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Simple molecular parameters, describing affinity and size, are shown to model permeation of Challenge 5100R and Challenge 5200R materials (fiber-reinforced fluoropolymers). Solubility parameter eodels based on permeation test data are described, and shown to be very similar for the two materials. Figures combining both solubility parameter affinities and size parameters are presented as potential predictive models for the barrier effectiveness of the materials. The size parameter and the presence of double bonds are shown to have a profound influence on permeation. The results from this model are described, and evaluated using data obtained before and after model development. The model is compared with a different empirical model developed by Arthur D. Little, Inc. (ADL). The ADL model uses a rule system to predict permeation through the fluoropolymer materials based on the structure and size of the challenge chemical. Both approaches correctly describe the permeation behavior in about 90% of the cases in the present data set.
fluoropolymer, solubility parameter, affinity parameter, size parameter, permeation models
Senior Scientist, Isotopcentralen, FORCE Institutterne, Brondby,
Senior Biometrician, Pfizer, Inc., Groton, CT
Project Manager, U.S. Coast Guard R&D Center, Groton, CT