Abstract
Poly(3-hydroxybutyrate), PHB, has been struc- turally modified through reaction with hydroxy acids (HA) such as tartaric acid (TA) and malic acid (MA). The crys- tallization kinetic of the samples was evaluated by isocon- versional method through nonlinear fitting to obtain the estimation for activation energy (Ea) and pre-exponential (A) values. The thermal behavior of the crystallization temperature, 44.8 and 58.9 Ca t 5C/min, and results obtained to the average activation energy, 73 ± 9 kJ mol -1 and 63 ± 1 kJ mol -1 , to PHB/MA and PHB, respectively, are suggesting that malic acid may be deriving plasticizer units from its own PHB chain. PHB/TA show increase in the medium value of Ea, 119 ± 2 kJ mol -1 and Tc = 48.2 C (at 5 C/min), indicating that tartaric acid is probably interacts in different way to the of PHB chain (Ea=73 ± 9 kJ mol -1 , Tc = 44.8 Ca t 5C/min).
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