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Boron nitride materials with surface areas of 53-696 m2/g and pore volumes 0.036-0.390 cm3/g have been produced by vacuum pyrolysis of poly(4,6-borazinylamine) polymerized under dilute conditions. These samples exhibit type I isotherms, indicating that a majority of the porosity occurs in pores of size less than 1.0 nm. The surface areas and pore volumes are maximized at pyrolysis temperatures of 800 "C, and are essentially eliminated by 1200 "C. Small-angle X-ray scattering (SAXS) measurements confirm this change in structure with pyrolysis temperature.

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