Abstract
Limitations in traditional ceramic processing have encouraged interest in the development and utilization of polymer pyrolyses as low-temperature synthetic routes to nonoxide ceramic materials. Boron carbide is an example of a material where preparation from a polymer precursor might offer advantages over conventional synthetic techniques. Mixed B/sub 4/C-SiC ceramics have, in fact, been previously obtained from pyrolysis of poly(carboranesiloxane) polymers; however, a synthesis of pure B/sub 4/C from polymeric precursors has heretofore not been developed. They report here that 2-(H/sub 2/C=CH)-B/sub 5/H/sub 8/ will undergo thermal polymerization to vinylpentaborane oligomers and that these species can be converted to pure boron carbide (B/sub 4/C) in high ceramic yields under mild conditions.
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