由具有一个或两个SiOH基团的相应单体合成了通过短而柔软的Si-O-Si和SiOH-(OH)Si键松散交联的不溶性但可形成膜的聚(取代乙炔)。这些单体已在均相体系中聚合,以生成均相聚合物在甲苯中的溶液。将所得溶液浇铸在聚四氟乙烯板上,然后蒸发溶剂,得到坚韧而完全不溶的膜。膜表现出良好的氧气和二氧化碳选择性渗透性,其在P O 2与P O 2 / P N 2中的关系图该图超出了1991年Robeson的上限,非常接近2008年Robeson的上限。优异的选择性是由于软网络结构提高了扩散选择性而引起的,该网络结构可以基于短键形成小孔(即超微孔)。渗透率没有下降可能不是由于Si–O–Si和SiOH ---(OH)Si软连接所致。此外在没有改变P Ò 2和P ö 2 / P Ñ 2中观察到的老化。
由具有一个或两个SiOH基团的相应单体合成了通过短而柔软的Si-O-Si和SiOH-(OH)Si键松散交联的不溶性但可形成膜的聚(取代乙炔)。这些单体已在均相体系中聚合,以生成均相聚合物在甲苯中的溶液。将所得溶液浇铸在聚四氟乙烯板上,然后蒸发溶剂,得到坚韧而完全不溶的膜。膜表现出良好的氧气和二氧化碳选择性渗透性,其在P O 2与P O 2 / P N 2中的关系图该图超出了1991年Robeson的上限,非常接近2008年Robeson的上限。优异的选择性是由于软网络结构提高了扩散选择性而引起的,该网络结构可以基于短键形成小孔(即超微孔)。渗透率没有下降可能不是由于Si–O–Si和SiOH ---(OH)Si软连接所致。此外在没有改变P Ò 2和P ö 2 / P Ñ 2中观察到的老化。
Synthesis of Silicon-Containing Unsaturated Polymers by Hydrosilylation Reactions. Photophysical Studies
作者:Fei Wang、Bilal R. Kaafarani、Douglas, C. Neckers
DOI:10.1021/ma034618f
日期:2003.11.1
Silicon-containing unsaturated polymers have been synthesized using the Pt(acac)2-catalyzed photoactivated hydrosilylation of alkynes. These polymers fluoresce at 360 nm when excited at 270 nm due to the π-conjugated vinylphenyl segment in the polymer chain. The polymers have excellent solubility in several organic solvents.
Heme Protein Catalysts for Carbon-Silicon Bond Formation In Vitro and In Vivo
申请人:California Institute of Technology
公开号:US20170218346A1
公开(公告)日:2017-08-03
The present invention provides compositions and methods for catalyzing the formation of carbon-silicon bonds using heme proteins. In certain aspects, the present invention provides heme proteins, including variants and fragments thereof, that are capable of carrying out in vitro and in vivo carbene insertion reactions for the formation of carbon-silicon bonds. In other aspects, the present invention provides methods for producing an organosilicon product, the method comprising providing a silicon-containing reagent, a carbene precursor, and a heme protein; and combining the components under conditions sufficient to produce an organosilicon product. Host cells expressing the heme proteins are also provided by the present invention.
Directed evolution of cytochrome c for carbon–silicon bond formation: Bringing silicon to life
作者:S. B. Jennifer Kan、Russell D. Lewis、Kai Chen、Frances H. Arnold
DOI:10.1126/science.aah6219
日期:2016.11.25
experiments using cytochrome c from Rhodothermus marinus improved the reaction to be 15 times moreefficient than industrial catalysts. Science, this issue p. 1048; see also p. 970 Heme proteins can catalyze the formation of carbon–silicon bonds. Enzymes that catalyze carbon–silicon bondformation are unknown in nature, despite the natural abundance of both elements. Such enzymes would expand the catalytic
Synthesis, in-situ membrane preparation, and good gas permselectivity of insoluble poly(substituted acetylene)s loosely cross-linked with short and soft siloxane and silanol linkages
Insoluble but membrane-formable poly(substitutedacetylene)s loosely cross-linked by short and soft Si–O–Si and SiOH---(OH)Si linkages have been synthesized from the corresponding monomers having one or two SiOH groups. These monomers have been polymerized in homogeneous systems to produce homogeneous polymer solutions in toluene. The resulting solutions were cast on polytetrafuluoroethylene sheets
由具有一个或两个SiOH基团的相应单体合成了通过短而柔软的Si-O-Si和SiOH-(OH)Si键松散交联的不溶性但可形成膜的聚(取代乙炔)。这些单体已在均相体系中聚合,以生成均相聚合物在甲苯中的溶液。将所得溶液浇铸在聚四氟乙烯板上,然后蒸发溶剂,得到坚韧而完全不溶的膜。膜表现出良好的氧气和二氧化碳选择性渗透性,其在P O 2与P O 2 / P N 2中的关系图该图超出了1991年Robeson的上限,非常接近2008年Robeson的上限。优异的选择性是由于软网络结构提高了扩散选择性而引起的,该网络结构可以基于短键形成小孔(即超微孔)。渗透率没有下降可能不是由于Si–O–Si和SiOH ---(OH)Si软连接所致。此外在没有改变P Ò 2和P ö 2 / P Ñ 2中观察到的老化。