POLYMER DEGRADATION AND STABILITY
·
2013
·
IF 2.77
Xiaopeng Xu,Si Chen,Wei Tang,Yingjun Qu,Xu Wang
Basic zinc cyanurate (Zn 3 (C 3 N 3 O 3 ) 2 ·ZnO, represented as Zn 3 Cy 2 ) was synthesized via a precipitation method, and investigated as a thermal stabilizer for poly(vinyl chloride) (PVC) by thermogravimetric analysis (TGA), Congo red test and discoloration test. The thermal stability of PVC was significantly enhanced with the addition of Zn 3 Cy 2 . Compared with zinc stearate (ZnSt 2 ), it is observed a significant improvement that Zn 3 Cy 2 could delay the “zinc burning” of PVC. This is attributed to the strong ability of the cyanurate anions in Zn 3 Cy 2 to absorb the hydrogen chloride released by the degradation of PVC. Moreover, mixing Zn 3 Cy 2 with calcium stearate (CaSt 2 ) in different mass ratios greatly promoted the thermal stability of PVC. Excellent synergistic effects could be observed when CaSt 2 /Zn 3 Cy 2 combined with some commercial auxiliary stabilizers. Addition of dibenzoylmethane (DBM) brought a remarkable increase in initial color for PVC containing CaSt 2 /Zn 3 Cy 2 while epoxidized soybean oil (ESBO) could improve both initial color and long-term stability.
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
Toxics
·
2023
·Vol. 11
·期 9
·799
·
IF 4.6
Hangwei Wang,Zhanren Liu,Shaojie Liu,Ruoru Yang,Yifei Wang,Yiying Gu,Min Wu,Ruihua Dong,Bo Chen
This study aimed to assess the therapeutic efficacy of catechin against experimentally induced kidney stones resulting from co-exposure to melamine (MEL) and cyanuric acid (CYA) in male Sprague–Dawley rats. To induce nephrolithiasis, a combination of MEL and CYA (1:1 ratio, each at a dose of 31.5 mg/kg bw/day) was administered to the rats for 28 consecutive days. After nephrolithiasis was successfully induced, the rats were randomly divided into two groups: a treatment group and a sham group. The treatment group was given a daily oral dose of 50 mg/kg of catechin for 28 days, while the sham group received no intervention. Urine and blood samples were collected throughout the treatment period, and kidney samples were taken on day 28. Our findings demonstrated that treatment with catechin significantly reduced crystal deposition and pathological damage in the rats from nephrolithiasis. Additionally, renal injury markers were significantly decreased in the treatment group compared to the sham group. These findings suggest that catechin has potential therapeutic benefits in treating nephrolithiasis induced by co-exposure to MEL and CYA.Keywords:melamine;cyanuric acid;nephrolithiasis;catechin
研究领域:
毒理学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
THERMOCHIMICA ACTA
·
2020
·
IF 2.762
Yanhui Yao,Yazhou Wen,Chunyu Yang,Jing Zhang,Qinghui Ren,Xiaohua Shi
In order to choose the suitable solvent for the synthesis of cyanuric acid from urea through the liquid phase pyrolysis method, the solubilities of urea and cyanuric acid in eight kinds of pure solvents, N,N -dimethyl formamide, cyclohexanol, N,N -dimethyl acetamide, 1,2-propanediol, N -methylpyrrolidone, 2-methyl-1,3-propanediol, formamide and tetramethylene sulfone, were determined in the temperature ranging from 300.75 K to 369.45 K using the laser assisted-dynamic method under atmospheric pressure. The modified Apelblat model, van’t Hoff model and λh model were employed to correlate the solubilities of urea and cyanuric acid respectively, in which the Apelblat equation was better with the relative average deviation 0.18∼1.95 %. In addition, the thermodynamic properties of the dissolution processes were calculated and discussed based on the Apelblat equation, indicating that the dissolution process is an endothermic non-spontaneous entropy-driven process. Finally, formamide, 1,2-propanediol and 2-methyl-1,3-propanediol were selected as solvent for the synthesis of cyanuric acid from urea.
