JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 26
·期 9
·6563-6571
·
IF 1.569
Lu Tianxing,You Jing,Zhao Dan,Wang Hua,Miao Yanqin,Liu Xicheng,Xiao Yin,Li Xianggao,Wang Shirong
Three s -triazine/carbazole based bipolar molecules: 9,9′,9″-(1,3,5-triazine-2,4,6-triyl)tris(3,6-di- tert -butyl-carbazole) (TazTCz), 9,9′-(6-phenyl-1,3,5-triazine-2,4-diyl)bis(3,6-di- tert -butyl-carbazole) (PhTazDCz) and 9-(4,6-diphenyl-1,3,5-triazine-2-yl)-3,6-di- tert -butyl-carbazole (DPhTazCz) were synthesized and applied as host materials for blue phosphorescent organic light-emitting diodes (PHOLEDs). The triplet state energy levels are ~2.86 eV for these compounds, ensured their application in blue PHOLEDs. X-ray single crystal structural analysis revealed a non-planar structure of TazTCz, which prevented the intermolecular close-packing in the solid state. X-ray diffraction spectra also confirmed that TazTCz and PhTazDCz could form amorphous films with spin-coating method. The bipolar characteristics of as-synthesized compounds were confirmed by carrier mobility measurement. The device parameters of blue PHOLEDs based on these compounds as host materials exhibit that the balance of electron and hole mobilities is benefit for reducing turn-on voltage and efficiency roll-off at high current density.
研究领域:
材料科学
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有机电子学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2025
·
IF 3.1
Qingqing Yang,Chaosheng Yuan,Yongfu Liang,Xiang Zhu,Zheng Wang,Xuerui Cheng,Lei Su
The high-pressure behaviors of 1,3,5-triazine ( s -triazine) was investigated under static and dynamic compression to elucidate the effects of compression rate on its phase transitions and chemical reactions. Static compression experiments revealed that s -triazine underwent a phase transition from phase I to phase II at 0.69 GPa and initiated chemical reactions above 10.84 GPa. Dynamic compression, however, resulted in a more chemically stable overpressure phase II’, which maintained its structure up to 17.32 GPa. The distinct responses to compression rates suggest that dynamic compression induces metastable structures of s -triazine that consume energy, preventing chemical reactions below the energy threshold. This study highlights the importance of compression rate in determining the chemical and physical properties of s -triazine under high pressure.
研究领域:
高压物理
·
材料科学
·
化学反应动力学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Yuan Zu,Lishuai Zong,Jinyan Wang,Xigao Jian
The development of high-temperature resistant polymers and their composites is of particular interest because of their ever-growing applications. Herein, a family of branched phthalonitrile resins based on different bisphenols (Hydroquinone, 4,4′-Biphenol, m -Dihydroxybenzene, 1,6-Dihydroxynaphthalene, 2,6-Dihydroxynaphthalene) and phenyl- s -triazine, endcapping with 4-nitrophthalonitrile were prepared via a convenient condensation polymerization procedure. The relationship among bisphenol structures, thermal properties and mechanical properties were investigated in details. By incorporating the thermally stable phenyl- s -triazine segment into the branched phthalonitrile's backbone, the overall T g (glass transition temperature) and T d (5% thermal degradation temperature) of the derived polymers were significantly improved. The resins were thermally cured to networks with 4,4′-diaminodiphenyl sulfone (DDS) as curing agent . The resulting networks exhibited high thermal resistance , indicated by T g surpassing 500 °C and T d as high as 575 °C. Additionally, the composites exhibited high mechanical properties and dielectric properties stability at 500 °C. The results suggested the merits of branched phthalonitrile polymers for applications in high-temperature resistant polymers and composites.
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
·
2018
·
IF 6.735
Liwei Chen,Xiaoxin Hu,Ying Yang,Canlan Jiang,Cheng Bian,Chao Liu,Miaoyue Zhang,Tianming Cai
The occurrence of s -triazine herbicides in soils and groundwaters has been reported globally and remediation of these contaminated sites are essentially imperative, especially at accidental spill sites. Present work investigated the feasibility of using Fe 2+ catalyzed persulfate (PS) to effectively degrade s -triazine herbicides (e.g., atrazine (ATZ), terbuthylazine (TEA) and ametryn (AMT)) in soils. The degradation kinetics, mechanisms and soil-types effects were systematically investigated. For arable soil A1, extent of degradation reached 80% for 100 mg kg −1 ATZ contaminated soil after 600 min (PS/Fe 2+ of 16.6 mM/16.6 mM) at 23 °C. Increasing PS and Fe 2+ dosages could enhance ATZ degradation. Acidic condition was favorable for the degradation of ATZ with Fe 2+ /PS process and the contribution of SO 4 − to the overall degradation of ATZ decreased as initial pH increased. The ethyl group and chloride substituent on molecular structure of ATZ affected its degradation comparing to other two s -triazine herbicides. ATZ degradations in two arable soils and one paddy soil indicated that different soils with various physical-chemical properties, such as soil organic matter, available and total Fe contents, may influence the ATZ degradation. Moreover, a total of five degradation products of ATZ were identified in soil A1 by Fe 2+ /PS process. Three degradation pathways including alkyl chain oxidation, dealkylation and dechlorination-hydroxylation reactions with the underlying oxidation mechanisms were tentatively proposed.
