Ordered open-cellular carbon microstructure and method of making same

• US 8,585,944 B1
• Filed: 10/10/2007
• Issued: 11/19/2013
• Est. Priority Date: 06/27/2007
• Status: Active Grant

• Current Assignee: HRL Laboratories LLC (The Boeing Co.)
• Original Assignee: HRL Laboratories LLC (The Boeing Co.)
• Inventors: Jacobsen, Alan J.
• Primary Examiner(s): Gupta, Yogendra
• Assistant Examiner(s): HINDENLANG, ALISON L
• Application Number:
  US11/870,379
• Time in Patent Office: 2,232 Days
• Field of Search: 264/29.6
• US Class Current: 264/29.6
• CPC Class Codes: B29C 67/20 for porous or cellular articles, e.g. of foam plastics, coarse-pored chemical aspects of working up macro-molecular substances to porous or cellular articles C08J9/00
• CPC Class Codes: B29D 11/00663 Production of light guides
• CPC Class Codes: C01B 32/00 Carbon; Compounds thereof C01B21/00, C01B23/00 take precedence; percarbonates C01B15/10; carbon black C09C1/48
• CPC Class Codes: G02B 2006/1219 Polymerisation
• CPC Class Codes: G02B 6/12002 Three-dimensional structures
• CPC Class Codes: G02B 6/1221 made from organic materials

Abstract

An ordered open-cellular carbon microstructure and a methods for forming the ordered open-cellular carbon microstructure capable of greatly improving the carbon yield (remaining mass % after carbonization) of an open-cellular polymer material. In one embodiment, the method starts with providing an ordered open-cellular polymer template material. The polymer template material is immersed in a reservoir containing a liquid monomer solution, wherein the liquid monomer solution swells the polymer material. Then the polymer template material is removed from the reservoir containing liquid monomer solution. Excess liquid monomer solution is removed from the polymer template material. The liquid monomer solution absorbed into the polymer template material is polymerized forming a copolymer material by irradiating the template material with ultraviolet (UV) light in a nitrogen environment. The copolymer material is heated in an inert atmosphere, wherein the copolymer material is carbonized resulting in the ordered open-cellular carbon microstructure.

Claims

1. A method for forming an ordered open-cellular carbon microstructure, the method comprising:

providing an ordered open-cellular polymer template material, the polymer template material comprising an interconnected pattern of polymer waveguides;

immersing the polymer template material in a reservoir containing a liquid monomer solution;

swelling the polymer template material with the liquid monomer solution;

removing the polymer template material from the reservoir containing the liquid monomer solution;

removing excess liquid monomer solution from the polymer template material;

polymerizing the liquid monomer solution diffused into the polymer template material to form an ordered open-cellular polymer material; and

heating the ordered open-cellular polymer material in an inert atmosphere to carbonize the ordered open-cellular polymer material to result in the ordered open-cellular carbon microstructure,

wherein the interconnected pattern of polymer waveguides comprises;

a plurality of first truss elements extending along a first direction;

a plurality of second truss elements extending along a second direction; and

a plurality of third truss elements extending along a third direction,

wherein the first, second, and third truss elements interpenetrate each other at a plurality of nodes to form a continuous material.

2. The method as set forth in claim 1, wherein the polymer template material is a polyurethane material.

3. The method as set forth in claim 1, wherein the liquid monomer solution comprises acrylonitrile.

4. The method as set forth in claim 3, wherein the liquid monomer solution comprises a free radical initiator to polymerize the liquid monomer solution.

5. The method as set forth in claim 4, wherein the free radical initiator is utilized to polymerize the liquid monomer solution in response to ultraviolet (UV) light.

6. The method as set forth in claim 5, wherein the polymerizing the liquid monomer solution comprises irradiating the polymer template material with UV light.

7. The method as set forth in claim 6, wherein the polymerizing the liquid monomer solution occurs in a nitrogen environment.

8. The method as set forth in claim 1, wherein the polymerizing the liquid monomer solution comprises polymerizing the liquid monomer solution at a temperature ranging from about 200°

C. to about 400°

C.

9. The method as set forth in claim 1, wherein the polymerizing the liquid monomer solution comprises polymerizing the liquid monomer solution at a temperature ranging from about 200°

C. to about 300°

C.

10. The method as set forth in claim 1, wherein the heating the ordered open-cellular polymer material in the inert atmosphere comprises heating the ordered open-cellular polymer material in the inert atmosphere to a temperature not less than 600°

C.

11. The method as set forth in claim 1, wherein the heating the ordered open-cellular polymer material in the inert atmosphere comprises heating the ordered open-cellular polymer material in the inert atmosphere to a temperature not less than 800°

C.

12. The method as set forth in claim 1, wherein the ordered open-cellular polymer material comprises a separate phase of polyacrylonitrile (PAN).

13. The method as set forth in claim 1, wherein the ordered open-cellular polymer material comprises a copolymer with the ordered open-cellular polymer template material.

14. A method for forming an ordered open-cellular carbon microstructure, the method comprising:

providing an ordered open-cellular polymer template material, the polymer template material comprising an interconnected pattern of polymer waveguides, wherein the polymer template material is a polyurethane material;

immersing the polymer template material in a reservoir containing a liquid monomer solution;

swelling the polymer template material with the liquid monomer solution, wherein the monomer solution comprises a free radical initiator, the free radical initiator being utilized to polymerize the liquid monomer solution in response to ultraviolet (UV) light;

removing the polymer template material from the reservoir containing the liquid monomer solution;

removing excess liquid monomer solution from the polymer template material;

polymerizing the liquid monomer solution diffused into the polymer template material to form an ordered open-cellular polymer material by irradiating the template material with UV light in a nitrogen environment; and

heating the ordered open-cellular polymer material in an inert atmosphere to carbonize the ordered open-cellular polymer material to result in the ordered open-cellular carbon microstructure.

15. The method as set forth in claim 14, wherein the polymerizing the liquid monomer solution comprises polymerizing the liquid monomer solution at a temperature ranging from about 200°

C. to about 300°

C., and wherein the heating the ordered open-cellular polymer material in the inert atmosphere comprises heating the ordered open-cellular polymer material in the inert atmosphere to a temperature not less than 800°

C.

16. The method as set forth in claim 14, wherein the liquid monomer solution comprises acrylonitrile, and wherein the ordered open-cellular polymer material comprises a separate phase of polyacrylonitrile (PAN) or a copolymer with the ordered open-cellular polymer template material.