Self-healing polymeric composition

Patent metadata

Field	Value
Publication number	US-10570307-B2
Application number	US-201415036941-A
Country	US
Kind code	B2
Filing date	Nov 18, 2014
Priority date	Nov 18, 2013
Publication date	Feb 25, 2020
Grant date	Feb 25, 2020

Abstract

A self-healing polymeric composition includes a polymer matrix and a plurality of functional microcapsules dispersed in the polymer matrix. The functional microcapsules include a core of a flowable material that can form film via coalescence, physical crosslinking and/or polymerization on contact with the substrate, and a polymer shell encapsulating the core. The functionality on the polymer shell is effective in complexing with the corrosion by-products, releasing the core material to repair the failure.

First claim

The invention claimed is:

1. A self-healing polymeric composition comprising:
a polymer matrix and a plurality of microcapsules dispersed in the polymer matrix;
the microcapsules including a core of a flowable polymerizable material that can polymerize on contact with a substrate that is capable of generating iron (II) or Al (III) ions under stressed or corrosive environment, and a polymer shell encapsulating the core;
wherein a complexation agent is attached to the polymer shell and the complexation agent forms a complex with a corrosion byproduct creating stress on the polymer shell to rupture the polymer shell, or wherein a corrosion sensing functional group is attached to the polymer shell and the polymer shell ruptures on sensing corrosion byproducts.

2. The self-healing polymeric composition of claim 1 wherein a corrosion sensing functional group is attached to the polymer shell.

3. The self-healing polymeric composition of claim 2 wherein the corrosion sensing functional group is effective to provide a visual, optical or spectral indication upon contact with a corrosion by-product.

4. The self-healing polymeric composition of claim 1 wherein a complexing agent is attached to the polymer shell.

5. The self-healing polymeric composition of claim 4 wherein the complexing agent is effective to form a complex with a corrosion byproduct, the complexation creating a stress on the polymer shell that promotes the rupturing.

6. The self-healing polymeric composition of claim 4 wherein the complexing agent is selected from the group consisting of quinolines, morpholines, imidazoles, oxazoles and thiazoles.

7. The self-healing polymeric composition of claim 1 wherein the polymer shell is cross-linked to increase its brittleness and susceptibility to rupture.

8. The self-healing polymeric composition of claim 1 wherein the polymer matrix comprises a paint and an unencapsulated activator or catalyst.

9. The self-healing polymeric composition of claim 1 wherein the flowable polymerizable material has a viscosity below or equal to 500 cps.

10. The self-healing polymeric composition of claim 1 wherein the polymerizable material is thermoplastic.

11. The self-healing polymeric composition of claim 10 wherein the polymerizable material comprises thermoplastic oligomers.

12. The self-healing polymeric composition of claim 11
wherein the thermoplastic oligomers have solubility parameter below or equal to 25 Mpa 1/2 , number average molecular weight between 250 and 7000, and viscosity below or equal to 500 cps.

13. The self-healing polymeric composition of claim 11 wherein the thermoplastic oligomers have one or more hydroxyl, amine, carboxyl, vinyl and acrylic functionality.

14. The self-healing polymer composition of claim 11 wherein the polymerizable material further comprises a peroxygen compound.

15. The self-healing polymeric composition of claim 14 wherein the peroxygen compound is present in the amount between 0.1-1.0 wt % and the peroxygen compound is ammonium peroxydisulfate, potassium peroxydisulfate, or peroxy diphosphate.

16. A self-healing polymeric composition comprising:
a polymer matrix and a plurality of microcapsules dispersed in the polymer matrix;
the microcapsules including a core of a flowable polymerizable material that can polymerize on contact with a substrate that is capable of generating reducing agents under stressed or corrosive environment, and a polymer shell encapsulating the core, wherein the polymerizable material comprises thermoplastic oligomers having a solubility parameter below or equal to 25 Mpa 1/2 , number average molecular weight between 250 and 7000, and viscosity below or equal to 500 cps;
the polymer shell effective for rupturing with a failure of the polymer matrix to allow flow of the polymerizable material to repair the failure.

17. The self-healing polymeric composition of claim 16 wherein a corrosion sensing functional group is attached to the polymer shell or wherein a complexing agent is attached to the polymer shell.

18. The self-healing polymeric composition of claim 16 wherein the thermoplastic oligomers have one or more hydroxyl, amine, carboxyl, vinyl and acrylic functionality.

19. The self-healing polymer composition of claim 16 wherein the polymerizable material further comprises a peroxygen compound selected from ammonium peroxydisulfate, potassium peroxydisulfate, and peroxy diphosphate.

Assignees

• Battelle Memorial Institute

Inventors

• Lalgudi Ramanathan S
• Muszynski Britt Beth

Classifications

• C09D175/02

  Polyureas · CPC title

• C09D161/24

  with urea or thiourea · CPC title

• C09D133/06 Primary

  of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical · CPC title

• C09D161/06

  of aldehydes with phenols · CPC title

• B29C73/163

  Sealing compositions or agents, e.g. combined with propellant agents · CPC title