ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Diffusion in polypropylene. I. Kinetics of desorption of water

J. Očadlík and L. Valko

Slovak Technical University, Bratislava

Abstract: The desorption of H₂O from isotactic polypropylene at 23° after thermal oxidative destruction at 120° for O to 8 hrs. was studied. Diffusion coeffs. and soly. of H₂O in polypropylene were calcd. and kinetic desorption processes evaluated. From the kinetic analysis it was detd. that the diffusion of H₂O in polypropylene is governed by the 2nd Fourier-Fick law (cf. Barber, Diffusion in and through Solids, 1952 (CA 46, 4902i)), i.e. the diffusion coeffs. are not a function of H₂O concn. Soly. of H₂O in the 1st phases of the oxidn. is in the amorphous portion of the polypropylene. The sudden increase in soly. after prolonged oxidn. is caused by an increase in the destruction and by an increase in polar oxidn. products.

Full paper in Portable Document Format: 145a345.pdf (in Slovak)

Chemical Papers 14 (5) 345–352 (1960)