The effect of polyvinyl alcohol on the nitrogen surface area and pore structure of soils

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Abstract
Changes in the specific surface area and pore size distribution due to adsorption of polyvinyl alcohol (PVA) by aggregates of a clay soil have been determined from the desorption isotherms for N at -195[degree]C. The specific surface area was reduced. The volume of pores less than 30 A wide decreased by an amount considerably in excess of the volume of PVA adsorbed. These results are interpreted in terms of "peripheral pore occupation" by the polymer, preventing access of N molecules to pores and surfaces within domains. Adsorption data previously obtained also indicated limited penetration of domains by the polymer.

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