Page 178 - Academic Press Encyclopedia of Physical Science and Technology 3rd Polymer

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Encyclopedia of Physical Science and Technology en012i-947 July 26, 2001 11:11

686 Polymers, Inorganic and Organometallic

synthesis and purification, coupled with their hydrolytic
instability, have inhibited commercialization.

2. Boron–Carbon Polymers: Carboranes
An important group of heteroatom boranes are the
closo-carboranes (or carbaboranes). Closo-carboranes are
FIGURE 25 Three center bonds in boranes. oligomers of boron that contain one or more carbon atoms

FIGURE 26 Neutral and ionic polyhedral borane structures.