Claims
- 1. A high molecular weight linear polyimide having high strength, modulus, toughness, and solvent resistance, and having the general structural formula: ##STR27## (a) wherein Ar is a radical selected from the group consisting of: ##STR28## wherein Y is a band or is a substituent selected from the group consisting of:
- O, S, C.dbd.O, SO.sub.2, CH.sub.2, C(CH.sub.3).sub.2, C(CF.sub.3 l).sub.2 and Si(CH.sub.3).sub.2 ;
- (b) wherein Ar' is a radical selected from a group consisting of:
- (1) a radical having the structural formula: ##STR29## wherein R is a radical selected from the group consisting of:
- --(CH.sub.2).sub.z --and --(CF.sub.2).sub.z --,
- wherein z is an integer between 1 and 10;
- (2) a radical having the structural formula: ##STR30## wherein R' is selected from the group consisting of ##STR31## wherein Y is a bond or is a substituent selected from the group consisting of:
- O, S, C.dbd.O, SO.sub.2, CH.sub.2, C(CH.sub.3).sub.2, and C(CF.sub.3).sub.2 ;
- (3) a radical having the structural formula: ##STR32## (c) wherein n is an integer between 4 and 100.
- 2. A diamine having the general structural formula: ##STR33## wherein R is a radical selected from the group consisting of:
- --(CH.sub.2).sub.z --and --(CF.sub.2).sub.z --;
- wherein z is an integer between 1 and 10.
- 3. A diamine having the general structural formula: ##STR34## wherein R' is selected from the group consisting of: ##STR35## wherein Y is a bond or is a substituent selected from the group consisting of:
- O, S, C.dbd.O, SO.sub.2, CH.sub.2, C(CH.sub.3).sub.2, and C(CF.sub.3).sub.2.
- 4. A diamine having the general structural formula: ##STR36##
- 5. A film from a polyimide according to claim 1 which is unaffected by immersion in a strong base for up to 18 hours.
ORIGIN OF THE INVENTION
The invention described herein was jointly made in the performance of work under a NASA Contract and is subject to the provisions of Section 305 of the National Aeronautics and Space Act of 1958, as amended, Public Law 85-568 (72 Stat. 435; 42 USC 2457).
US Referenced Citations (3)
Number |
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Date |
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Mar 1970 |
|
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|
4820791 |
Hergenrother et al. |
Apr 1989 |
|
Non-Patent Literature Citations (1)
Entry |
Hergenrother et al., "Polyimides" Denver Amer. Chem. Symposium Apr. 1987. |