摘要:
A method for the production of at least one of oxidized cellulose fibers, oxidized cellulose fiber sheet materials and oxidized cellulose nonwovens includes introducing at least one of cellulose fibers, cellulose fiber sheet materials and cellulose nonwovens into a reactor. A temperature of the reactor is set in a range from 25° C. to 80° C. Gaseous nitrogen dioxide is introduced into the reactor so as to oxidize the at least one of cellulose fibers, cellulose fiber sheet materials and cellulose nonwovens. A temperature of the reactor is set in a range from 20° C. to less than 160° C. The at least one of oxidized cellulose fibers, oxidized cellulose fiber sheet materials and oxidized cellulose nonwovens are neutralized with at least one base.
摘要:
A plurality of fibers or one-dimensional, two-dimensional, or three-dimensional fibrous structures are provided, having fibers from a first raw fiber material. The first raw fiber material contains unsubstituted or partially substituted polyvinyl alcohol and/or unsubstituted or partially substituted polyvinyl alcohol copolymer. The fibers can be crosslinked by tempering the fibers or fibrous structures, with the result that the fibers or the fibrous structure are configured to be gel, in particular hydrogel, fibers or fibrous structures and have excellent stability.
摘要:
A plurality of fibers or one-dimensional, two-dimensional, or three-dimensional fibrous structures are provided, having fibers from a first raw fiber material. The first raw fiber material contains unsubstituted or partially substituted polyvinyl alcohol and/or unsubstituted or partially substituted polyvinyl alcohol copolymer. The fibers can be crosslinked by tempering the fibers or fibrous structures, with the result that the fibers or the fibrous structure are configured to be gel, in particular hydrogel, fibers or fibrous structures and have excellent stability.
摘要:
The present invention provides a method to produce metal-containing nanoparticles enveloped with polymers, as well as particles obtainable therefrom.In the method according to the present invention, at least one anionic polymerizable monomer is polymerized in the presence of an anionic macroinitiator at room temperature. Subsequently, an aliphatic or aromatic sulfide is firstly added, followed by a solution of at least one organosoluble metal salt in an aprotic organic solvent and finally a homogeneous reducing agent. The metal cation is hereby reduced to the metal. Metal-containing nanoparticles are formed which are covalently bonded to the growing anionic polymerizates.The metal salts are preferably salts of silver, copper, gold, tin, lead, chrome or zinc, or mixtures thereof. Anionic polymerizable monomers comprise, by way of example, styrene (St), butadiene, isoprene, ethylene oxide, propylene oxide, caprolactone, lactide, glycolide, acrylates, methacrylates, bisacrylates, cyanoacrylates, amides, siloxanes, vinylpyridines or acrylonitrile.The particles according to the present invention are suitable to be used for the antibacterial finishing of polymers in textiles and materials. Furthermore, they are suitable for the production of inks. If the underlying metals are those metals that show plasmon resonance, the particles are suitable to also be applied in sensors which use the plasmon resonance effect.The metal-containing nanoparticles enveloped with polymers which are accessible using the method according to the present invention do not aggregate or agglomerate, and their physical and chemical properties remain unchanged over a long period of time.