|United States Patent||5,317,058|
|Dougherty, et. al.||May 31, 1994|
|Inventors:||Dougherty; Thomas K. (Playa Del Rey, CA); Harris; Norman H. (Newhall, CA); Chow; James R. (Alhambra, CA); Pierce; Brian M. (Moreno Valley, CA); Whelan; David A. (Chatworth, CA).|
|Assignee:||Hughes Aircraft Company (Los Angeles, CA).|
|Filed:||Apr. 17, 1992|
|Intl. Cl.:||C08G 63/91; C08G 79/08; C08F 8/00; C08F 4/52;|
|U.S. Cl.:||525/64.; 523/137.;|
|Field of Search:||4;5 |
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A microwave-absorbing material composed of blends of polar icosahedral molecular units with a variety of host matrices, or with polymers with the units covalently bonded in a pendant manner to the polymer chain. Both blends and polymers must impart a high degree of orientational mobility to the units so that they can absorb microwave radiation. These materials employ orientationally mobile, polar icosahedral molecular units as the source of dielectric loss at microwave frequencies. Examples of these units are the polar carboranes (ortho- and meta-carborane), polar carboranes with electronegative and/or electropositive substitutes, and polar "buckminsterfullerenes."
This invention was made with Government support under Contract N00019-88-C-0208 awarded by the Department of the Navy. The Government has certain rights in this invention.