POLYMER
·
2016
·
IF 3.586
Ping Yuan,Suchun Ji,Jianghuai Hu,Xueping Hu,Ke Zeng,Gang Yang
Blends of phthalonitrile ( CN ) and alicyclic imide compounds synthesized from tetrahydrophthalic anhydride ( CC ), methyl tetrahydrophthalic anhydride ( MCC ) and hexahydrophthalic anhydride ( HCC ), respectively, were prepared and characterized. Results from rheological studies demonstrated the scope of a novel Thermal Synergistic Polymerization (TSP) effect between phthalonitrile and the alicyclic imide compounds. FTIR data showed a unique phenomenon, which is, the C N of the phthalonitrile compound could be completely and rapidly consumed without generating any triazine ring. Further works on cured products of CC / CN system showed comparable or even higher thermal oxidation stability, low boiling water absorbance and moderate dielectric constant ( ε′ in the range of 4.8∼4.5) with almost no voids compared with that of the phthalonitrile resins promoted by traditional curing system of active hydrogen. Model system was designed to study the mechanism of TSP effect of alicyclic imide moiety/phthalonitrile. The systematic characterizations by FTIR, UV–Vis, MALDI-TOF MS, free radical scavenger (DPPH), EPR , etc. showed that the TSP reaction undergoes both copolymerization and homopolymerization with no triazine formation, involving a free radical process. Structural analysis of the oligomers suggested that phthalocyanine rings were a minor component of the thermoset networks, while polyisoindolines were the primary structural motif.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Kanagaraj Rajalakshmi,Selvaraj Muthusamy,Meng Xie,Yun-Sik Nam,Byeong-hyeon Lee,Kang-Bong Lee,Yuanguo Xu,Jimin Xie
The accumulation of mercury in the food chain and environment is harmful to living beings. This raises the need for high affinity, reusable cost-efficient adsorbents for mercury. Herein, we report a side chain entanglement free hetero atom effect bearing covalent organic framework MTF prepared by integrating melamine and thiophene linker. The AA stacked MTF-2 was prepared via transformation strategy from its AB stacked MTF-1 congener. The MTF-1 and MTF-2 were comprehensively analyzed through PXRD, SEM, TEM, 13 C CP/MAS, N 2 sorption and mercury removal efficiency. The adsorption capacity of MTF-2 revealed a value of 540 mg g −1 , which is greater than that of MTF-1 (328 mg g −1 ). The adsorption mechanism was studied through XPS, 13 C CP/MAS and XAFS indicating probable coordination of Hg 2+ with both the triazine and sulfur moieties in a cooperative manner. To demonstrate the role of aromatic triazine ring, the analogous aliphatic triaminoguanidine was selected and the removal efficiencies between triaminoguanidine-thiophene COF (TAG-TF) and MTF-2 were compared. It revealed that the triazine unit containing MTF-2 showed 2.2 times greater removal efficiency than TAG-TF. The results reveal the structure-performance relationship, where the high surface area and relatively ordered functional moieties both paly a synergistic role in efficient mercury adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 38
·e52920
·
IF 3.057
Wei Wang,Li Lei,Qiuru Bao,Yuan Liu,Qi Wang
The flame retardant work of polyolefin materials has always been a challenge in the industry. Herein, we report a triazine charring agent (TM) containing hydroxyl and triazine ring. Combined with ammonium polyphosphate (APP), TM was applied to prepare flame retardant thermoplastic polyolefin (TPO) composites. The results of thermogravimetric analysis (TGA) test show that TM has high initial pyrolysis temperature and retention rate of char residue at high temperature. The UL-94, limit oxygen index (LOI) and cone calorimetry tests (CCT) were used to characterize the flame retardancy of TPO composites. The UL-94 V-0 rating and LOI value of 29.2% are achieved with a loading of 9.17 wt% flame retardant (TPO-3). In particular, the fire performance index (FPI) associated with the flashover time also increases to 0.037 m 2 s/kW compared with TPO (0.030 m 2 s/kW). The synergistic effects of APP/TM were investigated in depth. The results show that APP/TM system forms a dense and continuous char layer on the surface of TPO during combustion, which effectively insulates the substrate from heat and oxygen erosion. Additionally, APP/TM system also plays a weak but important flame retardant role in the gas phase, including quenching effect of phosphorous compounds and dilution effect of non-combustible gases.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xin-Long Sha,Xiu-Zhi Yang,Suping Fang,Zhenyu Yang,Zongtang Liu,Zhenghao Fei
