hydrosilylation of dichloro(methyl)silane with the corresponding 1H,1H,2H-polyfluoro-1-alkene in the presence of hydrogen hexachloroplatinate(IV), followed by the reaction with sodium methoxide. The surfacemodification of glass plate was attempted using these products. From measurements of the contact angles θ(°) of water and oleic acid against a modified glass plate surface, the coupling agents were found
A Convenient Method for the Preparation of Hydrogensiloxanes
作者:Yasushi Yamamoto
DOI:10.1246/bcsj.65.3203
日期:1992.11
Chlorosilanes containing fluorinated organo-substituents are hydrolyzed in a stirred mixture of 1,1,3,3-tetramethyldisiloxane and hydrochloric acid to give the corresponding hydrogensiloxanes substituted with dimethylsiloxy groups in place of chlorine atoms.
Design and synthesis of a fluoro-silane amine monomer for novel thin film composite membranes to dehydrate ethanol via pervaporation
作者:Jian Zuo、Tai-Shung Chung
DOI:10.1039/c3ta11728f
日期:——
A novel hybrid organic–inorganic amine monomer has been designed and synthesized to prepare thin film composite (TFC) membranes for ethanol dehydration via pervaporation. Different from the conventional amine monomer, m-phenylenediamine (MPD), used for interfacial polymerization, the new monomer was molecularly designed to sandwich an inorganic component nonafluorohexylmethyldichloro silane (ClSi) between two MPD molecules. Nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectrometry were used to characterize and verify the chemical structures of the new monomer and the polyamide film. As a result, the advantages of polymeric and inorganic materials are effectively integrated in the newly developed TFC membranes, and these membranes exhibit a superior pervaporation separation performance as compared to most reported membranes in the literature for ethanol dehydration. Their best pervaporation performance shows a flux of 1.9 kg m−2 h−1 and a separation factor of 108 for the dehydration of the 85/15 wt% ethanol–water mixture at 50 °C. These novel TFC membranes show great potential to compete with commercially available membranes.
一种新型有机-无机杂化胺单体已经设计并合成,用于制备薄膜复合(TFC)膜,通过渗透汽化进行乙醇脱水。与用于界面聚合的传统胺单体间苯二胺(MPD)不同,这种新型单体经过分子设计,在两个MPD分子之间夹住一种无机成分九氟己基甲基二氯硅烷(ClSi)。核磁共振(NMR)和傅立叶变换红外(FTIR)光谱法被用于表征和验证新型单体和聚酰胺薄膜的化学结构。结果,聚合物和无机材料的优点被有效地整合到新开发的TFC膜中,与文献中报道的大多数乙醇脱水膜相比,这些膜表现出卓越的渗透汽化分离性能。在50°C下,它们在85/15 wt%乙醇-水混合物的脱水中的最佳渗透汽化性能为1.9 kg m−2 h−1的通量和108的分离因子。这些新型TFC膜显示出与市售膜竞争的潜力。
REDISTRIBUTION OF DICHLOROSILANES AND DIHYDRIDOSILANES. SYNTHESIS OF CHLORO HYDRIDOSILANES
The redistribution of dichlorosilanes RSi(CH3)Cl-2 and dihydridosilanes RSi(CH3)H-2, prepared by reduction of the homologues dichlorosilanes, in the presence of a quaternary ammonium salt is presented. The influence of the nature of R (fluoroalkyl chain R(F)CH(2)CH(2) with R(F)=CF3, C4F9, C8F17, alkyl chain R=C6H13 or aromatic R=C6H5) and of the temperature on the rate of the reaction is studied. The equilibrium constants and free enthalpies are calculated and discussed taking into account the nature of R. The new products described were characterized from I.R, H-1, F-19 and Si-29 NMR spectroscopies.