Highly aromatic and liquid-crystalline homo-polyimides with aromatic endgroups and crosslinked products therefrom
Applicants disclose a family of low-molecular-weight, main-chain thermotropic liquid-crystalline polyimides (TLC-PI) that are thermally crosslinkable and processes of making and using same. Such materials provide flexibility advantage when modifying ink materials to meet varying processing conditions in additive manufacturing of devices and components that require high-temperature polymers.
1 . A polyimide, said polyimide being a thermotropic liquid crystal, said polyimide having the following formula:
wherein:
n is an integer from 2 to 100;
each Z is independently hydrogen or a phenylethynyl group;
W has the following formula
Ar has one of the following formula:
wherein R is OMe, CN or F.
2 . The polyimide of claim 1 wherein n is an integer of 4 to 20.
3 . The polyimide of claim 1 wherein n is an integer of 6 to 18.
4 . The polyimide of claim 1 wherein R is OMe or F.
5 . The polyimide of claim 1 wherein R is F.
6 . The polyimide of claim 1 wherein Ar has one of the following formula:
wherein R is OMe, CN or F.
7 . The polyimide of claim 6 wherein n is an integer of 4 to 20.
8 . The polyimide of claim 6 wherein n is an integer of 6 to 18.
9 . The polyimide of claim 6 wherein R is OMe or F.
10 . The polyimide of claim 6 wherein R is F.
11 . The polyimide of claim 1 wherein for the structure
R is OMe, CN or F.
12 . The polyimide of claim 11 wherein R is F.
13 . The polyimide of claim 6 wherein for the structure
R is OMe, CN or F.
14 . The polyimide of claim 13 wherein R is F.