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Thermogravimetric study of thermal degradation of polyetherimide
Author(s) -
Zaragoza Sonia,
Álvarez Ana,
Álvarez Begoña,
LópezBeceiro Jorge,
Naya Salvador,
Forcén Patricia,
Artiaga Ramón
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.42329
Subject(s) - polyetherimide , isothermal process , thermogravimetry , activation energy , materials science , thermogravimetric analysis , thermodynamics , context (archaeology) , degradation (telecommunications) , thermal stability , thermal , thermal analysis , kinetic energy , process (computing) , order of reaction , kinetics , composite material , chemical engineering , chemistry , reaction rate constant , physics , polymer , computer science , organic chemistry , engineering , biology , operating system , paleontology , telecommunications , quantum mechanics
Thermal stability in nonoxidizing atmosphere of a polyetherimide (PEI) is investigated by thermogravimetry (TG). It is observed that thermal degradation of this product consists of two overlapping processes, which are conveniently separated by fitting the TG curves to mixtures of generalized logistic functions. Thus, each process is represented by a single function. The analysis of the fitting parameter values obtained for the main degradation process in different isothermal and heating ramp conditions allows to obtain insightful kinetic parameters (critical temperature, energy barrier, and reaction‐order) which allow to make predictions in both isothermal and nonisothermal contexts. There is a minimum temperature for each process to occur and a ramp‐energy barrier related to the process rate. In the ramp context, the values of these two parameters explain that, although one process starts at lower temperature, it proceeds at a very low rate until reaching temperatures at which the other process goes much faster. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 42329.