Patent ID: 11926726
Assignee: UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 7:
8. The process of claim 3 wherein said one or more copolyimides comprising endcaps and a backbone, said endcaps and/or said backbone comprising sulfur, have Structure VI below and wherein for each of said one or more copolyimides the indices and variables provided in Structures VI are independently selected:, a) the index p is independently an integer from 5 to 300;
b) x is a non-zero number less than 1, and the ratio for x:(1-x) is 0.01:0.99 to 0.20:0.80;
c) the subscripts a and b are indices for the molar fractions of Q and T, each with the range of 0.05 to 0.95, respectively, and the sum of a and b is unity;
d) the index m is 1 or 2;
e) L is a covalent bond, or a linking group having one of the following structures:, f) Q and T are homopolyimides having Structure VII below:, wherein
i) for each homopolyimide Q and T, the index n is an integer from 5 to 300;
ii) for each homopolyimide Q and T, W is independently a covalent bond, or a linking group having one of the following structures:, iii) for each homopolyimide Q and T, J has one of the following structures with the proviso that J for Q and T is different:, wherein:
X is a linking group having one of the following structures:, Y is a covalent bond, or a linking group having one of the following structures:, and
Z is one of the following structures:,