Pore structure changes of hot-pressed organic compounds by mercury porosimetry

Abstract

Changes in the pore structure were searched by the measurement pore size distribution and cumulative pore volume, on cinnamic acid and adipic acid compacts hot-pressed at various temperatures and pressures. Studies are mainly on the initial and intermediate stages of the densification during which plastic flow mechanism predominates. When hot-pressed under the constant pressure, the total pore volume decreased rapidly with increasing temperature, particularly near the melting point, and pores shrank uniformly with keeping their similar shape. On the other hand, when hot-pressed under the constant temperature, pore volume decreased with increasing pressure but the degree of volume decrease became less when the pressure was high. Furthermore the larger pores shrank rapidly than the smaller ones in contrast to the former case.