JOURNAL OF SOLUTION CHEMISTRY
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2024
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IF 1.4
Li Dan,Zhang Xuena,Xin Chunling,Liu Meifang
Densities, dynamic viscosities, and refractive indices for four binary mixtures formed by dibutyl ether with ethyl caprylate, ethyl caprate, ethyl laurate or ethyl myristate over the whole composition range were measured at T =(293.15–323.15 K) and atmospheric pressure. The excess molar volume ( V m E ), viscosity deviation (Δ η ), and refractive index deviation (Δ n D ) for the four systems are calculated and then correlated to the Redlich–Kister polynomial. The V m E and Δ η values are all negative over the entire range of mole fractions. The absolute values of V m E for the mixtures increase with increasing temperature and the absolute values of Δ η decrease with increasing temperature. The Δ n D values with the volume fraction for the four binary systems are all positive over the entire composition range. The experimental results can provide reliable data for the compatibility of biodiesels and their blended fuels.
研究领域:
物理化学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2016
·
IF 1.846
Ying Zhang,Xiong Zheng,Maogang He,Yutian Chen
The thermal diffusivity and the speed of sound in dibutyl ether (DBE) were measured using light scattering method, including saturated liquid/vapor and supercritical region. The expanded relative uncertainty ( k = 2) of the thermal diffusivity and the speed of sound was estimated to be less than 2% and 0.5% over the whole investigated range of states. Polynomial representations for the thermal diffusivity and the speed of sound were fitted to the data in saturated liquid/vapor. For the thermal diffusivity, the AAD is 0.50% for the saturated liquid and 0.67% for the saturated vapor . For the speed of sound, the AAD is 0.41% for the saturated liquid and 0.35% for the saturated vapor. The tendency of the thermal diffusivity and the speed of sound to temperature and pressure in supercritical region are also analyzed.
研究领域:
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
PROCEEDINGS OF THE COMBUSTION INSTITUTE
·
2018
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IF 5.336
Zhan Gao,Lei Zhu,Xinyao Zou,Chunpeng Liu,Bo Tian,Zhen Huang
The dibutyl ether (DBE) has been recently identified as an alternative biofuel produced from lignocellulosic biomass . In the present study, experimental and chemical kinetics studies were carried out to investigate the effects of dibutyl ether addition to a biodiesel surrogate (methyl decanoate) on soot formation in laminar coflow diffusion flames . The mole fraction of DBE in the fuel stream varies from 0 to 40 mol%. Laser-induced incandescence (LII) technique was applied to obtain the 2D soot volume fraction distribution and a combined methyl decanoate-dibutyl ether-PAH kinetic model was constructed to analyze chemical effects of DBE addition on the concentration of key species for soot inception and growth. The experimental results show that DBE addition can indeed reduce the soot yielding and the suppressive effect is nonlinear with the mole fraction of DBE in the fuel mixture. It is found that in the flame centerline , soot reduction with more DBE addition is a combined effect of lower nucleation rate and decreasing PAHs condensation, while soot reduction effect is somewhat moderate in flame wings as the result of the competition between decreasing inception rate and enhanced surface growth caused by higher acetylene concentration. Reaction path analysis suggests that DBE addition can markedly suppress C 3 + C 3 pathways to the first aromatic ring , lead to lower A1 yield and consequently limit the aromatic growth to larger PAHs. DBE is found to be remarkably promising in terms of suppressing soot formation and reducing particle emission.
