DIFFUSION COEFFICIENTS IN POLYMER-SOLVENT SYSTEMS FOR HIGHLY CONCENTRATED POLYMER SOLUTIONS

The Vrentas/Duda proposal for the diffusion of polymer-solvent systems, which is based on the free-volume theory, was employed in correlating and predicting mutual diffusion coefficients in highly concentrated polymer solutions. It has been observed that the predictive version of the model is capable of qualitatively representing the experimental data, while the use of an adjustable parameter greatly improves the performance of the model. The systems studied were poly(vinyl) acetate-toluene and Neoprene-acetone, and a comparison between experimental data and calculated values from the Vrentas/Duda model is reported. A new experimental apparatus based on the sorption technique was built to provide reliable diffusivity data on the Neoprene-acetone system.

Bibliographic Details

Main Authors:	Reis,R.A., Vladimir Oliveira,J., Nobrega,R.
Format:	Digital revista
Language:	English
Published:	Brazilian Society of Chemical Engineering 2001
Online Access:	http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66322001000400003
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