Claims
- 1. A high molecular weight linear polyimide having high strength, modulus, toughness, and solvent resistance, the polyimide having the general structural formula: ##STR45## (a) wherein Ar is a radical selected from the group consisting of: ##STR46## wherein Y is not a substituent or is a substituent selected from the group consisting of:
- O, S, ##STR47## 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: ##STR48## wherein R is a radical selected from the group consisting of: ##STR49## wherein Y is not a substituent or is a substituent selected from the group consisting of:
- O, S, ##STR50## SO.sub.2, CH.sub.2, C(CH.sub.3).sub.2, and C(CF.sub.3).sub.2, and mixtures thereof; and
- (c) wherein n is an integer between 4 and 100.
- 2. A diamine having the general structural formula: ##STR51## wherein R is a radical selected from the group consisting of: ##STR52## wherein Y is not a substituent or is a substituent selected from the group consisting of:
- O, S, ##STR53## SO.sub.2, CH.sub.2, C(CH.sub.3).sub.2, and C(CF.sub.3).sub.2.
- 3. A film from a semi-crystalline 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 made by employees of the United States Government and may be manufactured and used by or for the Government for governmental purposes without the payment of any royalties thereon or therefor.
US Referenced Citations (6)