The preparation of halogen-free and phosphorus-free flame retardant thermosetting resins from simple biobased feedstocks is important for both environmental sustainability and practical industrial applications. Meantime, high performance thermoset resins need to have excellent heat resistance and mechanical properties. In this paper, the allyl monomers TAMT and TEC with s-triazine rings were synthesized from the basic biobased substrates vanillin and eugenol via simple synthetic route without column chromatographic purification throughout the reaction, and the structures of the monomers were investigated by nuclear magnetic resonance (NMR) and high-resolution mass spectrometry (HRMS). Then TAMT and TEC were copolymerized with bismaleimide to produce the thermosetting resins poly(TA/B) and poly(TE/B) . Subsequently, the thermal, mechanical and flame retardant properties of the resins were investigated in detail, meanwhile, possible flame retardant mechanisms had also been put forward. The results showed that the newly produced s-triazine ring thermosetting resins poly(TA/B) exhibited excellent overall performance, specifically in terms of excellent heat resistance and mechanical properties, the glass transition temperature of the newly produced resin was more than 400 °C, and the initial thermal decomposition temperature was 434 °C, poly(TA/B) also exhibited excellent flame retardant properties, with reaching the UL94 V-0 level. The total heat release (THR) value was 6.9 kJ/g, which was much lower than that of the commercial bismaleimide resin (34.5 kJ/g). Using simple biobased feedstocks, halogen-free and phosphorus-free thermosetting resins with excellent heat resistance, mechanical properties, and flame retardancy were produced, which provided ideas and data support for the preparation of green and high-performance thermosetting resins.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
WATER RESEARCH
·
2017
·
IF 6.942
Xing Ding,Shengyao Wang,Wanqiu Shen,Yi Mu,Li Wang,Hao Chen,Lizhi Zhang
In this study, an electrochemical/electro-Fenton oxidation (EC/EF) system was designed to degrade atrazine, by utilizing boron-doped diamond (BDD) and Fe@Fe 2 O 3 core-shell nanowires loaded active carbon fiber (Fe@Fe 2 O 3 /ACF) as the anode and the cathode, respectively. This EC/EF system exhibited much higher degradation rate, decholorination and mineralization efficiency of atrazine than the electrochemical (EC) and electrochemical/traditional electro-Fenton (EC/TEF) oxidation counterpart systems without Fe@Fe 2 O 3 core-shell nanowires. Active species trapping experiment revealed that Fe@Fe 2 O 3 could activate molecular oxygen to produce more OH through Fenton reaction, which favored the atrazine degradation. High performance liquid chromatography , high performance liquid chromatography-mass spectrometry and gas chromatography-mass spectrometry were applied to probe the decomposition and mineralization of atrazine during this novel EC/EF process, which revealed that two intermediates of triazinons (the isomerization of hydroxylated atrazine) were generated during the electrochemical/electro-Fenton oxidation of atrazine in the presence of Fe@Fe 2 O 3 core-shell nanowires. The experimental and theoretical calculation results suggested that atrazine might be degraded via a triazinon ring opening mechanism, while the presence of Fe@Fe 2 O 3 notably accelerated the decholorination process, and produced more hydroxylated products to promote the generation of trazinons and the subsequent ring cleavage as well as the final complete mineralization. This work provides a deep insight into the triazine ring opening mechanism and the design of efficient electrochemical advanced oxidation technologies (EAOTs) for persistent organic pollutant removal .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 31
·17658-17663
·
IF 3.049
Xiong Wei,Ma Wei,Zhang Shufen
Herein, a new kind of hetero-bifunctional reactive dyes with high light-fastness was designed and synthesized by introducing benzene sulfonamide and its derivatives into the triazine ring. Benzene sulfonamide or its derivatives and 2-amino-5-naphthol-7-sulfonic acid (J-acid) were condensed with cyanuric chloride to synthesize coupling components, which were then coupled with the diazo salt of 4-(β-sulfatoethylsulfonyl)aniline. The dyes were characterized by IR spectroscopy and MS. The color fastness test proved that the light-fastness of the dyes could be improved by 1 grade via the introduction of benzene sulfonamide derivatives into the triazine ring when compared with the case of the control dyes. Fluorescence spectra demonstrated that after the introduction of benzene sulfonamide derivatives, the dye molecule could return to the ground state from the excited state and emit fluorescence; in addition, the introduced benzene sulfonamide derivatives helped to deteriorate the adverse effect of UV light on the dye. Moreover, the dyeing results showed that the dyes containing the sulfonamide groups had equal dyeing properties when compared with that of the control dyes.