研究领域:
化学工程
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2023
·Vol. 95
·期 10
·1618-1626
·
IF 0.9
Ren Qinghui,Qian Linfeng,Yao Yanhui,Wen Yazhou,Shi Xiaohua
Abstract Cyanuric acid is an organic intermediate widely used in organic synthesis, and the traditional production method of cyanuric acid is the pyrolysis urea method. Due to the shortcomings of uneven mass transfer, many by-products and poor environmental friendliness, the production of cyanuric acid is extremely limited. In this paper, an effective method has been developed to synthesize cyanuric acid with high yield in a short period of time through the addition-elimination reaction of dihydric alcohol and urea under alkaline conditions. The reaction time, molar ratio of reactants, reaction temperature and other influencing factors were studied. Under optimized conditions, the yield of cyanuric acid is over 90%. And further the proposed reaction mechanism is verified. The synthetic method provided in this article has the advantages of easy availability of raw materials and reusability, simple operation and short reaction time, which makes the method novel and environmentally friendly.
研究领域:
有机化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NATURE
·
2023
·Vol. 622
·期 7983
·493-498
·
IF 64.8
Han Dongyuan,Wang Jie,Agosta Lorenzo,Zang Ziang,Zhao Bin,Kong Lingmei,Lu Haizhou,Mosquera-Lois Irea,Carnevali Virginia,Dong Jianchao,Zhou Jianheng,Ji Huiyu,Pfeifer Lukas,Zakeeruddin Shaik M.,Yang Yingguo,Wu Bo,Rothlisberger Ursula,Yang Xuyong,Grätzel Michael,Wang Ning
Lead halide perovskite light-emitting diodes (PeLEDs) have demonstrated remarkable optoelectronic performance 1 , 2 , 3 . However, there are potential toxicity issues with lead 4 , 5 and removing lead from the best-performing PeLEDs—without compromising their high external quantum efficiencies—remains a challenge. Here we report a tautomeric-mixture-coordination-induced electron localization strategy to stabilize the lead-free tin perovskite TEA 2 SnI 4 (TEAI is 2-thiopheneethylammonium iodide) by incorporating cyanuric acid. We demonstrate that a crucial function of the coordination is to amplify the electronic effects, even for those Sn atoms that aren’t strongly bonded with cyanuric acid owing to the formation of hydrogen-bonded tautomeric dimer and trimer superstructures on the perovskite surface. This electron localization weakens adverse effects from Anderson localization and improves ordering in the crystal structure of TEA 2 SnI 4 . These factors result in a two-orders-of-magnitude reduction in the non-radiative recombination capture coefficient and an approximately twofold enhancement in the exciton binding energy. Our lead-free PeLED has an external quantum efficiency of up to 20.29%, representing a performance comparable to that of state-of-the-art lead-containing PeLEDs 6 , 7 , 8 , 9 , 10 , 11 , 12 . We anticipate that these findings will provide insights into the stabilization of Sn(II) perovskites and further the development of lead-free perovskite applications.
研究领域:
材料科学
·
光电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2023
·
IF 4.6
Yan Chen,Chunli Hu,Zhi Fang,Jianggao Mao
The first metal carboxylate-cyanurates, namely, K(H3C3N3O3)(HCO2) (I) and Ba2(H2C3N3O3)(CH3CO2)3(H2O) (II), which contain π-conjugated carboxylate and cyanurate groups, have been synthesized by hydrothermal methods. They crystallize in centrosymmetric space groups of P1̅ and P21/n, respectively. Compound I exhibits a novel three-dimensional (3D) structure based on a [K(H3C3N3O3)]+ cationic framework with 12-membered ring (12-MR) channels, and the (HCO2)− anions are located within the 12-MR channels. The [K(H3C3N3O3)]+ cationic framework is composed of K+ ions interconnected by H3C3N3O3 ligands. Compound II features a 3D network formed by [Ba2(CH3CO2)3]+ cationic double chains bridged by (H2C3N3O3)− anions. The [Ba2(CH3CO2)3]+ cationic double chain is composed of (CH3CO2)− anions and Ba2+ ions. Optical property measurements show that both compounds exhibit short ultraviolet cutoff edges (I, 208 nm; II, 218 nm) and wide band gaps (I, 5.43 eV; II, 5.20 eV). Importantly, K(H3C3N3O3)(HCO2) (I) features a large birefringence of 0.285@532 nm due to the parallel alignment of π-conjugated H3C3N3O3 and (HCO2)− groups, indicating that K(H3C3N3O3)(HCO2) (I) is a promising short-wave ultraviolet birefringent material. Detailed theoretical calculations elucidate that their excellent optical properties originate from the synergetic effect of both types of π-conjugated groups.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Peifan Qin,Deqi Yi,Jianwei Hao
