The significance of the zero-concentration diffusivity value obtained from integral desorption data

• n-Hexane zero-concentration diffusivity in high density polyethylene obtained 'indirectly' from integral desorption measurements using the free volume concept was compared with the zero-concentration diffusivity obtained directly at low-n-hexane activities using a quartz-ring system. The difference between the results obtained by the indirect and direct methods was within the experimental error. The concentration dependence of the diffusivity predicted by the Cohen-Turnll-Fujita free volume theory was in accordance with experimental data.

Nyckelord

diffusion

sorption

desorption

small-molecule penetrants

free-volume

coefficients

polyethylene

membranes

kinetics

polymers

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)