In the ESGA characterization of plasma-polymerized fluoropolymer structure, Cu peaks in ESCA spectra are generally assigned to specific functional groups by quantum chemistry calculations based on a charge-potential m...In the ESGA characterization of plasma-polymerized fluoropolymer structure, Cu peaks in ESCA spectra are generally assigned to specific functional groups by quantum chemistry calculations based on a charge-potential modelr. However, such a method is complicated in calculation. Ginnard tried to correlate the electronegativity of given carbon atoms with different substituents on polymer molecules to their C1s, binding energy shifts展开更多
In glow discharge there are two contrary processes for fluorocarbons, i.e. ablation and polymerization. The balance of these two processes has great effects upon the deposition rate, structure and properties of the po...In glow discharge there are two contrary processes for fluorocarbons, i.e. ablation and polymerization. The balance of these two processes has great effects upon the deposition rate, structure and properties of the polymer films to be formed. It is generally believed that in plasma ablation there is a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
文摘In the ESGA characterization of plasma-polymerized fluoropolymer structure, Cu peaks in ESCA spectra are generally assigned to specific functional groups by quantum chemistry calculations based on a charge-potential modelr. However, such a method is complicated in calculation. Ginnard tried to correlate the electronegativity of given carbon atoms with different substituents on polymer molecules to their C1s, binding energy shifts
文摘In glow discharge there are two contrary processes for fluorocarbons, i.e. ablation and polymerization. The balance of these two processes has great effects upon the deposition rate, structure and properties of the polymer films to be formed. It is generally believed that in plasma ablation there is a
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。
