A star-shaped compound of perfluoro-1-octanesulfonated fullerene was synthesized. The measurement of the friction for its spin-coating film by friction force microscopy (FFM) reveals that the films possess lower frict...A star-shaped compound of perfluoro-1-octanesulfonated fullerene was synthesized. The measurement of the friction for its spin-coating film by friction force microscopy (FFM) reveals that the films possess lower friction force compared to that of the star-shaped C-60-polystyrene films.展开更多
The purpose of the investigation is the study of the physico-chemical properties and electro-catalytic characteristics of the Nafion and MF-4SK membranes with the author’s nanoparticles (A. Revina, 2008) incorporated...The purpose of the investigation is the study of the physico-chemical properties and electro-catalytic characteristics of the Nafion and MF-4SK membranes with the author’s nanoparticles (A. Revina, 2008) incorporated into the perfluoro- sulphonated cationic membranes. An important advance in the creation of new nano-composite materials with poly-functional activity is the inclusion of nanoparticles of various metals (Pd, Pt, Ag) in these membranes. Polymer ion exchange membranes represent widely applicable materials in various areas of modern nanotechnologies. The obtained nanocomposites on the base of included nanoparticles have the perspective properties and polyfunctional activity for the applications.展开更多
A new fluorinated polystyrene bearing a p substituted perfluoro[1 (2 fluorosulfonylethoxy)]ethyl group was synthesized via one electron oxidation of polystyrene by perfluoro[2 (2 fluorosulfonyl ethoxy)]prop...A new fluorinated polystyrene bearing a p substituted perfluoro[1 (2 fluorosulfonylethoxy)]ethyl group was synthesized via one electron oxidation of polystyrene by perfluoro[2 (2 fluorosulfonyl ethoxy)]propionyl peroxide at different peroxide to polystyrene molar ratios. The yield of perfluoroalkylation decreases with the increase of the reactant molar ratio. The modified polymer has been characterized by various techniques: the ring pefluoro[1 (2 fluorosulfonylethoxy)]ethylation has been proved by FT IR and 19 F NMR; the X ray photoelectron spectra (XPS) show the maximum binding energy of F 1s , O 1s , C 1s (two kinds of carbon atoms, namely C H and C F) and S 2p , respectively; desulfonylation of the fluorinated polystyrene appearing at 217 ℃ has been found by its thermogravimetric analysis (TGA). The determinations of contact angle, refractive index and glass transition temperature of the modified polymer have disclosed that when the contact angle increases with the increase of the molar ratio, the refractive index and glass transition temperature decrease. The polydispersity values indicate that the degradation of the polymer chains did not occur during the reaction.展开更多
For the reaction of Wanzlick’s dimer （I） with compounds containing 'active hydrogen' H—Y, we have proposed the following mechanism （see also [3,4b]）: In order to demonstrate the generality of this mechan...For the reaction of Wanzlick’s dimer （I） with compounds containing 'active hydrogen' H—Y, we have proposed the following mechanism （see also [3,4b]）: In order to demonstrate the generality of this mechanism, the reactions of the perhalo carboxylic acids CCl3COOH, CF3COOH, n-C3F7COOH, and dimer （I） were studied. On the other hand, if Wanzlick’s claim that the dimer （I） could spontaneously dissociate into the nucleophilic carbenes （II） is true, then the latter should easily react with the electrophilic perfluoro-olefins. Therefore, the reaction of perfluoropropene with the dimer （I） was also investigated. Trichloroacetic acid was found to展开更多
氟醚油基磁性液体转轴密封的启动力矩随静置时间发生改变,限制了在特殊密封领域的应用。通过粘性阻力矩的推导理论分析了影响启动力矩的因素,搭建实验台研究了启动力矩随静置时间的变化规律,并使用Anton Paar MCR302流变仪对磁性液体的...氟醚油基磁性液体转轴密封的启动力矩随静置时间发生改变,限制了在特殊密封领域的应用。通过粘性阻力矩的推导理论分析了影响启动力矩的因素,搭建实验台研究了启动力矩随静置时间的变化规律,并使用Anton Paar MCR302流变仪对磁性液体的流变性能进行测量来验证粘度变化的影响作用,最后从摩擦学角度分析了长时间静置后启动力矩的变化趋势。结果表明:启动力矩随静置时间逐渐增大并最终趋于稳定,旋转刚停止时刻的启动力矩远小于静置后的最大平均启动力矩。磁性液体粘度是影响启动力矩发生变化的关键因素,剪切稀化和团聚现象是引起变化的本质原因,接触面的静摩擦作用是导致长时间静置后启动力矩仍会有微小增大的原因。展开更多
基金This project is financially supported by the National Natural Science Foundation of China (No. 50173001)
文摘A star-shaped compound of perfluoro-1-octanesulfonated fullerene was synthesized. The measurement of the friction for its spin-coating film by friction force microscopy (FFM) reveals that the films possess lower friction force compared to that of the star-shaped C-60-polystyrene films.