研究领域:
能源科学
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燃烧学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2023
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IF 22.1
Bo Feng,Yaxuan Jing,Xiaohui Liu,Yong Guo,Yanqin Wang
The upcycling of waste polyvinyl chloride (PVC) is a grand challenge because of the unmanageable Cl species. Here, we develop a Cl-transfer strategy to upcycle waste PVC into value-added organic chlorides and PE-like polymer with various Cl acceptors (tetrahydrofuran, dibutyl ether and butanol) over Ru/Al 2 O 3 catalyst. The high utilization efficiency of Cl (> 80 %) can be obtained over Ru/Al 2 O 3 at 180 °C, 2Mpa H 2 with tetrahydrofuran as an acceptor within tens of hours. The excellent performance is attributed to key features including Al 2 O 3 for the C-O bond activation and metal Ru for C-Cl bond activation and H 2 dissociation. The remaining PE-like polymer after removing Cl could be regarded as PE-like feedstock and further converted into methane through the same Ru/Al 2 O 3 catalyst. The Cl-transfer system also enables the upcycling of several common PVC-contained wastes and works well in the scale-up test. This work offers a catalytic path to integrate waste PVC plastic into the supply chain of organic chlorides under the context of circular economy.
研究领域:
化学工程
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材料科学
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环境科学
·
催化
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2016
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IF 1.835
Kai Kang,Xiaopo Wang,Fuxin Yang,John M. Prausnitz
Experimental density data are reported for diethylene glycol monobutyl ether, diethylene glycol dibutyl ether, and ethylene glycol monobutyl ether from (283.15 to 363.15) K at pressures up to 60 MPa using a vibrating-tube densimeter. Relative uncertainties of density measurements are 0.001 with confidence level 0.95. The experimental data were fitted with a Tait-like equation; average relative deviations were 0.017% for diethylene glycol monobutyl ether, 0.015% for diethylene glycol dibutyl ether, and 0.019% for ethylene glycol monobutyl ether. The isobaric thermal expansivity and the isothermal compressibility were derived from the Tait-like equation.
研究领域:
物理化学
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流体性质研究
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高压物性分析
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化工热力学
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Qiang Wang,Zhao-Hui Zhang,Xiao-Tong Jia,Yang-Yu He,Jin-Zhao Zhou,Yuan-Hao Sun,Xing-Wang Cheng
In this study, the pyrolysis products of polycarbosilane were used as sources of carbon and silicon to synthesize (TiZr) 5 Si 3 and TiC reinforcements, enhancing the performance of titanium matrix composites. By controlling the particle scale of the matrix alloy powders, the scale of the reinforcement network structure was successfully manipulated. The microstructural features and mechanical behavior of the (TiC+(TiZr) 5 Si 3 )/TA15 composite were systematically examined. The findings show that the (TiZr) 5 Si 3 and TiC reinforcements create a multi-scale hierarchical network structure within the composite, effectively inhibiting β grains coarsening. The TiC particles have an average size of approximately 3.1 μm, while the (TiZr) 5 Si 3 particles are around 95 nm in size. Relative to pure TA15 alloy, the β grains were refined from 474.7 μm to 40.6 μm. Moreover, the strength of the composite decreased as the network structure size increased, with the maximum yield strength reaching 1423 MPa, a 47.3 % improvement over the TA15 matrix. Meanwhile, the maximum hardness reaches 402.1 HV, corresponding to a 15.8 % increase compared to the TA15 matrix. This improvement primarily results from the refined grains and the uniform dispersion of reinforcements, while the composite’s plasticity remained nearly unaffected by the network structure dimensions.
研究领域:
材料科学
·
力学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2025
·
IF 7.3
Mengtong Wang,Ying Miao,Rikun Liu,Liang Shen,Yingying Du,Changqing Fu
The use of bisphenol A (BPA) in traditional waterborne epoxy coating formulations is harmful to human health, and the low toughness of the cured film severely limits its application in many areas. Most BPA alternatives enhance the toughness of the epoxy cured film but compromise the coating's properties to varying degrees. Therefore, developing a BPA alternative that toughens epoxy resins without sacrificing modulus and mechanical strength remains a significant challenge. In this study, we synthesized dicarboxylic acid compound (PNP) with a structure similar to BPA, using phthalic anhydride and neopentyl glycol. This compound serves as a substitute for BPA. We systematically explored the influence of different PNP contents on the performance of waterborne epoxy resins and coatings. The results showed that PNP is more conducive to preparing waterborne epoxy resins with smaller particle sizes and stable heat storage. Compared with BPA-modified epoxy resin, PNP significantly increases the elongation at break and tensile strength of the cured film. Moreover, different PNP contents can significantly improve the coating's impact resistance, pull-off adhesion, water resistance, salt spray resistance, and acid resistance without affecting other mechanical properties and alkali resistance. This study provides a new perspective for preparing environmentally friendly, high-performance, tough, and stable waterborne epoxy coatings.
