Voxelated liquid crystal elastomers

Patent metadata

Field	Value
Publication number	US-9902906-B2
Application number	US-201615135087-A
Country	US
Kind code	B2
Filing date	Apr 21, 2016
Priority date	Apr 21, 2015
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A shape-programmable liquid crystal elastomer comprises polymerized, nematic monomers. The monomers are organized into a plurality of voxels with each voxel having a director orientation.

First claim

What is claimed is:

1. A shape-programmable liquid crystal elastomer comprising:
cross-linked and polymerized nematic, isotropic monomers organized into a plurality of voxels, each voxel of the plurality having a director orientation such that each voxel of the plurality has a first state according to the director orientation and a second state according to cross-linkages of the polymerized nematic monomers.

2. The shape-programmable liquid crystal elastomer of claim 1 , wherein the nematic monomers are selected from the group consisting of acrylates, methacrylates, thiols, vinyl, epoxides, and amines.

3. The shape-programmable liquid crystal elastomer of claim 1 , wherein the nematic monomers include a ratio mixture of a diacrylate and an amine.

4. The shape-programmable liquid crystal elastomer of claim 3 , wherein the diacrylate is 1,4-bis-[4-(6-acryloxyloxyhexyloxy)benzoyloxy]-2-methylbenzene and the amine is n-butyl amine.

5. The shape-programmable liquid crystal elastomer of claim 1 , wherein the polymer includes a mesogen.

6. The shape-programmable liquid crystal elastomer of claim 1 , further comprising:
a domain comprising adjacent voxels of the plurality having similar director orientation.

7. The shape-programmable liquid crystal elastomer of claim 1 , wherein each voxel of the plurality has a length dimension, a width dimension, and a depth dimension.

8. The shape-programmable liquid crystal elastomer of claim 1 , wherein the polymerized, nematic monomer is polymerized diacrylate functionalized azobenzene.

9. The shape-programmable liquid crystal elastomer of claim 8 , wherein the azobenzene is photopolymerized.

10. A liquid crystal film comprising:
the shape-programmable liquid crystal elastomer of claim 1 ; and
a topographical defect within the cross-linked and polymerized nematic, isotropic monomers of the elastomer, the topographical defect having a first state and a second state,
wherein the topographical defect is configured to assume the first state with a presence of a stimulus and to assume the second state in an absence of the stimulus.

11. The liquid crystal film of claim 10 , wherein the topographical defect is characterized by a strength and a charge.

12. The liquid crystal film of claim 10 , wherein the topographical defect comprises a Gaussian curve.

13. A liquid crystal film comprising:
the shape-programmable liquid crystal elastomer of claim 1 ;
a first domain of the polymerized, nematic monomers having a first average director; and
a second domain of the polymerized, nematic monomers having a second average director,
wherein, in a presence of a first stimulus, the first average director is configured to cause a shape of the first domain to change.

14. The liquid crystal film of claim 13 , wherein, in a presence of a second stimulus, the second average director is configured to cause a shape of the second domain to change.

15. The liquid crystal film of claim 13 , wherein the shape of the first domain reverses in an absence of the first stimulus.

16. The liquid crystal film of claim 13 , wherein, in a presence of a second stimulus, the first average director is configured to cause the shape of the first domain to change again and the second average director is configured to cause a shape of the second domain to change.

17. The liquid crystal film of claim 13 , wherein, in the presence of the first stimulus, the second average director is configured to causes a shape of the second domain to change, the shape change of the second domain being different from the shape change of the first domain.

18. The liquid crystal film of claim 13 , wherein the first domain comprises a first plurality of voxels and the second domain comprises a second plurality of voxels, each voxel of the first and second pluralities having a director orientation.

Assignees

• Us Air Force

Inventors

• White Timothy J
• Ware Taylor H
• Mcconney Michael E
• Wie Jeong Jae
• Ahn Suk Kyun

Classifications

• C09K2219/00

  Aspects relating to the form of the liquid crystal [LC] material, or by the technical area in which LC material are used · CPC title

• C09K2019/0425

  characterized by a specific unit that results in a functional effect · CPC title

• C09K19/3809 Primary

  Polyesters; Polyester derivatives, e.g. polyamides · CPC title

• C08F22/10

  Esters · CPC title

• G02F1/133788

  by light irradiation, e.g. linearly polarised light photo-polymerisation · CPC title