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The MCM‐41 and SiO2 supported TiCl4 and TiCl4/MgCl2 catalysts with different molar ratios of Mg/Ti were synthesized and used for ethylene polymerization under atmospheric pressure. The nanochannels of MCM‐41 serve as nanoscale polymerization reactor and the polyethylene nanofibers were extruded during the reaction. The nanofibers were observed in SEM micrographs of resulting polyethylene. The effect of MgCl2 on catalytic activity and thermal properties of resulting polyethylene is investigated too. In the presence of MgCl2, the catalytic activity increased and more crystalline polyethylene with higher melting points were formed. However, no fibers could be observed in the polyethylene prepared by SiO2 supported catalysts. 相似文献
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<正>A new practical method for the synthesis of unsymmetrical ureas was achieved by reaction of phenylurea with primary and secondary amines under neutral and mild condition in very good yields.The reaction took place in refluxing dioxane and does not require any catalyst or additives. 相似文献
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Aghili Yegane Seyed Pooya Kasaeian Alibakhsh 《Journal of Thermal Analysis and Calorimetry》2022,147(12):6825-6846
Journal of Thermal Analysis and Calorimetry - The purpose of this study is a presentation of the thermal management of a flat plate solar collector via employing entropy generation analysis. The... 相似文献
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Unsymmetrical ureas and S‐thiocarbamates were prepared in good to excellent yields by direct condensation of phenylurea with amines and thiols in 1‐butyl‐3‐methylimidazolium tetrafluoroborate ([BMIM]BF4) without the addition of any additives. The [BMIM]BF4 ionic liquid is a mild medium and can be recycled and reused several times. 相似文献
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Aghili Yegane Seyed Pooya Kasaeian Alibakhsh 《Journal of Thermal Analysis and Calorimetry》2020,141(5):1969-1980
Journal of Thermal Analysis and Calorimetry - In this work, a numerical study of thermal performance enhancement of a flat plate solar collector has been presented. The collector channel is... 相似文献
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The electrochemical and electro activity properties of poly(aniline‐co‐1‐naphthylamine) thin films have been investigated in the presence of various organic sulfonic acids. Homo and copolymer thin films are synthesized electrochemically, under cyclic voltammetric conditions in aqueous solution of organic sulfonic acids (1 M), viz p‐toluene‐sulfonic acid (P‐TSA), methane‐sulfonic acid (MSA), 5‐sulfosalicylic acid (5‐SSA), camphor‐sulfonic acid (CSA) and dodecylbenzene‐sulfonic acid (DBSA) (0.25 M) on glass carbon (GC) electrode at room temperature. The cyclic voltammograms (CVs) show that the current densities are strongly influenced by the size and acidity of the organic acids which are present in electrolyte. Electocopolymerization was carried out at different ratios of NPA to ANI (0.07, 0.05, 0.03, 0.02, 0.014). The formation of copolymer was proved by cyclic voltammogram study. 相似文献
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Aghili Alireza Sukhorukova Nadezda Ugon Julien 《Journal of mathematical chemistry》2021,59(9):2049-2062
Journal of Mathematical Chemistry - The non-isothermal analysis of materials with the application of the Arrhenius equation involves temperature integration. If the frequency factor in the... 相似文献
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Aghili Siavash Panjepour Masoud Meratian Mahmood 《Journal of Thermal Analysis and Calorimetry》2018,131(3):2443-2455
Journal of Thermal Analysis and Calorimetry - This study investigated the kinetic analysis of the dehydration process of boric acid (H3BO3) and its transformation into boron trioxide (B2O3) under... 相似文献