To investigate thermal shock properties of melamine cyanurate (MCA) for molybdenum disulfide (MoS 2 ) exfoliation, the MoS 2 -MCA superlattice is prepared through self-assembly of pristine MoS 2 , cyanuric acid (CA) and melamine (MA) in water solution. The prepared MoS 2 -MCA is heated in tubular furnace with controlled temperature to obtain two-dimensional (2D)-MoS 2 precursor. Their morphologies are characterized by using Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The obtained 2D-MoS 2 precursor shows a high specific surface area at 336.90 m 2 /g due to bi-layer MoS 2 . TEM and atomic force microscope (AFM) images of 2D-MoS 2 N-methyl-2-pyrrolidone (NMP) solution further confirm the bi-layer MoS 2 exfoliation. The above results prove that MCA is a good thermal shock agent for MoS 2 exfoliation. And the prepared 2D-MoS 2 precursor could also be a good solid reservoir.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Jinhui Huang,Wenjian Cheng,Yahui Shi,Guangming Zeng,Hanbo Yu,Yanling Gu,Lixiu Shi,Kaixin Yi
A metal-free modified carbon nitride MCU(DMSO)-C 3 N 4 (3:3:1) with a honeycomb-like morphology was prepared via firstly introducing cyanuric acid and urea into melamine in dimethyl sulfoxide (DMSO) as the precursor for the MCU-C 3 N 4 . A variety of characterization methods, including XRD, XPS, FT-IR, SEM, TEM , UV–vis, photoluminescence (PL), and photocurrent generation, were applied to investigate the structure, morphology, optical, and photoelectrochemical properties of the g-C 3 N 4 and MCU-C 3 N 4 (3:3:1). Rhodamine B (RhB), methylene blue (MB), and bisphenol A (BPA) were selected as target pollutants to evaluate photocatalytic activity of the MCU-C 3 N 4 (3:3:1) under visible light irradiation. MCU-C 3 N 4 (3:3:1) exhibits significantly enhanced photocatalytic activity compared with g-C 3 N 4 , where 99.49% RhB is removed within 40min, 97.7% MB is removed within 80 min, and 84.37% BPA is removed within 90 min. The improved photodegradation efficiency was mainly due to the larger surface area, the stronger REDOX ability, and the increased separation efficiency of photogenerated electron-hole pairs. The active radical trapping experiments and electron spin resonance tests indicated that h + and O 2 − radicals were the dominant active species whereas OH radicals could be a minor factor. A possible photocatalytic mechanism is proposed. This strategy here provides an ideal platform for the design of photocatalysts with large surface area and high porosity for various pollutant controlling applications.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Yiya Wei,Yang Yang,Baiyang Chen,Bingcheng Yang
Chlorinated cyanurates (CCAs) are a type of disinfectants currently used worldwide for fight of Coronavirus. However, CCAs upon dosed into water can release not only free chlorine (FC), a strong disinfectant, but also cyanurate (CYA), a persistent compound potentially harmful to human and environment. Therefore, detecting CYA and FC in water are very important not only for ensuring sufficient disinfection but also for monitoring the impacts of FC and CYA on receiving watershed. However, conventional analytical methods for them are mostly based on colorimetric methods, which have high method detection limits (MDLs) and rely on chemical reactions that are likely sensitive to coexisting chemicals. To overcome these issues, we herein proposed a facile and reaction-free method to detect CYA and FC together in just one run by ion chromatography (IC) equipped with both conductivity and ultraviolet absorbance detectors. The method features obvious advantages over colorimetric methods in being lower MDLs (3.6 μg/L for CYA and 9.0 μg/L for FC), environmental-friendly (i.e., no organic solvent involved), and more resistant to alkaline solution. With this method, trace levels of CYA (i.e., 34–44 μg/L), which were nondetectable by conventional method, were found in two river water samples, implying that the local environment was already polluted by CCAs during the pandemic period. Overall, this study demonstrates a robust tool that may assist better understanding and monitoring the fate and transport of trace CCA derivatives in water.
