Abstract:
Composite material comprising a) a porous matrix material comprising a siloxane polymer, comprising a closed porosity volume fraction and, optionally, an open porosity volume fraction, and b) a conductive or semiconductive filler substantially present in said closed porosity volume fraction of said porous matrix material a), films, coated substrates and multilayer systems comprising the composite material and the use thereof in pressure sensing devices.
Abstract:
A method of making a porous material is provided. The method includes: preparing a mixture including a sugar, a polymer, and at least one soluble metal source, in water; heating the mixture to obtain a gelled material; thermally curing the gelled material to obtain a cured material; and annealing at least a part of the cured material to obtain a porous material that includes metal nanoparticles, where the metal nanoparticles include at least one metal from the at least one soluble metal source. The porous material can include: sheets of multilayer graphene layers; metal nanoparticles dispersed among the sheets and encapsulated by layers of graphene; and macropores, mesopores or micropores, or any combination thereof, throughout the porous material and on its surface. Methods of using the porous material to separate contaminants from water are also provided.
Abstract:
The present disclosure is directed to a closed cell foam matrix for delivering oxygen containing a superabsorbent material oxygen entrapped within the superabsorbent material. The superabsorbent material has at least 15 percent by mass monoethylenically unsaturated carboxylic, sulphonic or phosphoric acid or salts thereof, an acrylate or methacrylate ester that contains an alkoxysilane functionality, and. a copolymerizable hydrophilic glycol containing ester monomer. To produce the closed cell foam matrix for delivering oxygen, an alkali hydroxide catalyst is added to the superabsorbent material to form a hydrogel layer. Then, an oxygen precursor is added to the hydrogel layer. The hydrogel layer is heated to produce oxygen by reacting the alkali hydroxide catalyst and the oxygen precursor thereby entrapping the oxygen in the formed closed cell foam matrix.
Abstract:
L'invention concerne une composition carbonée gélifiée formant un gel monolithique polymérique organique apte à former par pyrolyse un monolithe de carbone poreux, son utilisation, et un procédé de préparation de cette composition. Une composition selon l'invention est à base d'une résine issue au moins en partie de polyhydroxybenzène(s) R et de formaldéhyde(s) F, présente une conductivité thermique inférieure ou égale à 40 mW.m -1 .K -1 , et elle comprend au moins un polyélectrolyte cationique hydrosoluble P. Un procédé de préparation de cette composition comprend : a) une polymérisation dans un solvant aqueux des polyhydroxybenzène(s) et formaldéhyde(s), en présence dudit au moins un polyélectrolyte cationique dissous dans ce solvant et d'un catalyseur, pour l'obtention d'une solution à base de la résine, b) une gélification de la solution pour l'obtention d'un gel, et c) un séchage pour l'obtention du gel monolithique polymérique organique.
Abstract:
Method for preparing a chitosan-based porous layer The present invention relates to a method or preparing a chitosan-based, neutralized compressed porous layer, comprising the following steps: - a) a chitosan solution is prepared, - b) said solution is poured into a mould in order to form a layer, - c) the layer obtained in b) is lyophilized so as to obtain a porous layer, - d) said porous layer obtained in c) is compressed, - e) the compressed porous layer obtained in d) is neutralized by means of an NH 4 OH solution. It also relates to an implant comprising a layer obtained according to such a method.
Abstract:
Polyolefin dispersions, froths, and foams and articles manufactured therefrom are disclosed. Also disclosed is a method for generating a thermoplastic foam from an aqueous dispersion. The aqueous dispersion may include a thermoplastic resin, water, and a stabilizing agent. The method may include adding at least one frothing surfactant to the aqueous dispersion to form a mixture, adding a flame retardant and/or a phase change material, frothing the mixture to create a froth, and removing at least a portion of the water to produce the foam.
Abstract:
A method for producing foams, such as sponges, from hydrocolloids is described. A solid or semi-solid gel is formed by dissolving polymeric material in an aqueous solvent. The gel formed is allowed to set, and may optionally then be cut into the desired shape. The gel may be frozen to allow formation of ice crystals to act as porogens. Subsequently, the gel is exposed to a radiant energy field for drying under vacuum. This causes the solvent to boil and the foam or sponge is formed. Medicinally active ingredients may be included in the process, so that the sponge or foam formed contains the active ingredient dispersed within the structure. The method described provides an alternative to the conventional methods of particulate leaching or freeze drying.
Abstract:
Verfahren zur Herstellung von Polymerschäumen aus Polykondensations-Reaktivharzen mit maximal 1 µm Porendurchmesser umfassend: 1) Herstellen einer gelierbaren Mischung des Polykondensations-Reaktivharzes in einem Lösungs- oder Dispersionsmittel, 2) Herstellen einer wässrigen Dispersion enthaltend Polymerpartikel, 3) Vermischen der Mischung aus Schritt 1) mit der Dispersion aus Schritt 2), wobei ein wasserhaltiges Gel entsteht, und 4) Trocknen des wasserhaltigen Gels, wobei der Polymerschaum entsteht, wobei in Schritt 4) bei einem Druck und einer Temperatur getrocknet wird, die unter dem kritischen Druck und unter der kritischen Temperatur der flüssigen Phase des Gels liegen, und wobei nach Schritt 3) und vor Schritt 4) das Gel nicht mit einer organischen Flüssigkeit in Kontakt gebracht wird, um das im Gel enthaltene Wasser gegen diese Flüssigkeit auszutauschen.
Abstract:
Stable high internal phase water-in-oil emulsions containing polymerizable vinyl monomers, crosslinking monomers and polymerization initiators are obtained by using saccharide fatty acid esters as surfactants. The amount of surfactants necessary fo form stable high internal phase water-in-oil emulsions is decreased by using saccharide fatty acid esters as surfactants. Further, hydrophobic foams can be obtained by using saccharide fatty acid esters.