Elastomeric shape memory polymer composites

Patent metadata

Field	Value
Publication number	US-11866594-B2
Application number	US-201816610215-A
Country	US
Kind code	B2
Filing date	Jun 27, 2018
Priority date	Jun 27, 2017
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

In accordance with one aspect of the presently disclosed inventive concepts, a product includes a porous three-dimensional (3D) printed polymer structure having elastomeric shape memory, where the structure includes a material comprising a plurality of gas-filled microballoons. The 3D printed polymer structure has hierarchical porosity.

First claim

What is claimed is:

1. A product, comprising:
a porous three-dimensional printed polymer structure having elastomeric shape memory, wherein the structure includes a material comprising a plurality of gas-filled microballoons,
wherein the structure has hierarchical porosity.

2. The product as recited in claim 1 , wherein the structure is a face-centered tetragonal printed structure.

3. The product as recited in claim 1 , wherein the gas-filled microballoons have a glass transition temperature in a range of about room temperature to about 200° C.

4. The product as recited in claim 1 , wherein the gas-filled microballoons have a glass transition temperature of less than 60° C.

5. The product as recited in claim 1 , wherein a concentration of gas-filled microballoons in the material is in a range of about 20 vol % to about 50 vol % relative to a total volume of the material.

6. The product as recited in claim 1 , wherein the structure has at least 97% shape memory behavior compared to an original shape of the structure.

7. The product as recited in claim 1 , wherein the structure has at least 80% shape memory behavior compared to an original shape of the structure.

8. The product as recited in claim 1 , wherein the structure following recovery from compression has a structural porosity being at least 80% of the structural porosity before compression.

9. An ink for additive manufacturing, the ink comprising:
a matrix material;
a filler; and
a plurality of gas-filled microballoons, wherein the microballoons are glass transition temperature-specific microballoons configured to cause an elastomeric shape memory of a structure formed with the ink.

10. The ink as recited in claim 9 , wherein a concentration of the plurality of gas-filled microballoons is in a range of about 20 volume % to about 60 volume % of total volume of ink.

11. The ink as recited in claim 9 , wherein the gas-filled microballoons have a glass transition temperature in a range of about room temperature to about 200° C.

12. The ink as recited in claim 9 , wherein the plurality of gas-filled microballoons comprise isobutane.

13. The ink as recited in claim 9 , wherein the plurality of gas-filled microballoons comprise a shell having copolymer material.

14. The ink as recited in claim 9 , wherein the plurality of gas-filled microballoons comprise a shell having polymer material.

15. The ink as recited in claim 9 , wherein the matrix material is selected from the group consisting of: rubbery polymers, siloxane, polysiloxane, polyolefins, polyurethanes, fluorinated olefins, polyethers, polyether copolymers, poly-n-butyl acrylate, poly-ethyl acrylate, poly-n-butyl acrylate copolymer, and poly-ethyl acrylate copolymer.

16. The ink as recited in claim 9 , wherein the filler is a nanosilica filler.

17. A method comprising:
extruding a mixture comprising a matrix material, a filler, and a plurality of gas-filled microballoons through a nozzle for forming a structure having hierarchical porosity; and
curing the mixture in the formed structure to at least a predefined extent wherein the curing includes heating at a temperature for a duration of time.

18. The method as recited in claim 17 , wherein the extruding includes direct ink writing.

19. The method as recited in claim 17 , wherein the formed structure is a face centered tetragonal 3D structure.

20. The method as recited in claim 17 , wherein the curing includes a purge with inert gas at the temperature.

21. The method as recited in claim 17 , wherein the mixture includes a curing agent.

Assignees

• L Livermore Nat Security Llc
• Schulze Stephanie

Inventors

• Wu Amanda
• Bryson Taylor Maxwell
• Duoss Eric
• Metz Thomas R
• Small Ward
• Wilson Thomas S
• Schulze Stephanie
• Cheng Emily

Classifications

• C09D11/102 Primary

  containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds · CPC title

• B29C64/106

  using only liquids or viscous materials, e.g. depositing a continuous bead of viscous material · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B33Y70/10

  Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title