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Kinetics of thermal degradation of poly( p ‐phenylene benzobisoxazole)
Author(s) -
Lin Heng,
Zhuang Qixin,
Cheng Jianjun,
Liu Zitao,
Han Zhewen
Publication year - 2006
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.25584
Subject(s) - thermogravimetric analysis , activation energy , kinetics , poly(p phenylene) , degradation (telecommunications) , materials science , thermodynamics , polymer chemistry , kinetic energy , thermal stability , chemistry , polymer , physics , composite material , organic chemistry , computer science , telecommunications , quantum mechanics
The kinetics of thermal degradation of poly ( p ‐phenylen benzobisoxazole) (PBO) were studied by thermogravimetric analysis (TG) in dynamic nitrogen gas at four different heating rates: 5, 10, 15, 20°C/min. The activation energy calculated by Kissinger Method was 352.19 kJ/mol, and the mean value of activation energies evaluated by Flynn‐Wall‐Ozawa Method was 338.32 kJ/mol. The degradation kinetic model of PBO followed the mechanism of random scission of weak bonds of PBO molecule and impact of the active groups obtained from the broken bonds, Mampel Power equation with integral form G (α) = α 3/2 and differential form $ f(\alpha)={2\over 3}\alpha^{-1/2} $ . And the mathematical equation of kinetic compensation effect was ln A = 0.1365 E a − 1.4102. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 3675–3679, 2007