Conformable reversible adhesives with shape memory assisted delamination

Patent metadata

Field	Value
Publication number	US-10081746-B2
Application number	US-201615388336-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Dec 22, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A shape memory elastomeric composite that has temperature-controlled, shape memory, and reversible adhesive properties, and is soft enough to confirm to an irregular surface. The composite is formed from a synthesized polyhedral oligomeric silsesquioxane-containing thermoplastic polyurethane elastomer and poly(ε-caprolactone) by electrospinning the two components separately and simultaneously and then hot compacting the electrospun composition to form a dense film.

First claim

What is claimed is:

1. A reversible adhesive, comprising:
a composite mat having a first set of fibers and a second set of fibers that are dispersed and intertwined together;
wherein the first set of fibers comprises poly(ε-caprolactone) fibers; and
wherein the second set of fibers comprises polyhedral oligomeric silsesquioxane-containing thermoplastic polyurethane elastomer fibers.

2. The adhesive of claim 1 , wherein the poly(ε-caprolactone) fibers have a melting point of around 56 degrees Celsius.

3. The adhesive of claim 2 , wherein the polyhedral oligomeric silsesquioxane-containing thermoplastic polyurethane elastomer fibers have a glass transition temperature of around minus 54 degrees Celsius, a first melting point of around degrees Celsius, and a second melting point of around 116 degrees Celsius.

4. The adhesive of claim 3 , wherein the poly(ε-caprolactone) fibers comprise between two and 38 weight percent of the composite mat.

5. The adhesive of claim 4 , wherein the composite mat is characterized by at least one thousand percent strain prior to failure.

6. The adhesive of claim 5 , wherein the composite mat has a Young's modulus from 6 to 30 MPa.

7. A method of providing a reversible adhesive, comprising:
providing a composite mat having a first set of fibers and a second set of fibers that are dispersed and intertwined together, wherein the first set of fibers comprises poly(ε-caprolactone) fibers and the second set of fibers comprises polyhedral oligomeric silsesquioxane-containing thermoplastic polyurethane elastomer fibers;
heating the composite mat above a melting temperature of the poly(ε-caprolactone) fibers; and
contacting the heated composite mat to a substrate.

8. The method of claim 7 , further comprising the step of simultaneously electrospinning the first set of fibers with the second set of fibers to form the composite mat of dispersed and intertwined fibers.

9. The method of claim 8 , wherein the poly(ε-caprolactone) fibers have a melting point of around 56 degrees Celsius.

10. The method of claim 9 , wherein the polyhedral oligomeric silsesquioxane-containing thermoplastic polyurethane elastomer fibers have a glass transition temperature of around minus 54 degrees Celsius, a first melting point of around degrees Celsius, and a second melting point of around 116 degrees Celsius.

11. The method of claim 10 , wherein the poly(ε-caprolactone) fibers comprise between two and 38 weight percent of the composite mat.

12. The method of claim 11 , wherein the composite mat is characterized by at least one thousand percent strain prior to failure.

13. The method of claim 12 , wherein the composite mat has a Young's modulus from 6 to 30 MPa.

Assignees

• Mather Patrick T
• Robertson Jaimee Marie
• Univ Syracuse

Inventors

• Mather Patrick T
• Robertson Jaimee Marie

Classifications

• C09J175/04 Primary

  Polyurethanes · CPC title

• C09J183/10

  Block or graft copolymers containing polysiloxane sequences (obtained by polymerising a compound having a carbon-to-carbon double bond on to a polysiloxane C09J151/08, C09J153/00) · CPC title

• C09J167/04 Primary

  Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C09J167/06 takes precedence) · CPC title

• C09J183/16

  in which all the silicon atoms are connected by linkages other than oxygen atoms · CPC title

• C08G77/458

  containing polyurethane sequences · CPC title