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Kinetic model of poly(3-hydroxybutyrate) thermal degradation from experimental non-isothermal data
Authors:A. F. Santos  L. Polese  M. S. Crespi  C. A. Ribeiro
Affiliation:1.Department of Analytical Chemistry, Chemistry Institute,Universidade Estadual Paulista,Araraquara, S?o Paulo,Brazil
Abstract:The non-isothermal data given by TG curves for poly(3-hydroxybutyrate) (PHB) were studied in order to obtain a consistent kinetic model that better represents the PHB thermal decomposition. Thus, data obtained from the dynamic TG curves were suitably managed in order to obtain the Arrhenius kinetic parameter E according to the isoconversional F-W-O method. Once the E parameters is found, a suitable logA and kinetic model (f(α)) could be calculated. Hence, the kinetic triplet (E±SD, logA±SD and f(α)) obtained for the thermal decomposition of PHB under non-isothermal conditions was E=152±4 kJ mol−1, logA=14.1±0.2 s−1 for the kinetic model, and the autocatalytic model function was: f(α)=αm(1−α)n0.42(1−α)0.56.
Keywords:biodegradable polymers  non-isothermal kinetic  PHB thermal degradation
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