Claims
- 1. A thermally stable polymer consisting essentially of recurring units having the following formula: ##SPC7##
- wherein R.sub.f ' is (CF.sub.2).sub.2 O(CF.sub.2).sub.5 O(CF.sub.2).sub.2 ; ##EQU1## or (CF.sub.2).sub.2 O(CF.sub.2).sub.2 O(CF.sub.2).sub.2 O(CF.sub.2).sub.5 O(CF.sub.2).sub.2 ; R.sub.f is (CF.sub.2).sub.4 O(CF.sub.2).sub.4 O(CF.sub.2).sub.4 ; CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.a (CF.sub.2).sub.5 O(CF.sub.2 CF.sub.2 O).sub.b CF.sub.2, where a+b equals 4 or 7; or ##EQU2## where Y is (CF.sub.2).sub.4 O-- or ##EQU3## x is an integer from 1 to 5, inclusive, and n is an integer having a value such that the polymer has an inherent viscosity from about 0.10 to 1.0 when measured at 25.degree. C as a 0.2 weight percent solution in hexafluoroisopropanol.
- 2. The thermally stable polymer of claim 1 in which R.sub.f ' is (CF.sub.2).sub.2 O(CF.sub.2).sub.5 O(CF.sub.2).sub.2 and R.sub.f is (CF.sub.2).sub.4 O(CF.sub.2).sub.4 O(CF.sub.2).sub.4.
- 3. The thermally stable polymer of claim 1 in which R.sub.f ' is (CF.sub.2).sub.2 O(CF.sub.2).sub.5 O(CF.sub.2).sub.2 and R.sub.f is CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.a (CF.sub.2).sub.5 O(CF.sub.2 CF.sub.2 O).sub.b CF.sub.2, where a+b equals 4.
- 4. The thermally stable polymer of claim 1 in which R.sub.f ' is (CF.sub.2).sub.2 O(CF.sub.2).sub.5 O(CF.sub.2).sub.2 and R.sub.f is CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.a (CF.sub.2).sub.5 O(CF.sub.2 CF.sub.2 O).sub.b CF.sub.2, where a+b equals 7.
- 5. The thermally stable polymer of claim 1 in which R.sub.f ' is ##STR12## and R.sub.f is (CF.sub.2).sub.4 O(CF.sub.2).sub.4 O(CF.sub.2).sub.4.
- 6. The thermally stable polymer of claim 1 in which R.sub.f ' is (CF.sub.2).sub.2 O(CF.sub.2).sub.2 O(CF.sub.2).sub.2 O(CF.sub.2).sub.5 O(CF.sub.2).sub.2 and R.sub.f is CF.sub.2 O(CF.sub.2 CF.sub.2 O).sub.a (CF.sub.2).sub.5 O-- (CF.sub.2 CF.sub.2 O).sub.b CF.sub.2, where a+b equals 7.
RIGHTS OF THE GOVERNMENT
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
Non-Patent Literature Citations (1)
Entry |
journal of Applied Polymer Science--vol. 19, pp. 2731-2741 (1975). |