Claims
- 1. A high molecular weight linear polyimide having high strength and toughness and a degree of solubility in organic solvents, which polyimide can be induced to crosslink or chain extend to form an insoluble polymer network, the polyimide having the general structural formula: ##STR11## (a) wherein Ar is a radical selected from the group consisting of: ##STR12## 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,C(CF.sub.3).sub.2, and Si(CH.sub.3).sub.2 ;
- (b) wherein Ar' is a radical having the structural formula selected from the group consisting of: ##STR13## wherein R is a radical selected from the group consisting of: ##STR14## 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,C(CF.sub.3).sub.2,Si(CH.sub.3).sub.2 ;
- wherein x is an integer between 1 and 10;
- wherein R' is CH.sub.3 ;
- wherein R" is either H or CH.sub.3 ; and
- wherein n is an integer between 4 and 100.
- 2. A diamine having the general structural formula: ##STR15## wherein R is a radical selected from the group consisting of: ##STR16## 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,C(CF.sub.3).sub.2, and Si(CH.sub.3).sub.2 ;
- wherein x is an integer between 1 and 10;
- wherein R' is CH.sub.3 ; and
- wherein R" is either H or CH.sub.3.
- 3. A diamine having the general structural formula: ##STR17## wherein R is a radical selected from the group consisting of: ##STR18## 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,C(CF.sub.3).sub.2, and Si(CH.sub.3).sub.2 ;
- wherein x is an integer between 1 and 10;
- wherein R' is CH.sub.3 ; and
- wherein R" is either H or CH.sub.3.
- 4. A high molecular weight linear polyimide according to claim 1, which has been thermally crosslinked to form insoluble polymer networks therein.
- 5. A high molecular weight linear polyimide according to claim 1, which has been photolytically crosslinked to form insoluble polymer networks therein.
- 6. A thermally crosslinked high molecular weight linear polyimide according to claim 4 in the form of a film which has been thermally cured in air.
- 7. A thermally crosslinked high molecular weight linear polyimide according to claim 5 in the form of a film which has been exposed to ultraviolet radiation.
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 (1)
Number |
Name |
Date |
Kind |
4820791 |
Hergenrother et al. |
Apr 1989 |
|