研究领域:
环境科学
·
土壤修复
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产品关联
DOI
高影响因子
CLEAN-Soil Air Water
·
2016
·Vol. 44
·期 10
·1315-1322
·
IF 1.716
Tao Chen,Zhangyun Liu,Jinting Yao,Hongyuan Hao,Feng Chen
Fenton-like degradation of three representative s -triazine herbicides, atrazine (Atz), ametryn (Amt), and prometon (Prt), was studied in this work. The effects of initial H 2 O 2 concentration as well as the Fe 3+ concentration on the degradation rate of the herbicides were investigated. The Fenton-like degradation of the s -triazine herbicides fitted well with pseudo first-order kinetics. LCMS-IT-TOF was used to analyze possible degradation intermediates for the three herbicides. Eleven, eleven, and twelve intermediates were identified for Atz, Amt, and Prt, respectively. According to the identified intermediates, the Fenton-like degradation pathways of Atz, Amt, and Prt were proposed, which were suggested to follow two main routes, alkylic oxidation and hydroxylation substitution. The enhanced electron-donating ability of the s -triazine herbicide benefits both degradation reaction routes. Therefore, Amt gives the highest reactivity, while Atz exhibits the highest resistance among three herbicides to the Fenton-like reaction.
研究领域:
环境科学
·
化学
✓ 已验证
DOI
高影响因子
CRYOGENICS
·
2024
·
IF 1.8
Tian Zhao,Yalin Zhao,Zhicong Miao,Tao Wang,Rongjin Huang,Laifeng Li
Epoxy resins are widely used in cryogenic applications due to their distinguished mechanical and electrical insulation properties. To avoid generating enormous amounts of waste that affect the environment and cause economic losses, covalent adaptable networks can be introduced into the epoxy structure to make the thermosetting network reversible. In this study, ester bond and hexahydro-s-triazine structure were adopted in epoxy structures. Two new degradable epoxy resins (HPBE and HPHE) with variances in the content of benzene rings were synthesized which were confirmed by FTIR and NMR. After curing, the thermal, mechanical, thermal conducting properties of the resulting materials were examined. The products exhibited tensile strength and flexural strength all above 120 MPa at 77 K, with glass transition temperature of 89.1 °C and 86.9 °C, respectively. Meanwhile, HPBE and HPHE demonstrated favorable thermal stability, with thermal conductivity comparable to that of the commonly used epoxy resin DGEBA. These resins could be degraded under mild conditions and demonstrated high hydrolysis efficiency (approximately 90 %). This investigation presented a viable method for the application of degradable thermosetting materials in cryogenic environments and the possibility for repairing of high-value equipment. 1
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 7
·3215-3223
·
IF 3.5
Yue-Chen Chen,Yi-Ming Di,Shu-Quan Zhang,Mei-Jin Lin
As an emerging class of hybrid complexes, donor–acceptor (D–A) hybrid heterostructures, which combine the advantages of both organic and inorganic photoactive components, provide excellent platforms for the fabrication of photochromic materials with enhanced photo-responsive performances. Herein, four novel hybrid heterostructures, namely H3TPT·(PW12O40)·2NMP (1), (H1.5TPT)2·(PW12O40) (2), (H3TPT)2·(SiW12O40)·2Cl·2MeCN (3), and H3TPT·(HPMo12O40)·Cl·3NMP (4) (TPT is tri(4-pyridyl)-s-triazine, NMP is N-methylpyrrolidone), have been synthesized and characterized. Benefitting from the strong interactions (anion–π interactions) and matching electron energy levels between the donors and acceptors, some of them exhibited ultrafast photochromic behaviour even up to 1 second. Furthermore, based on experimental and theoretical calculations, the plausible PIET process and structure–activity relationship have been discussed in detail.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
PubMed
高影响因子
ACS Catalysis
·
2020
·
IF 12.35
Zhou Zhang,Wengang Liu,Yuanyuan Zhang,Jingwen Bai,Jian Liu
Herein, taking inspirations from metalloenzymes, we constructed atomically dispersed manganese sites anchored onto conjugated tri-s-triazine units of graphitic carbon nitride as a bioinspired photocatalyst (Mn1/tri-CN) for the oxo-dehydrogenation of N-heterocycles. The primary coordination sphere of atomic Mn-N2 sites (role i: oxygen activation) as well as the π–π stacking interactions between tri-s-triazine units and substrate mimicking the secondary coordination sphere (role ii: substrate adsorption) synergistically realized high-efficiency electron transfer/utilization in photocatalytic oxidation reactions, as was demonstrated experimentally and theoretically. The Mn1/tri-CN catalyst exhibited impressive oxo-dehydrogenation activity and selectivity toward a broad scope of N-heterocycles in an air atmosphere. The current work suggests that simultaneously engineering the metal active sites of catalysts and the adaptive local environment of the matrix may open an avenue for the synthesis of fine chemicals.