研究领域:
环境科学
·
分析化学
·
公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xinhe Wu,Guoqiang Chen,Jiayue Kang,Zixuan Zheng,Guohong Wang,Wei Zhong,Huogen Yu
The previously reported studies on cyanuric acid-assembly strategy usually ignores the promoting function of cyanuric acid in the production of g-C 3 N 4 , limiting the development of molecular assembly strategies. In this study, a cyanuric acid-controlled synthesis strategy involving the pre-assembly of cyanuric acid with melamine and subsequent one-step calcination was developed to produce a three-dimensional (3D) nanoflower-like graphitic carbon nitride (g-C 3 N 4 ) aerogel . Some cyanuric acid molecules underwent a polycondensation reaction with melamine during the pre-assembly process and finally polymerized into the g-C 3 N 4 structure during subsequent calcination. Meanwhile, the remaining cyanuric acid molecules assembled with melamine via hydrogen-bond interactions and underwent incomplete decomposition during subsequent calcination, which not only promoted the production of 3D nanoflower-like aerogel structures, but also introduced the carbonyl (C O) and hydroxyl (–OH) groups onto the g-C 3 N 4 surface, resulting in the successful generation of a 3D nanoflower-like oxygen-modified g-C 3 N 4 aerogel. Moreover, the fabricated g-C 3 N 4 aerogel exhibited a greatly enhanced H 2 production rate (1573 μmol h −1 g −1 ), which is ∼ 6.6 times higher than that of bulk g-C 3 N 4 (239 μmol h −1 g −1 ) owing to the synergistic promotion function of ultrathin nanoflower-like aerogel and oxygen modification structures. This strategy provides a theoretical basis for the development of highly efficient g-C 3 N 4 photocatalysts via molecular assembly.
研究领域:
材料科学
·
化学工程
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Renewable Materials
·
2018
·Vol. 6
·期 6
·584-590
·
IF 0.986
Chen Zijian,Hou Rui,Cheng Jianbing,Fang Fengjie,Tang Donglin,Zhang Guangzhao
Biobased urea nowadays attracts increasing attention as a biomass resource with giant potential, which benefits from the development of biobased ammonia and ecological sanitation system. Urea is an ideal feedstock for chemical industry and developing new urea-based polymer materials
can take advantage of the urea resource. In this work, a class of renewable linear polyesters, namely polyisocyanuratoesters (PICEs) were synthesized from a urea-based monomer bis(2-carbomethoxyethyl) isocyanurate and biobased aliphatic diols. Compared with conventional aliphatic polyesters,
PICEs containing isocyanurate rings in the polymer chain backbone exhibit outstanding flame retardancy that both PICE-4 (the number '4' refers to the number of methylene in diols, e.g. 4 for butylene and 6 for hexylene) and PICE-6 have high limiting oxygen index values over 30%. In the UL
94 tests, PICE-6 reaches V-1 rating; while V-2 is found for PICE-10. All PICEs exhibit similar pyrolysis behavior that the temperatures of 5% weight loss are around 320°C. PICEs are found to have glass transition among 20°C-45°C. No crystallization behavior is observed without
annealing except for PICE-10, which can crystallize even at room temperature.
研究领域:
材料科学
·
化学工程
·
生物质利用
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2025
·
IF 3.6
Jianxi Xie,Lianghua Zhou,Weihao Ye,Yan Zhang,Guangqi Hu,Xiaotang Liu
Carbon dots (CDs) with aggregation-induced emission (AIE) effect can effectively solve the problem of weak fluorescence of solid CDs due to aggregation-caused quenching (ACQ) effect. A kind of carbon dots@cyanuric acid composites (CDs@CYA) with AIE effect was reported in this paper, which is prepared by one-step microwave-assisted method using low-toxicity and low-cost imidazole, urea and tartaric acid as precursors. The AIE effect of CDs@CYA is derived from the restriction of intramolecular motion of the imidazole and cyanuric acid (CYA) groups on the surface of CDs in the aggregation state and convert non-radiative energy into radiative energy, as is verified by control variable experiments. CDs@CYA aqueous solution was used in fluorescent anti-counterfeiting ink, light conversion film (LCF), fluorescent probe and biological imaging. CDs@CYA powder was encapsulated on the blue chip with red phosphor by epoxy resin to obtain a white light-emitting diode (LED) device with a color coordinate of (0.33, 0.28), a color temperature of 5558 K and a color rendering index of 76.4.
研究领域:
材料科学
·
光学
·
生物成像
✓ 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）