Artigo de Periódico
Thermal behavior of nafion membranes
Fecha
1999Registro en:
1388-6150
v. 58
Autor
Almeida, Selma Helena de
Kawano, Yoshio
Almeida, Selma Helena de
Kawano, Yoshio
Institución
Resumen
The thermal behavior of Nafion-117 membranes was investigated by thermogravimetric
analysis (TG) and differential scanning calorimetry (DSC). TG measurements revealed that the
mechanism of thermal degradation of a Nafion membrane in the acid form is different from that
of Nafion in the sodium form. The DSC curves for the first heating, for both acid and salt forms,
display two endothermic peaks, near 120 and 230oC. The high-temperature peak was assigned to
the crystalline domains melting in Nafion, and the low-temperature peak was attributed to a transition
into ionic clusters, since this transition exhibits significant changes depending on the nature
of the counterion and the degree of hydration.