초록 ▼

A method for preparing carbon materials having high surface area and high macropore volume to provide high permeability. These carbon materials are prepared by dissolving a carbonizable polymer precursor, in a solvent. The solution is cooled to form a gel. The solvent is extracted from the gel by em

A method for preparing carbon materials having high surface area and high macropore volume to provide high permeability. These carbon materials are prepared by dissolving a carbonizable polymer precursor, in a solvent. The solution is cooled to form a gel. The solvent is extracted from the gel by employing a non-solvent for the polymer. The non-solvent is removed by critical point drying in CO.sub.2 at an elevated pressure and temperature or evaporation in a vacuum oven. The dried product is heated in an inert atmosphere in a first heating step to a first temperature and maintained there for a time sufficient to substantially cross-link the polymer material. The cross-linked polymer material is then carbonized in an inert atmosphere.

대표청구항 ▼

[ We claim:] [1.] A method for producing a porous carbon material comprising the steps of:a) dissolving poly(vinylidene chloride) in a solvent to form a solution;b) cooling the solution to form a gel;c) extracting the solvent from the gel to form a polymer precursor, said polymer precursor comprisin

[ We claim:] [1.] A method for producing a porous carbon material comprising the steps of:a) dissolving poly(vinylidene chloride) in a solvent to form a solution;b) cooling the solution to form a gel;c) extracting the solvent from the gel to form a polymer precursor, said polymer precursor comprising a macroporous structure;d) cross-linking said polymer precursor to form a cross-linked polymer, said step of cross-linking further comprising the steps of:1) heating the polymer precursor in an inert atmosphere in a first heating step to a first temperature of about 165.degree. C., said first temperature sufficient to initiate a cross-linking reaction in said polymer precursor; and2) maintaining said first temperature for a first period of time, said first period of time at least about 12 hours, said first period of time sufficient to allow said cross-linking reaction to proceed to substantial completion; ande) carbonizing the cross-linked polymer by heating said polymer to a second temperature while maintaining said inert atmosphere, said second temperature being about 750.degree. C., said second temperature being maintained for a second period of time of at least about 30 minutes, said second time period being sufficient to convert substantially all of the cross-linked polymer to carbon, said step of cross-linking preventing destruction of said macroporous structure during said step of carbonization.