研究领域:
染料化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Wenjuan Shen,Bingning Wang,Falong Jia,Zhihui Ai,Lizhi Zhang
In general, the final product of atrazine (ATR) degradation by reactive oxygen species is cyanuric acid bearing a stable s -triazine ring, which is not further oxidized under mild conditions. In this study, we demonstrate that the presence of Ni(II) can increase the aerobic ATR degradation rate of core–shell Fe@Fe 2 O 3 nanowires (CSFN) by 6 times and also achieve the cleavage of recalcitrant s -triazine ring. The cleavage of s -triazine ring in this novel system was confirmed by the measurements of formic acid and nitrite acid. On the basis of experimental results, a feasible mechanism was proposed to account for the promoted aerobic ATR degradation and the facile s -triazine ring cleavage as follows. First, Ni(II) adsorbed on the surface of CSFN was reduced to nickel metal, which favored the generation of active hydrogen (•H). The in-situ generated •H then reduced ATR to 4-ethylamino-6-isopropylamino-1,3,5-triazine intermediate of easy ring opening property, rather than the recalcitrant cyanuric acid. Finally, this ATR degradation pathway change promoted the aerobic ATR degradation and benefited the s -triazine ring cleavage. This study clarifies the importance of degradation pathway on the ring-opening of organic pollutants, and also provides a mild method to remove s -triazine herbicides with molecular oxygen and zero-valent iron.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Xiaoyu Zhou,Xingzheng Peng,Xiaoyan Feng,Xuewu Gao,Mengke Li,Haifeng Ji,Guodong Liu,Yi Feng,Xiaojie Zhang
Aqueous zinc ion batteries (AZIBs) are hindered from extensive application due to the sluggish kinetics of hydrated zinc ions and cathodic dissolution, which leads to the deficiency of cycling performance in zinc ion batteries. This work elucidates a series of sulfhydryl-rich binding agents (STN, SON, and SSN). The sulfhydryl groups suspended by the binders interact with the cations in the electrolyte, facilitating the transport of Zn2+, enhancing redox kinetics, and improving the cycling stability of the cell. Additionally, the formation of dynamic S–S bonds after the oxidation of sulfhydryl groups further restricts the volume expansion in the cathode during charge and discharge cycles, ensuring structural stability. The STN binder exhibits the most optimal performance. The N-containing triazine ring interacts with Zn2+, while the sulfhydryl group forms a dynamic coordination bond with Zn2+, thereby enhancing the Zn2+ storage and promoting the Zn2+ intercalation. This dual function ultimately produces a synergistic effect to optimize the electrochemical performance of AZIBs. The initial specific discharge capacity of the cell with the STN binder is 123 mA h g–1 at 1 C multiplicity, which exceeds the 68 mA h g–1 capacity of the cell with the PVDF binder.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR STRUCTURE
·
2011
·
IF 1.599
Xian-Lan Hong,Hong Li,Cui-Hong Peng
A new Ru(II) complex [Ru(dmb) 2 (pdta)](ClO 4 ) 2 ( 1 ) (dmb = 4,4′-dimethyl-2,2′-bipyridine, pdta = 3-(pyridine-2-yl)-as-triazino [5,6-f]-acenaphthylene) was synthesized and characterized by elemental analysis (EA), ES–MS, 1 H NMR, UV–Vis and CV. The DNA-binding properties of complex 1 were investigated by absorption titration, thermal denaturation , viscosity measurement and photoactivated cleavage. The DNA-binding constant was determined to be 2.37 ± 0.14 × 10 5 M −1 ( s = 1.90 ± 0.04) by electronic absorption titration, indicating that complex 1 interacts with DNA through intercalative mode. The redox peak potentials of this complex in CV were rationally assigned with the frontier molecular orbital stereographs resulting from the density functional theory (DFT) calculation. The photoactivated cleavage and cleavage mechanism of plasmid pBR322 DNA in the presence of complex 1 and various inhibitors were studied. The experiment for detecting the formation of singlet oxygen photo-sensitized by complex 1 was carried out, and the antioxidant activity of the Ru-complex and the ligand pdta against hydroxyl radical was also investigated.