研究领域:
材料科学
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高分子化学
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涂层技术
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
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2025
·
IF 2.8
Duan Yuan,Li Jing-Yi,Ding Yong-Bo,Qiao Yong-Luo,Shen Liang,Li Xin-Gui
In this paper, four kinds of bio-based alkyd polyols were prepared from bio-based oleic acid and coconut oleic acid as raw materials. Subsequently, UV-curable waterborne polyurethane acrylate dispersions (UV-WPUAs) were synthesized using the four bio-based alkyd polyols, respectively. Furthermore, these UV-WPUAs were employed to prepare UV-curable waterborne polyurethane acrylate coatings (UV-WPUA coatings). The study focused on comparing the effects of the four bio-based alkyd polyols on the performance of the UV-WPUAs and the resulting UV-WPUA coatings. The results showed that all the UV-WPUAs prepared from the above four bio-based alkyd polyols exhibited semitransparent, low viscosity, small particle size and high zeta potential. Additionally, the UV-WPUA-2 (alkyd polyol was prepared from oleic acid, hexahydrophthalic anhydride, neopentyl glycol and trimethylolpropane) coating exhibited excellent coating properties, such as excellent physical properties, chemical resistance and acceptable yellowing resistance. This phenomenon can be attributed to the higher crosslinking density of the UV-WPUA-2 coating, along with the lack of a benzene ring structure that is typically associated with yellowing. In conclusion, the result of this study confirms that bio-based alkyd polyols are suitable for preparing UV-curable waterborne polyurethane acrylate.
研究领域:
材料科学
·
高分子化学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2025
·
IF 6.3
Zhaoxin Zhong,Jian Ye,Yang Wang,Yuhan Ren,Jiawei Zhang,Biao Zhang,Feng Ye
The pressureless sintering (PLS) technique holds substantial potential in manufacturing cost-effective composites with intricate shapes. Nonetheless, it can lead to reduced density in titanium matrix composites (TMCs), affecting their mechanical properties. This study introduces a novel approach to producing high-density TMCs utilizing polymer encapsulation on hydride-dehydride (HDH) TC4 particles through wet mixing. The coexistence of the sintering Si-B-Ti/Al-C-N liquid phases and a dual approach to deoxidizing HDH TC4 particles synergistically enhance the compactness of the TMCs, achieving densities as high as 98.5 % during PLS. The densification mechanisms for (TiB+TiC+Ti 3 Si)/TC4 composites under different conditions kinetics were revealed by calculating the effective grain growth exponent and activation energy. The (TiB+TiC+Ti 3 Si)/TC4 composite, produced through PLS at 1300 ℃ for 1.5 hours, exhibits exceptional properties with a compressive strength of 2087 MPa and a fracture strain of 41.7 %. This research will provide a feasible avenue for developing high-performance TMCs using the polymer as the reinforcement source and low-cost HDH TC4 powder during PLS.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Tao Guo,Wei Li,Chuanding Dong,Jingdai Wang,Yongrong Yang
The comonomer effect of ethylene/ α -olefin copolymerization in the Ziegler-Natta (Z-N) catalytic system, remaining largely elusive and less understood at the molecular level, has been of huge industrial importance and absorbing research interest for decades. Herein, four catalysts with similar physical structures but different polymerization activities and comonomer effects were synthesized by using n -butanol in combination with different secondary electron donors. By tracking catalyst formation, it was found that altering the secondary donor changes the ν (O-H) stability and in turn the MgCl 2 facet growth, to influence the polymerization activity. In situ diffuse reflectance Ultraviolet–visible spectra show that different types of active Ti centers are in function in the ethylene polymerization and the ethylene/1-butene copolymerization. Tracing further the microscopic structures of active species upon triethylaluminium (TEA) activation by using Extended X-ray Absorption Fine Structure, it is found that: (i) for the catalysts with negative comonomer effect, the enhanced donor migration promotes the aggregation of active species and leads to the formation of TiCl 3 -like clusters; (ii) by contrast, for the catalysts with positive comonomer effect, the less mobile donors hinder the aggregation of active species, thus inducing the formation of isolated Ti 3+ sites. Our work reveals an evident correlation between the active center and the comonomer effect, which may be strongly modified by the aggregation of the former.
