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Poly(p-phenylene benzobisoxazole) (PBO) was impregnated with small amounts of H 3 PO 4 , and the effects of this additive on the porosity and other characteristics of chars and activated carbon fibers (ACFs) derived from this polymer were investigated. To this end, PBO-AS impregnated with 5, 10 or 15wt.% H 3 PO 4 was pyrolyzed at 850°C, and the resulting chars were...
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