研究领域:
无机化学
·
生物化学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-12
·
IF 2.8
Zhang Xinle,Chi Qingguo,Tang Chao,Li Hua,Zhang Changhai,Li Zhonghua,Zhang Tiandong
The rapidly growing third-generation wide-band-gap semiconductor electronic device industry urgently requires high-temperature-resistant packaging materials. However, the epoxy molding compound materials cannot suffer the high-temperature working condition due to the intrinsic molecular chain structure of epoxy materials (EP). In this paper, bisphenol A-type cyanate (BADCy) with triazine ring structure was introduced into EP to improve its heat resistance. The curing reaction as well as the curing mechanism has been clearly revealed for BADCy/EP with different contents of BADCy according to the Fourier transform infrared spectroscopy (FTIR) and differential scanning calorimeter (DSC) results. In the whole copolymer system, the copolymer at higher BADCy concentration (50–60 mol%) achieved the highest crosslink density (12.8 × 10 –3 mol/cm 3 ), thus, showing excellent glass transition temperature (> 200 °C) and thermal decomposition temperature( T 5% > 400 °C). The heat resistance and electrical insulation property of BADCy/EP system have been systematically investigated, and a balance between high heat resistance and good electrical insulation are achieved at 66 mol% BADCy content, where the glass transition temperature reaches 215 °C, which is 73 °C higher than that of the EP system of anhydride copolymer. The volume resistivity of 1.5 × 10 15 Ω·m and dielectric constant of 3.3 is obtained, indicating excellent electrical insulation and dielectric properties of BADCy/EP. This work provides a facile and efficient strategy to improve the overall properties of EP by optimizing the molecular chain structure.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Xin Wang,Li Yang,Yanglin Chen,Chaokun Yang,Jianwen Lan,Jianmin Sun
The silicon-based materials with enriched superficial Si–OH groups are candidates in the field of the cycloaddition of CO2 to epoxide to cyclic carbonate; meanwhile, the triazine ring with a nitrogen-rich structure has shown a high adsorption affinity toward CO2 to polarize CO2. On this basis, a metal-free triazine-incorporated organosilica framework (SiTIOF) containing triazine rings, −NH, and Si–OH was prepared by substitution reaction and then a hydrothermal method. The prepared SiTIOF exhibited an outstanding catalytic activity for the cycloaddition of CO2 to epoxide with the cocatalyst tetrabutylammonium bromide (Bu4NBr) due to the triazine unit and multiple hydrogen bond donors (−NH, −OH). Besides, the SiTIOF catalyst could be reused six times and has good versatility to various epoxides with CO2 cycloaddition. Moreover, the possible reaction mechanism with a hydrogen bond donor (HBD) and halide anion synergistic catalysis was proposed.
研究领域:
材料科学
·
催化化学
·
环境化学
✓ 已验证
DOI
高影响因子
Heliyon
·
2024
·
IF 3.4
Guofang Gao,Junxia Wang,Penghui Liang,Yilei Ruan,Dehua Wang,Li Feng,Xuemei Ma,Zhiyong Hu,Hailin Zhu
In this paper, two triazine ring–containing quaternary ammonium salt Gemini surfactants (C 12 -2-C 12 and C 14 -2-C 14 ) were synthesized. The minimum inhibitory concentrations against sulfate-reducing bacteria (SRB) of C 12 -2-C 12 , C 14 -2-C 14 and dodecyl dimethyl benzyl ammonium chloride (1227) were determined using the double-dilution method. The performance of C 12 -2-C 12 and C 14 -2-C 14 in inhibiting carbon steel corrosion in the presence of SRB was examined, with 1227 serving as a control sample. The corrosion inhibition properties were assessed through static weight loss, electrochemical testing, and surface analysis. The interface adsorption behaviour of the corrosion inhibitor was explored via molecular dynamics simulations. Results indicate that the minimum inhibitory concentrations (MIC) of C 12 -2-C 12 (0.021 mM) and C 14 -2-C 14 (0.005 mM) are lower than that of 1227 (0.300 mM). The results of static weightlessness measurement reveal that the corrosion inhibition effects of the three surfactants on carbon steel soaked in SRB solution follow the order of C 14 -2-C 14 > C 12 -2-C 12 > 1227, with inhibition rates of 93.23 %, 88.45 %, and 76.49 % at a concentration of 0.2 mM, respectively. The adsorption behavior of these surfactants (1227, C 12 -2-C 12 , and C 14 -2-C 14 ) on carbon steel surface in the presence of SRB conforms the Langmuir isotherm adsorption model. The outcomes of electrochemical experiments align with the static weight loss data. Furthermore, surface analysis results suggest that the surfactants can adsorb onto the carbon steel surface to form a protective film, thereby inhibiting SRB-induced corrosion.
研究领域:
材料科学
·
微生物学
·
电化学
✓ 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）