Showing papers by "Kenneth A. Mauritz published in 1991"

A general free volume based theory for the diffusion of large molecules in amorphous polymers above Tg. 4. Polymer-penetrant interactions

Abstract: A theory previously proposed is refined to include a more realistic and molecular-based accounting of important polymer-penetrant interactions. The general diffusion equation has been appropriately modified to include an explicit activation energy for diffusion. Plasticizer-in-PVC intermolecular energies were calculated for a series of dialkyl phthalate plasticizers and were then employed in the modified diffusion equation to predict diffusion coefficients (D). The results show a remarkable improvement over previous calculations

A general free-volume-based theory for the diffusion of large molecules in amorphous polymers above glass temperature. 5. Application to dialkyl adipate plasticizers in poly(vinyl chloride)

Abstract: It is shown that the theory compares well with experimental results in predicting dialkyl adipate diffusion coefficients as a function of temperature in the region just above the unplasticized T g of PVC