Bis-Schiff-base thermosetting elastomers
Chemical compositions are provided having a structure in accordance with with the R group having a structure in accordance with R 1 includes an alkyl group, R 2 includes an alkylene group, and R 3 includes an alkylene group in accordance with (CH 2 ), with x≥2, and R 4 includes the structure of Formula (II) or Formula (III). R 5 includes a meta-substituted or para-substituted phenyl moiety. Additionally, elastomers produced by cross-linking the chemical composition of Formula (I) are provided.
1. A chemical composition comprising the structure of Formula (I):
wherein:
R comprises the structure of Formula (II) or Formula (IV):
wherein, R 1 comprises an alkyl group and R 2 comprises an alkylene group and n represents any integer greater than or equal to zero;
wherein, R 3 comprises an alkylene group in accordance with (CH 2 ) x with x≥2 and n represents any integer greater than or equal to 1; and
wherein, n′ represents any integer greater than or equal to 1, R 4 comprises the structure of Formula (II) or Formula (III), and R 5 comprises the structure of Formula (V) or Formula (VI):
2. An elastomer produced by cross-linking a chemical composition comprising the structure of Formula (I):
wherein:
R comprises the structure of Formula (II) or Formula (IV):
wherein, R 1 comprises an alkyl group and R 2 comprises an alkylene group and n represents any integer greater than or equal to zero;
wherein, R 3 comprises an alkylene group in accordance with (CH 2 ) x with x≥2 and n represents any integer greater than or equal to 1; and
wherein, n′ represents any integer greater than or equal to 1, R 4 comprises the structure of Formula (II) or Formula (III), and R 5 comprises the structure of Formula (V) or Formula (VI):
3. The elastomer of claim 2 , wherein R comprises the structure of Formula (II).
4. The elastomer of claim 3 , wherein n is equal to 200 to 500, R 1 represents methyl groups, and R 2 represents a n-alkylene group.
5. The elastomer of claim 2 , wherein R comprises the structure of Formula (IV).
6. The elastomer of claim 5 , wherein n′ is equal to 1 to 10, R 4 represents an aminobenzoate terminated linear alkyl polyether moiety in accordance with Formula (III) where n is equal to 5 to 20, R 3 represents a n-alkylene group, and R 5 represents a meta-substituted phenyl moiety in accordance with Formula (V).
7. The elastomer of claim 2 , wherein the cross-linking is achieved by heating the chemical composition at 120 to 180° C. for 4 to 16 hours at approximately 760 mmHg.
8. The elastomer of claim 2 , wherein the char yield at pyrolysis at 800° C. for the elastomer is greater than 10 wt. %.
9. The elastomer of claim 2 , wherein the elastomer is used in at least one of an architecture, coating, construction, oil and gas, mining, defense, space, aerospace, automotive, marine, manufacturing, or electronic industries.
10. A polymer composite, the polymer composite comprising:
the elastomer of claim 2 , and
one or more reinforcement fillers integrated with the chemical composition prior to cross-linking.
11. The polymer composite of claim 10 , wherein the reinforcement filler comprises one or more of a nanoclay, a nanofiber, and chopped para-aramid synthetic fiber.
12. The polymer composite of claim 11 , wherein the para-aramid-synthetic fiber comprises poly-paraphenylene terephthalamide fibers.
13. The polymer composite of claim 10 , wherein the reinforcement filler has a final loading in the range of 1 wt. % to 30 wt. %.
14. The polymer composite of claim 10 , wherein the char yield at pyrolysis at 800° C. for the polymer composite is greater than 12 wt. %.
15. The polymer composite of claim 10 , wherein:
the R group of the elastomer comprises the structure of Formula (III) with wherein n equal to 5 to 20 and R 3 representing a n-alkylene group; and
the one or more reinforcement fillers comprise aramid fiber and fumed silica.
16. A high temperature insulation comprising an elastomer produced by cross-linking a chemical composition comprising the structure of Formula (I):
wherein:
R comprises the structure of Formula (II) or Formula (IV):
wherein, R 1 comprises an alkyl group and R 2 comprises an alkylene group and n represents any integer greater than or equal to zero;
wherein, R 3 comprises an alkylene group in accordance with (CH 2 ) x with x≥2 and n represents any integer greater than or equal to 1; and
wherein, n′ represents any integer greater than or equal to 1, R 4 comprises the structure of Formula (II) or Formula (III), and R 5 comprises the structure of Formula (V) or Formula (VI):
17. The high temperature insulation of claim 16 , wherein the high temperature insulation further comprises one or more reinforcement fillers integrated with the chemical composition prior to cross-linking to form a polymer composite, the reinforcement filler selected from nanoclays, nanofibers, and chopped para-aramid synthetic fibers.
18. The high temperature insulation of claim 16 , wherein the high temperature insulation material is configured for use as solid rocket motor insulation.