Abstract
Initial decomposition temperature ( T i), apparent activation energy of degradation ( E a) and glass transition temperature ( T g) of some low molar mass ( M n ≈ 8000 g mol −1) sulfonated poly(arylene ethersulfone)s s-(PAES) s were determined to check their dependence on sulfonation degree ( SD ). The results obtained were compared with those for unsulfonated poly(arylene ethersulfone) PAES. In order to have an accurate control of the chemical structure, a pre-sulfonation route was followed for the preparation of sulfonated compounds. The thermal behaviour of the investigated s-(PAES) s as well as that of PAES appears not to be influenced by the environment (flowing nitrogen or static air atmosphere) of degradation. Both T i and T g values of s-(PAES) s were higher than those of PAES and increased quite linearly as a function of sulfonation degree. An analogous linear trend was observed for the apparent degradation energy of s-(PAES) s, but the values found were largely lower than those of unsulfonated homopolymer. The results are discussed and interpreted.
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