zhigang Hao,Shaohua Zhang,Yanjun Gao,Xiangyang Li,Jiong Peng,Lijie Li,Xin Li
An exquisitely designed nanostructure and hybridizing with heteroatom-doped carbon can significantly improve the electrochemical performance of the transition metal sulfides (TMSs). Herein, three-dimensional (3D) hollow N, P, S codoped carbon (NPSC) shells encapsulated with uniformly dispersed cobalt sulfide nanoparticles (Co1–xS/HNPSCS) are synthesized for supercapacitors (SCs) by the sulfuration and carbonization of poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS)-functionalized cobalt-based zeolitic imidazolate framework-67 (ZIF-67). The PZS protects the ZIF-67 from collapsing and convert it in situ into NPSC shells, which are conducive to exposing abundant active sites and accelerating the kinetics of electrochemical reactions. As a result, the Co1–xS/HNPSCS presents an unrivaled specific capacity of 1058.9 C g–1 at 1 A g–1. The assembled Co1–xS/HNPSCS//AC hybrid SC (HSC) demonstrates a remarkable energy density of 57.8 W h kg–1 at a power density of 375 W kg–1. Density functional theory calculations show that the synergy between the Co1–xS and NPSC can optimize the electronic configuration, improve the conductivity, and enhance the adsorption of OH– on the surface of the electrode material. Besides, the quantum capacitance of the carbon layer is also increased by N, P, S codoping. This work exhibits an effective strategy to fabricate TMS/HNPSCS and offers theoretical and methodological guidance for the study of NPSC coating materials.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
DOI
高影响因子
APPLIED RADIATION AND ISOTOPES
·
2022
·
IF 1.787
Yunyun Bao,Yan Liu,Changfu Wang,Yun Wang,Dingzhong Yuan,Jianda Xu,Zuqing Zhu,Yan He,Jinbiao Liu
The adsorption and recovery of uranium from wastewater is of positive significance to the development of nuclear industry and environmental remediation. The ternary polymer (PZS-co-TA) was prepared from hexachlorocyclotriphosphazene (HCCP), 4,4-sulfonyldiphenol (BPS) and tannic acid (TA) under ultrasonic . TAC was then obtained after carbonization under high temperature from PZS-co-TA. The structure and performance of TAC were analyzed using SEM , EDS, FT-IR, XRD, Raman, BET and TG. The adsorption capacity of TAC for uranium under different static adsorption conditions was investigated. The adsorption process was more consistent with pseudo-second-order model. The maximum adsorption capacity calculated by non-linear Langmuir model was 492.5 mg/g at pH 5.5. The thermodynamic values suggested that the adsorption process was spontaneous and endothermic. Moreover, after five cycles of adsorption-desorption tests, TAC remained effective at adsorbing uranium, implying the introducing of TA to the precursor (PZS-co-TA) could enhance the adsorption capacity for uranium.
研究领域:
环境科学
·
材料科学
·
核工程
✓ 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）