of volume filling of micropores
In the work an attempt to apply the notions of physical adsorption of liquid non-electrolytes from solutions, in particular the theory of volume filling of micropores, to the description of the plasticization process taking place in PVC plastisols was presented. This process is in a state of a thermodynamic equilibrium. As plasticizing composition a homogeneous mixture of a primary plasticizer (di-n-butyl phthalate) and a secondary plasticizer (Santicizer S-429, a saturated polyester) or a mixture of a primary plasticizer and a modifier (Kreolak 102 FK, an epoxyphenolic resin was used. It was found that the plasticization process in PVC plastisols comprises diffusion of dibutyl phthalate deep into the structure of PVC grain and its solvation, whereas a secondary plasticizer Or modifier forms an adsorption layer. Removal of impurities from PVC grains promoted solvation and adsorption.
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