Abstract:
A process and apparatus for producing a nanovoided article, a nanovoided coating, and a low refractive index coating is described. The process includes providing a first solution of a polymerizable material in a solvent; at least partially polymerizing the polymerizable material to form a composition that includes an insoluble polymer matrix and a second solution, wherein the insoluble polymer matrix includes a plurality of nanovoids that are filled with the second solution; and removing a major portion of the solvent from the second solution. An apparatus for the process is also described, and includes a webline, a coating section, a partial polymerization section, and a solvent removal section.
Abstract:
Porous organic polymeric films having multiple discrete cavities can be prepared using an water-in-oil emulsion that includes a cavity stabilizing hydrocolloid on the inner walls of the multiple discrete cavities. The multiple discrete cavities can also include organic catalytic materials for various catalytic reactions, markers materials for security applications, or the multiple discrete cavities can be used to increase opacity, hydrophobicity, or other desirable properties compared to nonporous organic polymeric films composed of the composition and dry thickness.
Abstract:
Disclosed is a process for production of a colored polyimide molded article including the steps of molding a polyamic acid solution composition containing a polyamic acid solution obtained from at least a tetracarboxylic acid component and a diamine component and a coloring precursor, or a polyimide solution composition containing a polyimide solution and a coloring precursor; and then thermally treating a molded product at 250° C. or higher.
Abstract:
A method of manufacturing porous polymer particles with improved filterability is described. One or more first water phases are formed comprising an anionic hydrocolloid with a mass-per-charge value of less than 600 and a relatively minor amount, compared to the anionic hydrocolloid, of at least one of a nonionic, cationic, zwitterionic, or weakly anionic water soluble or dispersible polymer, where the weakly anionic water soluble or dispersible polymer has a mass-per-charge value of larger than 600. A water-in-oil emulsion is formed by dispersing the one or more first water phases into an organic phase comprising at least one of either (i) preformed polymer dissolved in an organic solvent or (ii) polymerizable monomers, and homogenizing. A water-in-oil-in-water multiple emulsion is formed by dispersing the water-in-oil emulsion into a second water phase containing a stabilizing agent and homogenizing. The organic solvent is removed to precipitate the preformed polymer, or the polymerizable monomers are polymerized, to obtain a dispersion of porous polymer particles in an external aqueous phase, wherein individual porous particles each comprise a continuous polymer phase and internal pores containing an internal aqueous phase. The dispersion of porous polymer particles is filtered to remove the external aqueous phase. The method enables increased filtration rates of porous polymer particle dispersions containing water in the pores.
Abstract:
The present invention relates to a process for producing porous materials, which comprises reaction of at least one polyfunctional isocyanate with an amine component comprising at least one polyfunctional substituted aromatic amine and also water in the presence of a solvent.The invention further relates to the porous materials which can be obtained in this way and the use of the porous materials as insulation material and in vacuum insulation panels,
Abstract:
The invention relates to a porous polymeric monolith based on a polymerised high internal phase emulsion (polyHIPE) which is hypercrosslinked, and to the preparation and use thereof, preferably as gas storage material.
Abstract:
The present invention relates to cross-linked polyolefin aerogels in simple and fiber-reinforced composite form. Of particular interest are polybutadiene aerogels. Especially aerogels derived from polybutadienes functionalized with anhydrides, amines, hydroxyls, thiols, epoxies, isocyanates or combinations thereof.
Abstract:
The present invention is core-shell polymer particles comprising a common binder polymer for the core and the shell wherein the core has a porosity and the shell is non-porous The particles have a porosity from 10 to 70 percent.
Abstract:
The present invention is a method for the preparation of porous particles that includes dissolving a polymer material in a first organic solvent and adding a second organic solvent and nonionic organic polymer particles to form an organic phase. The organic phase is dispersed in an aqueous phase that includes a particulate stabilizer to form a dispersion and the dispersion is homogenized. The first and second organic solvents are evaporated and the product is recovered.
Abstract:
Synthetic methods for the preparation of hydrophobic organics aerogels. One method involves the sol-gel polymerization of 1,3-dimethoxybenzene or 1,3,5-trimethoxybenzene with formaldehyde in non-aqueous solvents. Using a procedure analogous to the preparation of resorcinol-formaldehyde (RF) aerogels, this approach generates wet gels that can be dried using either supercritical solvent extraction to generate the new organic aerogels or air dried to produce an xerogel. Other methods involve the sol-gel polymerization of 1,3,5 trihydroxy benzene (phloroglucinol) or 1,3 dihydroxy benzene (resorcinol) and various aldehydes in non-aqueous solvents. These methods use a procedure analogous to the one-step base and two-step base/acid catalyzed polycondensation of phloroglucinol and formaldehyde, but the base catalyst used is triethylamine. These methods can be applied to a variety of other sol-gel precursors and solvent systems. These hydrophobic organics aerogels have numerous application potentials in the field of material absorbers and water-proof insulation.