摘要:
A web-like nanoparticle silicon is produced by laser vaporization of silicon metal in an oxygen-free atmosphere in a diffusion cloud chamber where it aggregates into novel web-like microstructures. The aggregates are porous, and bright yellow to orange photoluminescence from the web-like nanoparticle silicon is observed upon irradiation with ultraviolet light.
摘要:
Nanoparticles of silicon oxide alloys (i.e., oxides of SiMo, SiPt, and SiAl) are produced by laser vaporization of a silicon target and a target of a metal (i.e., Mo, Pt, or Al), in an oxygen containing atmosphere in a diffusion cloud chamber, where the target metal vapors aggregate into novel three-dimensional porous web structures. The structures have a homogeneous composition with a uniform ratio of silicon to the metal.
摘要:
A curable silicone is used to encapsulate porous, photoluminescing silica nanoparticles having three-dimensional, web-like structures. The encapsulation protects the silica nanoparticles, preserves their photoluminescent effect, and can be used as a coating. The composition is used to prepare articles of manufacture by casting it on a substrate such as glass or a silicon wafer and curing it. Special effects can be obtained by using a mask on the substrate prior to deposit of nanoparticles and curing the silicone matrix.
摘要:
A web-like nanoparticle silica is produced by laser vaporization of silicon metal in a helium/oxygen atmosphere in a diffusion cloud chamber where it aggregates into novel web-like microstructures. The aggregates are porous and have a surface area greater than 300 m.sup.2 /g. Bright blue photoluminescence from the web-like nanoparticle silica is observed upon irradiation with ultraviolet light.
摘要:
A process of producing multi-hydroxy polyols, the process comprising providing a biomass material and transamidating the biomass material with an amine selected from the group consisting essentially of a diamine and an alkanolamine, to provide low molecular weight derived amino-acids or derived oligomers of proteins. Thereafter, reacting the derived amino-acids or derived oligomers with a carbonate to provide hydroxyl terminated urethane oligomers.
摘要:
Fuel oxygenates comprised of fatty acid or fatty acid ester derivatives which have been reacted with ozone; a base; and a lower alkanol (1 to 8 carbon atoms) are described. The oxygenates comprise ester groups at a point of cleavage by the ozone which provide oxygen in the oxygenate.
摘要:
Substrates are rendered water repellent by applying to the substrate a hyperbranched polymer containing a silicon atom made by polymerizing a derivatized aminofunctional organosilicon monomer which is the reaction product of an amine functional silane monomer precursor or an amine functional polysiloxane monomer precursor and a derivative of carbonic acid or a cyclic lactone.
摘要:
A method of manufacturing block copolymers containing a polyorganosiloxane segment, by dual polymerization involving (i) polycondensation of a silicone block followed by (ii) the free radical polymerization of a monomer that can be polymerized by free radical polymerization, such as a vinyl containing organic monomer. Initiation of free radical polymerization in step (ii) is carried out with a carbonyl functional group attached to the silicone polymer block. The carbonyl functional silicone polymer, preferably an aldehyde functional silicone polymer, is included as one component of a copper-based Redox initiating system. The method ensures no free homopolymerization, complete reactivity, and various polymer architectures are possible, including for example, polymeric structures such as AB, ABA, (AB).sub.n, brush, and radiant types. The method is fast, effective, convenient, and easier to control than typical ionic polymerization techniques. The silicone-organic block copolymers obtained by the process have utility as polymeric surfactants or as solubility modifiers.
摘要:
A method in which radical polymerization of a vinyl monomer is initiated by an ozonide group attached to a silane or a siloxane polymer. The method is particularly useful for preparing organic polymers having a silicone chain end, or for preparing wide ranges of silicone/organic polymers and copolymers with varied architecture, i.e., ABA block copolymers, comb polymers, star polymers, and hyper-branched polymers. In one embodiment, the method is carried out by simply heating a vinyl monomer in the presence of a silane containing ozonide functionality. The ozonide silane is obtained by exposing silanes or siloxanes having an alkyl group containing a double bond to ozone. Surprisingly, an ozonide attached to an organosilicon compound was found to be stable, and capable of initiating vinyl polymerization upon heating to moderate temperatures, i.e., about 70.degree. C.
摘要:
This invention relates to hollow elongate articles such as tubing and fibers formed from non-crosslinked polyvinyl alcohol. The articles are prepared by extruding a solution of polyvinyl alcohol in the shape of the desired article into a coagulating bath concurrently with a stream of a non-solvent for the polymer. The stream occupies the area corresponding to the interior cavity of the article and prevents collapse of the cavity until the article has solidified in the coagulation bath.