研究领域:
化学工程
·
催化
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
TALANTA
·
2021
·
IF 6.057
Zhenyu Lu,Xiaotian Lu,Ling Xia,Yanhui Zhong,Gongke Li,Yufei Hu
In this work, a catalytic material of cobalt doped nitrogenous porous carbon (Co/NPC) was fabricated from covalent organic frameworks (COFs) and cobalt ion via directly carbonization . Attribute to the excellent selective catalytic performance towards n -hexane, Co/NPC was employed in cataluminescence (CTL) for rapid and sensitive determination of n -hexane. Moreover, the detection conditions of CTL were evaluated, including temperature, flow rate and detecting wavelength. Under optimized conditions, a good linear relation between signal intensity of CTL and n -hexane concentration was obtained in the linear range of 0.4–250.0 mg/L and the limit of detection (LOD, S/N = 3) was 0.13 mg/L. Furthermore, the Co/NPC based CTL sensor was successfully applied to the determination of n -hexane in edible oil samples with the recoveries in the range of 92.0%–104.0%. The method comparison results of GC/MS and CTL on real sample analysis further proved the accuracy of the developed Co/NPC based CTL method. Additionally, the possible catalytic mechanism of n -hexane on the surface of Co/NPC was investigated, assisting by GC/MS on intermediation products identification. Overall, the Co/NPC based CTL sensor has been confirmed excellent performance in the n -hexane determination, which revealing extensive application in rapid residual n -hexane analysis in edible oil .
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2019
·
IF 0.931
Ming LI,Jing-Ye CHEN,Yu-Fei HU,Gong-Ke LI
By using nano TiO 2 -Y 2 O 3 as catalyst, cataluminescence (CTL) phenomenon of propylene oxide (PO) was studied, and it was found that the sensor has high sensitivity and good selectivity for the detection of propylene oxide. The common volatile organic compounds (VOCs) such as acetone, acetaldehyde and benzene show no response to the catalysis of TiO 2 -Y 2 O 3 . Based on this phenomenon, a propylene oxide CTL sensor was designed. The ratio of TiO 2 and Y 2 O 3 and the annealed temperatures of the composites were optimized. It was found that when the mass ratio of TiO 2 and Y 2 O 3 was 1:3 and the annealed temperature was 500 °C, the catalytic materials showed the best performance. 0.3 L min −1 of carrier gas flow rate, 490 nm of detection wavelength and 197 °C of working temperature were selected as the optimal working conditions, and under the optimized conditions, the quantitative analysis was performed and CTL intensity was linearly correlated with PO concentration from 4.5 mg L –1 to 1375 mg L –1 with a detection limit (3σ) of 1.25 mg L –1 . The sensor was used for quantitative analysis and real-time monitoring of propylene oxide residues in fumigation cereals. The result was consistent with that analyzed by gas chromatography. The CTL sensor proposed here had many merits such as high sensitivity, rapidity and simple operation and had potential application prospects in the rapid detection of propylene oxide in food. At last, the mechanism of catalytic oxidation of PO was discussed as well.
研究领域:
化学
·
材料科学
·
食品科学
✓ 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）