The isothermal degradation of three aromatic polyetherketones was studied in an inert environment at various temperatures in the range 683-803 K. In the first degradation stage (mass loss D20%) a linear increase of D as a function of heating time (t) was observed and the corresponding kinetic D=Do+t equations at various temperatures were directly drawn by smoothing the experimental TG data. The values, which represent the mass loss rates during degradation, increased as a function of temperature according to Arrhenius-type equations, from which degradation Ea values were determined, which appear in agreement with those from literature methods. Some differences observed were discussed and interpreted.
|Titolo:||Determination of Degradation Apparent Activation Energy Values of Polymers Regression of kinetic parameters derived from TG Data|
|Data di pubblicazione:||2002|
|Appare nelle tipologie:||1.1 Articolo in rivista|