文摘The purpose of the investigation is the study of the physico-chemical properties and electro-catalytic characteristics of the Nafion and MF-4SK membranes with the author’s nanoparticles (A. Revina, 2008) incorporated into the perfluoro- sulphonated cationic membranes. An important advance in the creation of new nano-composite materials with poly-functional activity is the inclusion of nanoparticles of various metals (Pd, Pt, Ag) in these membranes. Polymer ion exchange membranes represent widely applicable materials in various areas of modern nanotechnologies. The obtained nanocomposites on the base of included nanoparticles have the perspective properties and polyfunctional activity for the applications.
文摘A new fluorinated polystyrene bearing a p substituted perfluoro[1 (2 fluorosulfonylethoxy)]ethyl group was synthesized via one electron oxidation of polystyrene by perfluoro[2 (2 fluorosulfonyl ethoxy)]propionyl peroxide at different peroxide to polystyrene molar ratios. The yield of perfluoroalkylation decreases with the increase of the reactant molar ratio. The modified polymer has been characterized by various techniques: the ring pefluoro[1 (2 fluorosulfonylethoxy)]ethylation has been proved by FT IR and 19 F NMR; the X ray photoelectron spectra (XPS) show the maximum binding energy of F 1s , O 1s , C 1s (two kinds of carbon atoms, namely C H and C F) and S 2p , respectively; desulfonylation of the fluorinated polystyrene appearing at 217 ℃ has been found by its thermogravimetric analysis (TGA). The determinations of contact angle, refractive index and glass transition temperature of the modified polymer have disclosed that when the contact angle increases with the increase of the molar ratio, the refractive index and glass transition temperature decrease. The polydispersity values indicate that the degradation of the polymer chains did not occur during the reaction.
文摘For the reaction of Wanzlick’s dimer （I） with compounds containing 'active hydrogen' H—Y, we have proposed the following mechanism （see also [3,4b]）: In order to demonstrate the generality of this mechanism, the reactions of the perhalo carboxylic acids CCl3COOH, CF3COOH, n-C3F7COOH, and dimer （I） were studied. On the other hand, if Wanzlick’s claim that the dimer （I） could spontaneously dissociate into the nucleophilic carbenes （II） is true, then the latter should easily react with the electrophilic perfluoro-olefins. Therefore, the reaction of perfluoropropene with the dimer （I） was also investigated. Trichloroacetic acid was found to
文摘氟醚油基磁性液体转轴密封的启动力矩随静置时间发生改变,限制了在特殊密封领域的应用。通过粘性阻力矩的推导理论分析了影响启动力矩的因素,搭建实验台研究了启动力矩随静置时间的变化规律,并使用Anton Paar MCR302流变仪对磁性液体的流变性能进行测量来验证粘度变化的影响作用,最后从摩擦学角度分析了长时间静置后启动力矩的变化趋势。结果表明:启动力矩随静置时间逐渐增大并最终趋于稳定,旋转刚停止时刻的启动力矩远小于静置后的最大平均启动力矩。磁性液体粘度是影响启动力矩发生变化的关键因素,剪切稀化和团聚现象是引起变化的本质原因,接触面的静摩擦作用是导致长时间静置后启动力矩仍会有微小增大的原因。
