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Study of the preparation of plasticized PVC with a surface with barrier properties
Author(s) -
Aboutaybi A.,
Bouzon J.,
Vergnaud J. M.
Publication year - 1990
Publication title -
journal of vinyl technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 0193-7197
DOI - 10.1002/vnl.730120203
Subject(s) - plasticizer , polymer , materials science , diffusion , chemical engineering , process (computing) , composite material , polymer chemistry , thermodynamics , computer science , physics , engineering , operating system
Plasticized PVC sheets are often used in packaging for blood or liquid foods, as well as cosmetics or solvents. Two matter transfers may take place: the liquid entering the PVC, and the plasticizer leaving the solid. These transfers are detrimental to the polymer, which becomes less flexible, and to the liquid, which is polluted. A two‐step process for preparing plasticized PVC samples with low matter transfers is studied. The polymer is immersed into a liquid for a short time and then dried. At the end of the process, a steep gradient of concentration is obtained next to the PVC surface both for the plasticizer and the liquid, with a low concentration on the surface. As the process of transport is controlled by diffusion with concentration‐dependent diffusivities, very low initial rate of transport is obtained for the final PVC. Models based on numerical methods with finite differences are used in order to describe the process and provide a fuller insight of its mechanism.