Highly aromatic and liquid-crystalline co- polyimides endcapped with aromatic groups 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
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Abstract
A family of low-molecular-weight, main-chain thermotropic liquid-crystalline co-polyimides (TLC-CoPI) that are crosslinkable, and based on a unique, liquid-crystallinity (LC)-enabling diamine, namely, 1,3-bis[4-(4′-aminophenoxy)cumyl]benzene (BACB) and two or more mesogenic dianhydrides, at least one of which is a diphthalic dianhydride (DPA) that contains one or more thermally reactive and crosslinkable moieties similar to that of phenylethynyl (PE) is disclosed. Processes of making and using such low-molecular-weight, main-chain thermotropic liquid-crystalline co-polyimides are also provided.
Claims8
A copolymer having the following formula:
- wherein
- n is an integer from 1 to 100;
- each p is 0 or 1;
- each q is 0 or 1 with the proviso the at least one p is 1 and at least one q is 1;
- W has the following formula:
- all X moieties in said copolymer are identical, said X moieties having one of the two formula below wherein R is H Me, OMe, CN or F,
- all Y moieties in said copolymer are identical, said Y moieties having one of the three formula below wherein R is H Me, OMe, CN or F,
- each Z is independently hydrogen or has the following structure
Dependencies are inferred from the claim text.