A method is presented for studying anomalies in the diffusion of gases and vapours in dense polymer films in the transient regime. It was applied to the diffusion of CO2 and water vapour in plasticized-poly (vinylchloride)(PVC)-potato-starch blends. The apparent diffusion coefficient of CO2 in plasticized PVC remains constant in the transient regime, while that of water vapour first increases, passes through a maximum and then finally decreases to a constant value. The anomalous process observed for water vapour permeation in the transient regime can be explained by the interaction between the diisooctylphthalate (DIOP) plasticizer and the deformation of the polymer network due to stresses generated by the starch particles swelling. For water vapour in the stationary regime, the diffusion coefficient decreases and sorption coefficient increases when the starch content increases. There is a strong increase in both sorption and diffusion coefficients when pure PVC is replaced by DIOP-plasticized PVC
Посилання на статтю:
Permeation of carbon dioxide and water vapour in plasticized poly (vinylchloride)-starch blends: anomalous behaviour / X. Q. Nguyen and M. Sipek // Polymer. – 1992. – Vol 33. – P. 3698-3705.