Abstract
The aim of this work is to examine the pyrolysis and thermal properties of new and aged membranes. The results showed that the physical/chemical properties of membranes were changed after thermal aging. The onset decomposition temperature of the aged membrane was higher than that of the new one, whereas the maximum mass loss rate was reversed. The predicted thermogravimetric data by the ANN model, coincided well with the experimental data for both new and aged membranes. The average activation energy of the new membrane estimated by isoconversional methods was relatively higher than that of the aged one. A two-stage reaction modeling was employed to describe the degradation of new and aged membranes. The reaction mechanism of each stage was determined by the generalized master-plots method. The significant difference in reaction model between new and aged membranes was observed. Besides, the aged membrane released pyrolysis products later and less but faster than the new one. The burning results indicated that the aged membrane exhibited lower flammability and less heat release compared with the new one. The variation of pyrolysis and thermal behaviors between new and aged membranes was due to the changes of chemical component, molecular structure, and composition proportion.
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