Abstract
Among the hydrous silicates belonging to the serpentine, amphibole, and clay mineral families, chrysotile, crocidolite and attapulgite fibers reacted most strongly with phosphorus oxychloride. While the reactivity of crocidolite was linked mainly to the sodium cations of its structure, the reactivities of chrysotile and attapulgite correlated best with their high hydroxyl group content. The TG/DTG curves of chrysotile and attapulgite revealed significant modifications of their dehydroxylation profiles. IR spectra and specific surface measurements confirmed that, most probably, the phosphorylation process created: (a) a phosphorus coating at the surface of the chrysotile fibers, and (b) an obstruction of the pores by phosphorus compounds with the attapulgite fibers.
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