ADSORPTION OF ALKYL P-HYDROXYBENZOATES FROM AQUEOUS-SOLUTION ONTO TEFLON

Earlier evidences for the adsorption of a homologous series of alkyl p -hydroxybenzoates onto Teflon are confirmed by direct measurements. Th e kinetic analysis suggests that the adsorption occurs via two consecu tive processes: flat adsorption followed by the solute reorientation a t the polymer surface. The adsorption isotherms confirm that the stren gth of interaction increases with the solute hydrophobicity, An increa sed wettability of the Teflon surface was also observed to occur paral lel to the adsorption, suggesting the presence of some oriented solute molecules which reduce the interfacial tension between the polymer an d water. (C) 1996 Academic Press, Inc.