All-aromatic liquid-crystalline homo-polyimides with aromatic endgroups and crosslinked products therefrom
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsLoon-Seng Tan, Zhenning Yu, Bingqian Zheng, Hilmar Koerner, Christopher A. Crouse
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Abstract
A family of low-molecular-weight, main-chain thermotropic liquid-crystalline polyimides (TLC-PI) that are crosslinkable is disclosed. These all-aromatic TLC-PI are derived from (i) wholly aromatic and flexible diamine monomers, in which the linkage between the two aniline-ends contains a relatively high heat-tolerant but flexible chain constituted by two or more units of 1,4-phenoxy or 1,3-phenoxy or in combinations of both. Processes of making and using such all-aromatic TLC-PI is also provided.
Claims7
A process of making an article comprising injection molding, and/or 3D printing a polyimide or a polymer mixture comprising at least 1% by weight of said polyimide, said polyimide having the following formula:
- wherein:
- n is an integer from 6 to 18;
- each W is identical and is selected from one of the following formula:
- where m is 0 or 1
- where each m is independently 1 or 2,
- Ar has one of the following formula,
- wherein R is H, or F;
- each Z is independently hydrogen or has the following structure:
Dependencies are inferred from the claim text.