This paper is a review of the kinetics of diffusion of small-molecule
penetrants in semicrystalline polymers. The variations in diffusion im
pedance resulting from variations in morphology and segmental mobility
in the amorphous component are highlighted. Deviations from Fickian d
iffusion appearing in many systems are discussed, as well as the effec
t of morphology, crystal orientation and chain orientation on the diff
usivity. (C) 1996 Elsevier Science Ltd