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Thermal characterization and thermal degradation of copolyimides containing fluorine and phosphine oxide
Author(s) -
Tang Wanjun,
Chen Donghua,
Yang Zhilan,
Zhang Aiqing,
Peng Yuhua
Publication year - 2005
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.22834
Subject(s) - copolymer , thermogravimetric analysis , differential scanning calorimetry , glass transition , thermal decomposition , materials science , polymer chemistry , phosphine oxide , oxide , decomposition , chemical engineering , fourier transform infrared spectroscopy , chemistry , phosphine , composite material , thermodynamics , polymer , organic chemistry , catalysis , physics , engineering , metallurgy
A series of copolyimides containing different ratios of fluorine and phosphine oxide were synthesized. The copolymers were characterized with Fourier transform infrared, differential scanning calorimetry, and thermogravimetric analysis measurements. The copolymers were thermally stable up to 700 K and exhibited glass‐transition temperatures in the range of 495–562 K. The glass‐transition temperatures of the copolymers decreased with an increase in the phosphine oxide content. The thermal decomposition behavior of the copolymers was investigated. The copolymers with higher phosphine oxide contents displayed lower onset decomposition temperatures and char yields. A new method involving the multiple‐rate isotemperature was used to define the most possible mechanism [ G (α)] for the reactions. The overall kinetic model function of the thermal decomposition of these copolymers obeyed the Avrami–Erofeev model equation, G (α) = [−ln(1 − α)] 1/ m , where α is the conversion degree. The apparent kinetic parameters of the degradation processes were also obtained. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 2139–2143, 2005