Carbon foam with supplemental material
A carbon foam composite including a carbon foam skeleton having a supplemental material therein, the composite useful for, inter alia, a variety of applications including applications requiring durability and water resistance. Also included is a method for making such carbon foam composite materials.
1. A carbon foam composite article comprising a carbon foam having a pore distribution whereby at least about 90% of the pore volume have a diameter of about 10 to about 150 microns and at least about 1% of the pore volume have a diameter of about 0.8 to about 3.5 microns and a supplemental material comprising a mesophase pitch material within pores of the carbon foam such that the supplemental material only fills pores of the carbon foam within two cell diameters of the surface and the carbon foam composite is externally sealed while maintaining an open interior porosity, wherein the surface energy or fluid affinity of the carbon foam composite article differs from that of the carbon foam.
2. The article of claim 1 wherein the supplemental material further comprises a polymeric foam created from precursors foamed inside the pores.
3. The article of claim 2 wherein the polymeric foam comprises at least one precursor selected from the group consisting of polyvinyl alcohol, polyvinyl chloride, polyvinyl butyral, a polyurethane resin, polystyrene, an acrylic, an epoxy, a phenolic, a polyimide, polymethylene, polystyrene, a polyolefin, polyurethane, and combinations thereof.
4. A process for producing carbon foam having pores with a supplemental material in the pores, comprising providing a parent carbon foam having a pore distribution whereby at least about 90% of the pore volume have a diameter of about 10 to about 150 microns and at least about 1% of the pore volume have a diameter of about 0.8 to about 3.5 microns and introducing a supplemental material comprising a mesophase pitch material in the pores such that the supplemental material only fills pores of the carbon foam within two cell diameters of the surface and the carbon foam composite is externally sealed while maintaining an open interior porosity, wherein the supplemental material/parent carbon foam composite has a different surface energy or fluid affinity than that of the parent carbon foam.
5. The process of claim 4 wherein the carbon foam is a graphite foam.
6. The process of claim 4 wherein the supplemental material further comprises a polymeric foam created from precursors foamed inside the pores.
7. The process of claim 6 wherein the polymeric foam comprises at least one precursor selected from the group consisting of polyvinyl alcohol, polyvinyl chloride, polyvinyl butyral, a polyurethane resin, polystyrene, an acrylic, an epoxy, a phenolic, a polyimide, polymethylene, polystyrene, a polyolefin, polyurethane, and combinations thereof.