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The nonisothermal degradation kinetics of the copolymer poly{N-[(4-bromo-3,5-difluorine)phenyl]maleimide- co -styrene}, which was synthesized with N-[(4-bromo-3,5-difluorine)phenyl]maleimide and styrene, were studied by thermogravimetry/derivative thermogravimetry techniques. The kinetic parameters, including the activation energy and the pre-exponential factor of the copolymer degradation process, were calculated by the Kissinger and Flynn-Wall-Ozawa methods. The thermal degradation mechanism of the copolymer was also studied with the Satava-Sestak method. The results show that the activation energies were 165.97 kJ/mol with the Kissinger method and 169.04 kJ/mol with the Flynn-Wall-Ozawa method. The degradation of the copolymer followed a kinetic model of a nucleation and growth and the kinetic equation could be expressed as  G ( α ) =  [-ln(1-  α )] 1/2  [where  G ( α ) is the integral function of conversion and  α  is the extent of conversion of the reactant decomposed at time  t ]. The reaction order was 1/2.

Thermal degradation kinetics of poly {N-[(4-bromo- 3,5-difluorine)-phenyl]maleimide-co-styrene} in nitrogen