Particulate-based reactive nanocomposites and methods of making and using the same

Patent metadata

Field	Value
Publication number	US-9102576-B1
Application number	US-201313795800-A
Country	US
Kind code	B1
Filing date	Mar 12, 2013
Priority date	May 31, 2012
Publication date	Aug 11, 2015
Grant date	Aug 11, 2015

Abstract

Reactive nanocomposites, foams, and structures comprising functionalized metal nanoparticles that are incorporated into a fluorinated polymer matrix using an in-situ polymerization process and methods of making and using the same. The reactive nanocomposites, foams, and structures according to the present invention demonstrate enhanced mechanical properties due to the direct chemical integration of the nano-metal fuel particles into the fluoropolymer matrix. In addition, the reactive nanocomposites, foams, and structures may be processed using conventional polymer processing and may be used to fabricate materials such as reactive liners, casings, and other components and inserts. The intense heat produced during reaction may further be used in a variety of applications such as disinfection, decontamination, and/or destruction.

First claim

What is claimed is:

1. A method of making a reactive nanocomposite, the method comprising:
dissolving a ligand in a solvent;
adding the ligand solution to a mixture comprising a plurality of first reactive metal nanoparticles and a free radical scavenger;
stirring the mixture with the ligand solution at a first elevated temperature to produce functionalized reactive metal nanoparticles having the ligand coupled to an exterior surface of first reactive metal nanoparticles of the plurality; and
mixing the functionalized reactive metal nanoparticles with a free-radical initiator, a fluorinated monomer, and additional solvent at a second elevated temperature, such that the ligand interacts with the fluorinated monomer, thereby incorporating the functionalized metal nanoparticles into a fluorinated polymer matrix by in-situ polymerization.

2. The method of claim 1 , wherein the first reactive metal nanoparticles of the plurality comprising at least one selected from the group consisting of of Al, B, Mg, Si, Zr, Hf, Fe, and Ti.

3. The method of claim 1 , wherein the ligand is at least one selected from the group consisting of (3-methacryloxypropyl)trimethoxysilane, 2-carboxyethylacrylate, and phosphoric acid 2-hydroxyethyl methacrylate ester.

4. The method of claim 1 , wherein the fluorinated polymer matrix comprises a fluorinated acrylate polymer.

5. The method of claim 1 , wherein the fluorinated polymer matrix is at least one selected from the group consisting of poly(1H,1H,2H,2H-perfluorodecyl methacrylate), poly(vinylidene fluoride), and poly(hexafluoropropylene-co-vinylidene fluoride).

6. The method of claim 1 , further comprising:
milling the reactive nanocomposite to form a reactive powder.

7. The method of claim 1 , further comprising:
incorporating a plurality of additional oxidizer particles into the reactive nanocomposite, the additional oxidizer particles of the plurality comprising at least one selected from the group consisting of a second reactive metal particle, a metal oxide, a complex inorganic oxide, and a polyoxometallate.

8. The method of claim 1 , further comprising:
incorporating a silver salt, an iodine salt, a quaternary ammonium salt, or a combination thereof into the reactive nanocomposite.

9. The method of forming a reactive laminate, the method comprising:
forming a first layer comprising the reactive nanocomposite of claim 1 ;
forming a second layer comprising an energetic material; and
coupling the first layer to the second layer.

10. The method of claim 1 , further comprising:
enclosing the reactive nanocomposite in an external structural shell, comprising at least one selected from the group consisting of a glass fiber composite, a carbon fiber composite, an aramid composite, a monolithic metal, a metal laminate, and a structural polymeric matrix.

11. The method of claim 1 , further comprising:
combining the reactive nanocomposite with a thermosetting polymer matrix, a thermoplastic polymer matrix, or both.

12. A method of using the reactive nanocomposite of claim 1 comprising:
forming the reactive nanocomposite into a reactive nanocomposite structure comprising at least one selected from the group consisting of a liner, a coating, a casing, a sleeve, an insert, a cylinder, a shape charge, a rod, and an open cell foam.

13. The method of claim 12 , further comprising:
filling the reactive nanocomposite structure with at least one selected from a group consisting of an explosive material, a pyrotechnic material, a pyrophoric material, a blast-enhancing material, a fragmentation-enhancing material, and a mechanical shear-inducing material.

14. A printing method comprising:
modifying the reactive nanocomposite of claim 1 to form a reactive nanocomposite fluid, wherein modifying the reactive nanocomposite comprises at least one selected from the group consisting of suspending the reactive nanocomposite in a carrier liquid, dissolving the reactive nanocomposite in a solvent, and heating above a melting point of the reactive nanocomposite; and
depositing a layer of the reactive nanocomposite fluid onto a substrate surface.

15. The method of claim 14 , wherein the reactive nanocomposite fluid further comprises: a pigment or a dye.

16. The method of claim 14 , wherein depositing the reactive nanocomposite further comprises a three-dimensional printing method.

17. The method of claim 14 , further comprising:
depositing a plurality of layers of the reactive nanocomposite fluid onto the surface of the substrate to create a reactive liner.

18. A method of making a reactive nanocomposite foam comprising:
providing the reactive nanocomposite of claim 1 ;
providing an open cell foam defining a core and a plurality of pores;
placing the open cell foam into a mold; and
processing the reactive nanocomposite with the mold such that the reactive nanocomposite infiltrates the open cell foam to fill at least a portion of the pores.

19. The method of claim 18 , further comprising:
filling the core of the open cell foam with at least one selected from the group consisting of an explosive material, a pyrotechnic material, a pyrophoric material, a blast-enhancing material, a fragmentation-enhancing material, and a mechanical shear-inducing material.

20. A method of claim 18 , wherein the mold has a shape selected from the group consisting of a liner, a coating, a casing, a sleeve, an insert, a cylinder, a shape charge, a rod, and a foam.

21. The method of claim 20 , further comprising:
filling the reactive nanocomposite foam structure with at least one selected from the group consisting of an explosive material, a pyrotechnic material, a pyrophoric material, a blast-enhancing material, a fragmentation-enhancing material, and a mechanical shear-inducing material.

Assignees

• Us Of America As Represented By The Secretary Of The Air Force
• Us Air Force

Inventors

• Spowart Jonathan E
• Crouse Christopher A
• Pierce Christian J
• Hardenstein Breanna K

Classifications

• C06B45/00 Primary

  Compositions or products which are defined by structure or arrangement of component of product (explosive charges of particular form or shape F42B1/00, F42B3/00) · CPC title

• C08F2/44

  Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers · CPC title

• B05D3/00

  Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials (successively applying liquids or other fluent materials B05D1/36; drying ovens F26B) · CPC title

• B82Y5/00

  Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery · CPC title

• B32B5/16

  characterised by features of a layer formed of particles, e.g. chips, powder {or granules (layer formed of natural mineral particles B32B19/00; layer being formed of wood fibres, chips or particles B32B21/02)} · CPC title