Abstract:
High internal phase emulsions (HIPEs) and polyHIPEs formed therefrom. HIPE components have been adjusted to delay and/or prevent polymerization and free radical decomposition at certain temperatures. Methods include preparing two water-in-oil emulsions; one emulsion includes an oxidizing initiator at a concentration not sufficient to induce polymerization, and another emulsion includes a reducing agent. The two emulsions may be stored for months. When combined, a redox reaction is induced, resulting in polymerization (polyHIPE formation) at temperatures below 100°C, such as between 20°C and 40°C. This allows a final composition to be formed in situ, with or without highly sensitive materials, including biologically-derived or active constituents (e.g., cells, growth factors, enzymes, proteins, drugs, chemoactive agents). The polymerization rate may be short, as fast as thirty seconds. HIPE components as well as the redox reaction may be controlled to manipulate time to cure, pore size, distribution of pores, and/or internal contents.
Abstract:
A method for producing a porous carbon material and a porous carbon material produced thereafter are described. The method comprises the formation of an unsatured polymer having a porous structure by polymerization of at least on carbonaceous monomer in a monomer phase of a monomer-water emulsion, the transformation of the unsaturated polymer by chemical and/or physical treatment and the carbonization of the transformed polymer by thermal treatment.
Abstract:
The present invention relates to a High Internal Phase Emulsion (HIPE) and HIPE foams produced therefrom comprising two or more layers and having a photoinitiator.
Abstract:
L'invention se rapporte à de nouvelles mousses obtenues par polymérisation en émulsion à phase interne hautement concentrée, qui sont formées d'un polymère réticulé exclusivement hydrocarboné, à base de monomères styréniques, et qui présentent une densité au moins égale à 6 mg/cm3 et au plus égale à 20 mg/cm3 ainsi que des cellules d'un diamètre moyen au plus égal à 20 microns. Elle se rapporte également au procédé de fabrication de ces mousses.
Abstract:
The present invention comprises compositions and methods of making high internal phase emulsion foam (HIPE) and inverse high internal phase emulsion foam (I-HIPE) using super critical fluids. Such foams may be used in a wide variety of articles such as absorbent articles.
Abstract:
According to the present invention, there is provided a porous polymer material and a method of production thereof, where a large majority, for example 80 % or more, or even up to about 100 % of the material is in the form of substantially spherical beads with narrow bead size distributions. These polymeric beads have a porous structure, characterized by cavities joined by interconnecting pores (a HIPE structure), some of which are connected to the surface of the bead.
Abstract:
The invention relates to foam composites having improved properties. These polymeric foams are prepared by polymerization of certain water-in-oil emulsions having a relatively high ratio of water phase to oil phase, commonly known in the art as high internal phase emulsions, or "HIPEs." The HIPE-derived foam materials used in the present invention comprise a generally hydrophobic, flexible, semi-flexible, or rigid nonionic polymeric foam structure of interconnected open-cells. These foam structures have a density of less than about 100 mg/cc, a glass transition temperature (Tg) of between about -40 DEG and 90 DEG C, and at least about 1 % by weight compatible fibers incorporated into the foam. The foam composites have improved tensile properties compared to foams having no incorporated fibers or foams having noncompatible fibers incorporated therein.