研究领域:
催化化学
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Membranes
·
2025
·Vol. 15
·期 8
·231
·
IF 3.6
Zhuangzhuang Tian,Yun Yin,Jiandong Wang,Xiuling Ao,Daijun Liu,Yang Jin,Jun Li,Jianjun Chen
Nanofiltration (NF) is considered a competitive purification method for acidic stream treatments. However, conventional thin-film composite NF membranes degrade under acid exposures, limiting their applications in industrial acid treatment. For example, wet-process phosphoric acid contains impurities of multivalent metal ions, but NF membrane technologies for impurity removal under harsh conditions are still immature. In this work, we develop a novel strategy of acid-resistant nanofiltration membranes based on interfacial polymerization (IP) of polyethyleneimine (PEI) and cyanuric chloride (CC) with the s-triazine ring. The IP process was optimized by orthogonal experiments to obtain positively charged PEI-CC membranes with a molecular weight cut-off (MWCO) of 337 Da. We further applied it to the approximate industrial phosphoric acid purification condition. In the tests using a mixed solution containing 20 wt% P2O5, 2 g/L Fe3+, 2 g/L Al3+, and 2 g/L Mg2+at 0.7 MPa and 25 °C, the NF membrane achieved 56% rejection of Fe, Al, and Mg and over 97% permeation of phosphorus. In addition, the PEI-CC membrane exhibited excellent acid resistance in the 48 h dynamic acid permeation experiment. The simple fabrication procedure of PEI-CC membrane has excellent acid resistance and great potential for industrial applications.
研究领域:
材料科学
·
膜技术
·
环境工程
·
化学工程
·
纳滤
·
耐酸性
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Qiaoyu Zhang,Chengcheng Chen,Fangting Liu,Zhengguo Zhang,Xiaoming Fang
Photocatalytic hydrogen peroxide (H 2 O 2 ) production is a green process but remains a great challenge. Herein, a novel photocatalyst with high activity for H 2 O 2 production, is developed based on 2,5,8-triamino-tri-s-triazine (melem) by linking it with 2, 3-naphthalene dicarboxylic anhydride (NDA). The obtained melem/NDA hybrid not only exhibited narrowed band gap and obviously enhanced visible light absorption, but also showed reduced charge recombination originated from its spatial distribution in HOMO and LUMO induced by the introduction of NDA as verified by DFT calculations. More significantly, the sufficient LUMO and HOMO positions for the optimal sample, melem/NDA 0.5 , ensured efficient H 2 O 2 production from pure water via both the oxygen reduction reactions mainly through the two-step one-electron path and the water oxidation reaction through the one-step two-electron path. Consequently, melem/NDA 0.5 achieves an apparent quantum efficiency of as high as 6.9 % at 420 nm. This work sheds light on developing high-performance organic photocatalysts for boosting photocatalytic H 2 O 2 production.
研究领域:
材料科学
·
化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2023
·
IF 11.1
Dongyu Hao,Xuechuan Wang,Ouyang Yue,Shuang Liang,Zhongxue Bai,Jin Yang,Xinhua Liu,Xugang Dang
Organic chrome-free tanning agents are an important part of the sustainable development in leather manufacturing industry. However, organic chrome-free tanning agents tanned leather have a low isoelectric point (pI < 5), which results in a low absorptivity of traditional anionic wet finishing materials; as a result, leather quality is poor, and tannery wastewater is difficult to treat. In addition, leather is easily eroded by bacteria and mold during its production, storage, and use, causing serious economic loss to enterprises and users. In this study, hexahydro-1,3,5-tris(hydroxyethyl)-s-triazine (HHTT), ethylene glycol glycidyl ether (EGDE), and collagen polypeptide (CP) were used as raw materials to prepare a wrench-like, antimicrobial, amphoteric, epoxy-terminated, organic chrome-free tanning agent (HHTT-EGDE-CP) with a pI of 5.21, and an epoxy value of 0.267 mol/100 g. HHTT-EHDE-CP can establish a stable covalent cross-linking with collagen fibers, thereby enhancing the physicochemical properties of leather, the absorptivity of anionic wet finishing materials, giving leather long-term and efficient antibacterial properties . Experimental results show, that the shrinkage temperature (78.8 °C) and the absorptivity of anionic fatliquors (93.1%) and dyes (97.5%) of HHTT-EGDE-CP-tanned leather surpassed those of leather tanned using commercial organic chrome-free tanning agents. Notably, the inhibition rates of HHTT-EGDE-CP-tanned leather against E. coli and S. aureus reached 99.93% and 99.99%, respectively. In addition, HHTT-EGDE-CP-tanned leather exhibited excellent inhibition against A. flavus and Asp. niger, with long-term and efficient antibacterial properties. This innovative technique offers new perspectives for designing and developing multifunctional green materials toward the sustainable development of industrial manufacturing.
研究领域:
材料科学
·
化学
·
皮革制造
·
可持续发展
✓ 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）