Materials and methods for nucleating aligned thermoplastic crystals while fabricating thermoplastic carbon fiber reinforced polymer structures

Patent metadata

Field	Value
Publication number	US-10682822-B2
Application number	US-201815933559-A
Country	US
Kind code	B2
Filing date	Mar 23, 2018
Priority date	Mar 23, 2018
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

The present disclosure relates to methods and systems for making thermoplastic resin materials and composite resin systems and materials made from the thermoplastic resins, by seeding one melted thermoplastic material with a second thermoplastic material in a crystalline state that comprises an amount of ferromagnetic material.

First claim

What is claimed is:

1. A method of preparing an oriented thermoplastic resin, the method comprising:
heating a thermoplastic resin to a predetermined temperature to generate a melted thermoplastic resin, said thermoplastic resin comprising:
a first thermoplastic resin material having a first melting point; and
a second thermoplastic resin material having a second melting point;

wherein said second thermoplastic resin material is in a crystalline state and said second thermoplastic resin material further comprises a ferromagnetic material; and
wherein the predetermined temperature is a temperature that is at or above the first melting point and below the second melting point;
applying a magnetic field to the melted thermoplastic resin for a predetermined amount of time; and
cooling the melted thermoplastic resin to form the oriented thermoplastic resin.

2. The method of claim 1 , further comprising:
orienting the second thermoplastic resin material in alignment relative to the magnetic field;
wherein the step of orienting is substantially coincident with the step of applying a magnetic field.

3. The method of claim 1 , wherein the step of cooling the melted thermoplastic resin, further comprises:
forming crystals in the first thermoplastic resin material, wherein said crystals are aligned relative to the second thermoplastic resin material.

4. The method of claim 1 , wherein the ferromagnetic material comprises at least one of: iron, iron oxide, cobalt, nickel, and permalloy.

5. The method of claim 1 , wherein the second melting point is greater than the first melting point by a temperature difference between the first melting point and the second melting point, said temperature difference ranging from about 10° F. to about 50° F.

6. The method of claim 1 , wherein the second thermoplastic resin material substantially encapsulates the ferromagnetic material.

7. The method of claim 1 , wherein, in the step of cooling the melted thermoplastic resin to form an oriented thermoplastic resin, the oriented thermoplastic resin crystallizes to a substantially uniform orientation.

8. The method of claim 1 , further comprising:
nucleating the first thermoplastic resin material with the second thermoplastic resin material;
wherein the step of nucleating precedes the step of applying a magnetic field to the melted thermoplastic resin for a predetermined amount of time.

9. The method of claim 1 , wherein the step of cooling the melted thermoplastic resin to form the oriented thermoplastic resin further comprises:
forming a thermoplastic resin having grain sizes ranging from about 100 μm to about 1 mm.

10. The method of claim 1 , wherein the step of cooling the melted thermoplastic resin to form the oriented thermoplastic resin further comprises:
forming a thermoplastic resin having grain sizes ranging from about 1 mm to about 10 mm.

11. The method of claim 1 , wherein the step of applying a magnetic field to the melted thermoplastic resin further comprises:
applying the magnetic field to the melted thermoplastic resin at a magnetic flux density ranging from about 0.1 T to about 1 T.

12. A thermoplastic resin made according to the method of claim 1 .

13. A composite material comprising a thermoplastic resin made according to the method of claim 1 .

14. A method of seeding crystal growth in a seeded thermoplastic resin, the method comprising:
introducing a second thermoplastic resin material in a crystalline state to a first thermoplastic resin material to form a seeded thermoplastic resin mixture, said second thermoplastic resin material having a higher melting point than the first thermoplastic resin material, and said second thermoplastic resin material comprising an amount of a ferromagnetic material that is responsive to a magnetic flux density ranging from about 0.1 T to about 1T;
applying a magnetic field having a magnetic flux density ranging from about 0.1T to about 1T to the seeded thermoplastic resin mixture, thereby orienting the second thermoplastic resin material relative to the magnetic field to form an oriented second thermoplastic resin material; and
cooling the seeded thermoplastic resin mixture to form crystal growth in the seeded thermoplastic resin mixture, said crystals aligned with the second thermoplastic resin material.

15. A thermoplastic resin material mixture, comprising:
a first thermoplastic resin material having a first melting point, said first thermoplastic resin material in a melted state;
a second thermoplastic resin material, said second thermoplastic resin material comprising an amount of a ferromagnetic material, and said second thermoplastic resin material having a second melting point, and said second thermoplastic resin material in a crystalline state;
wherein the second melting point exceeds the first melting point by a temperature difference ranging from about 10° F. to about 50° F.; and
wherein the thermoplastic resin material mixture is in a substantially uniformly oriented state.

16. The thermoplastic resin material mixture of claim 15 :
wherein the first thermoplastic resin material comprises polyether ether ketone; and
wherein the second thermoplastic resin material comprises polyether ketone ketone and an amount of ferromagnetic material responsive to a magnetic force, said magnetic force having a magnetic flux density ranging from about 0.1T to about 1 T.

17. A composite material comprising the oriented thermoplastic resin made according to the method of claim 14 .

18. The composite material of claim 17 , wherein the oriented crystalline thermoplastic resin material comprises grain sizes ranging from about 10 μm to about 1 mm.

19. An object comprising the composite material of claim 17 .

20. A vehicle comprising the object of claim 19 , wherein said vehicle comprises at least one of: a manned aircraft, an unmanned aircraft, a manned spacecraft, an unmanned spacecraft, a manned rotorcraft, an unmanned rotorcraft, a manned terrestrial vehicle, an unmanned terrestrial vehicle, a manned surface water borne vehicle, an unmanned surface water borne vehicle, a manned sub-surface water borne vehicle, an unmanned sub-surface water borne vehicle, and a satellite.

Assignees

• Boeing Co

Inventors

• Humfeld Keith D
• Hartshorn Scott

Classifications

• Y10T428/24893

  including particulate material · CPC title

• Y10T428/24802

  Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] · CPC title

• C08J5/249

  characterised by the additives used in the prepolymer mixture · CPC title

• C08J5/243 Primary

  using carbon fibres · CPC title

• C08J2377/00

  Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers · CPC title