摘要:
Disclosed is a method for generating macroporous polymeric crosslinked materials and the materials obtained therewith. The method uses beads of reversible hydrogels or selected core-shell beads as pore forming materials which are introduced as solid beads into a liquid of polymerisable monomers, for example via a drop-on-demand technique. After the polymerisation of the monomers the solid beads are liquefied and the pore-forming material is removed from the polymer matrix. This technique allows formation of macropores with uniform diameter and with a high amount of macropores being in fluid communication with each other. The macroporous polymeric crosslinked materials, preferably in the form of hydrogels, can be used as substrates in tissue-engineering.
摘要:
Porous infusible polymer (IP) parts are made by incorporating 0.2 to 10 volume percent organic fibers, preferably with short lengths, into the particulate IP, consolidating the mixture under pressure and optionally heating, and then 'burning' off' the fibers. After the fibers are burned off the resulting part has porosity in which the pores are elongated, usually retaining the shape of the organic fibers. When these parts are exposed to moisture (which they usually absorb) and then suddenly heated they tend not to blister from vaporization of the water. This makes them useful as parts for aircraft (jet) and other engines and other applications where sudden temperature increase may occur.
摘要:
A biodegradable material with nanopores and the fabricating method thereof includes steps of providing a polysaccharide polymer; implanting multiple biodegradable nanoparticles on the polysaccharide polymer; and digesting those biodegradable nanoparticles through multiple enzymes to provide multiple nanopores on the polysaccharide polymer; the polysaccharide polymer being further implanted with a group of nano-grade electrically conductive material; and the biodegradable material with nanopores simultaneously providing advantages of biocompatibility, biodegradability, elasticity, retarded elasticity, porosity, and conductivity.
摘要:
The present invention discloses a foam sheet and its production process comprising the formation of a plurality of independent cells and/or a plurality of continuous cells. The foam sheet is produced from a foamable composition that contains an acid generator that generates an acid or a base generator that generates a base due to the action of an active energy beam and a compound that has a decomposing foamable functional group that decomposes and eliminates one or more types of low boiling point volatile substances by reacting with the acid or base.
摘要:
Object: to provide a porous polyimide whose dielectric constant and refractive index are lowered while maintaining intrinsic performances of a polyimide, such as heat resistance, etc., and which is highly transparent. Means for solving: a porous polyimide comprising a polyimide containing matrix, and a plurality of micropores dispersed in said matrix, characterized in that said micropores are formed by removing a hydrophilic polymer from a precursor comprising a polyimide-containing matrix, and the hydrophilic polymer dispersed in said matrix, and that the porous polyimide has light transmittance of no less than 70 %.
摘要:
A porous article having excellent heat resistance, a finely cellular structure, and a low dielectric constant; and a process for producing the porous article which comprises subjecting a polymer composition having a micro-domain structure comprising a continuous polymer phase and dispersed therein a discontinuous phase having an average diameter smaller than 10 µm to a treatment for removing the ingredient constituting the discontinuous phase by at least one operation selected from vaporization and decomposition and by an extraction operation to thereby make the polymer porous. The ingredient constituting the discontinuous phase has a weight average molecular weight of, e.g., 10,000 or lower. Liquefied carbon dioxide, supercritical carbon dioxide, or the like can be used as an extraction solvent for the ingredient constituting the discontinuous phase.
摘要:
Die Erfindung betrifft eine Formmasse auf Basis von Fluorpolymeren, die zusätzlich 1 bis 50 Gew.-% mindestens eines Sulfoxidgruppen enthaltenden Polymers enthält. Das Sulfoxidgruppen enthaltende Polymer enthält insbesondere Polyarylensulfoxid Einheiten der Formel:
摘要:
The invention relates to a process for preparing a microporous membrane from an unsulfonated poly(phenylene sulfide) polymer by forming a mixture of an unsulfonated poly(phenylene sulfide) polymer, an amorphous polymer, and optionally a plasticizer, heating the resulting mixture, extruding or optionally casting the mixture into a membrane, controlled cooling (quenching) or coagulating the membrane, and leaching the membrane, while optionally drawing the membrane before, during, and/or after leaching.