Abstract
The thermal degradation of miscible and immiscible poly (3-hidroxy butyrate) PHB/ poly (ethylene terephthalate) sulphonated (PETs) blends was investigated using thermogravimetric analyses. Model-free kinetic analysis, Vyazovkin and Flynn-Wall-Ozawa's methods, were used to determine the apparent activation energy in the whole interval of degradation of the pure polymers, immiscible blends, and miscible blends. The thermal stability of both polymers in their blends is higher when compared to the pure polymers. The synergistic effect in the thermal stability in the blends is higher for the miscible blend where the formation of the specific interaction between PHB and PETs occurs. The apparent activation energy of the individual polymers is higher in PETs/PHB blends, and this effect is potentiated by the miscibility of the blend.
Highlights
Flynn-Wall-Ozawa’s methods, were used to determine the apparent activation energy in the whole interval of degradation of the pure polymers, immiscible blends, and miscible blends
The present study demonstrated that the two different methods, Vyazovkin and Flynn-Wall-Ozawa, provided close values of Ea
The model-free kinetic analysis is an outstanding alternative for estimating the apparent activation energy for the thermal degradation of polymeric blends, and these methods making possible the individual analysis of polymers in the blends
Summary
In the present work is reported the study of the thermal applications due their limited thermal and mechanical degradation behavior of pure PHB, pure PETs and of properties. PHB, a polyhidroxyalkanoate, presents good barrier process extent; this characteristic allowed the individual properties, biocompatibility, biodegradability, and sensorial study of polymers behavior in the blends. The knowledge of the thermal stability and of the miscible (blend 2) blends, in weight fractions, are kinetic parameters of the thermal degradation process of 0.35/0.65 and 0.81/0.19, respectively, in relationship of polymers and their blends is important in the processing PETs for PHB. The obtaining and characterization process and application of the same ones[14, 15] The determination of these blends were reported previously by our group[13]. R. et al – Miscibility influence in the thermal stability and kinetic parameters of Poly (3-hydroxybutyrate)/ Poly (ethylene terephthalate) sulphonated blends
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