Polybenzoxazine resins with high hydrogen content, and composites therefrom

Patent metadata

Field	Value
Publication number	US-11124608-B2
Application number	US-201916375415-A
Country	US
Kind code	B2
Filing date	Apr 4, 2019
Priority date	Apr 4, 2018
Publication date	Sep 21, 2021
Grant date	Sep 21, 2021

Abstract

A material with significant protection properties from galactic cosmic radiation and solar energetic particles. Hydrogen-rich benzoxazines which are particularly effective for shielding against such radiation. Benzoxazine resin meets the processing requirements for use with ultra-high molecular weight polyethylene fiber as a hydrogen-rich reinforcement: cure of the resin at 120° C. This highly reactive benzoxazine resin also exhibits low viscosity and adequate shelf life.

First claim

What is claimed is:

1. A benzoxazine resin of the chemical structure:

wherein 2≤a≤18, 0≤b≤6, and 0≤c≤6.

2. A polybenzoxazine formed by polymerization of the benzoxazine of claim 1 .

3. The polybenzoxazine according to claim 2 , formed by polymerization using a cure cycle for which a maximum temperature does not exceed about 120° C.

4. A polybenzoxazine formed by polymerization of the benzoxazine of claim 1 , wherein 6≤a≤14, 2≤b≤4, and 2≤c≤4.

5. The polybenzoxazine according to claim 4 , formed by polymerization using a cure cycle for which a maximum temperature does not exceed about 120° C.

6. The benzoxazine resin of claim 1 , wherein c is equal to b.

7. The benzoxazine resin according to claim 6 , wherein 6≤a≤18 and 1≤b≤6.

8. A polybenzoxazine formed by cure of the benzoxazine of claim 6 .

9. The polybenzoxazine according to claim 8 , formed by polymerization using a cure cycle for which a maximum temperature does not exceed about 120° C.

10. The polybenzoxazine according to claim 8 , 6≤a≤14 and 2≤b≤4.

11. The polybenzoxazine according to claim 10 , formed by polymerization using a cure cycle for which a maximum temperature does not exceed about 120° C.

12. The polybenzoxazine according to claim 8 , wherein a=12 and b=3.

13. A material, comprising:
a) 1 to 99% by weight of a polybenzoxazine formed by cure of a benzoxazine resin of the chemical structure:

wherein 2≤a≤18, 0≤b≤6, and 0≤c≤6; and
b) 99% to 1% by weight of polyethylene.

14. The material according to claim 13 , wherein the polyethylene comprises one or more of a high-density polyethylene and an ultra-high molecular weight polyethylene.

15. The material according to claim 14 , wherein 6≤a≤14, 2≤b≤4, and 2≤c≤4.

16. The material according to claim 15 , wherein a=12 and b=c=3.

17. A material, comprising:
a) 5 to 95% by volume of a polybenzoxazine formed by cure of a benzoxazine resin of the chemical structure:

wherein 6≤a≤18, 1≤b≤6, and 1≤c≤6; and
b) 95% to 5% by volume of fibrous reinforcement.

18. The material according to claim 17 , wherein the fibrous reinforcement comprises continuous fiber or woven continuous fiber.

19. The material according to claim 18 , wherein the fibrous reinforcement comprises one or more of a polyethylene fiber, carbon fiber, and boron fiber.

20. The material according to claim 17 , wherein 6≤a≤14, 2≤b≤4, and 2≤c≤4.

21. The material according to claim 20 , wherein a=12 and b=c=3.

22. The material according to claim 17 , wherein the material comprises:
a) 30% to 95% by volume of the polybenzoxazine, wherein a=12 and b=c=3, and b) 5% to 70% by volume of the fibrous reinforcement, and wherein the fibrous reinforcement is woven high density polyethylene fiber.

23. A molded object comprising the material of claim 22 .

24. A material, comprising:
a) 5 to 95% by volume of a polybenzoxazine formed by cure of a benzoxazine resin of the chemical structure:

wherein 6≤a≤18, 1≤b≤6, and 1≤c≤-6; and
b) 95% to 5% by volume of a fibrous electrical conductor.

25. The material according to claim 24 , wherein the fibrous electrical conductor comprises continuous fiber or woven continuous fiber.

26. The material of claim 25 , wherein the fibrous electrical conductor comprises copper.

27. The material according to claim 24 wherein 6≤a≤14, 2≤b≤4, and 2≤c≤4.

28. The material according to claim 27 wherein a=12 and b=c=3.

Assignees

• Univ Case Western Reserve
• Mat Answers Llc

Inventors

• Scott Christopher E
• Ishida Hatsuo
• Winroth Scott Allen

Classifications

• C08J5/04

  Reinforcing macromolecular compounds with loose or coherent fibrous material · CPC title

• C08L23/06

  Polyethylene · CPC title

• C08J2379/02

  Polyamines · CPC title

• C08L2207/068

  Ultra high molecular weight polyethylene · CPC title

• C08J2379/04

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors · CPC title