Diluent diffusion in polymer-diluent systems near Tg: Migration of phthalic esters from PVC to water

Authors

  • Kenneth F. Zieminski,

    1. School of Chemical Engineering, Purdue University, West Lafayette, Indiȧna 47907
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    • K. F. Zieminski is now with the Department of Chemical, Metallurgical and Polymer Engineering, University of Tennessee, Knoxville, TN 37916.

  • Nikolaos A. Peppas

    1. School of Chemical Engineering, Purdue University, West Lafayette, Indiȧna 47907
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Abstract

A new mathematical model is presented for the description of certain types of diluent diffusion (migration) through diluent–polymer systems. The model describes anomalous diluent transport into a container of finite volume, and it incorporates mass transfer limitations at the polymer/extractant interface. The extractant is assumed to diffuse slowly or negligibly into the polymer. The model is applied to experimental data obtained with two plasticizers, di(2-ethyl-n-hexyl) phthalate and benzyl butyl phthalate, migrating from poly(viny1 chloride) to water.

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