Degradation of Poly(3-hydroxybutyrate) and its Derivatives: Characterization and Kinetic Behavior

Автори: 
Anton Bonartsev, Arasha Boskhomdzhiev, Vera Voinova, Taniana Makhina, Vera Myshkina, Sergey Yakovlev, Irina Zharkova, Elena Filatova, Anton Zernov, Dmitry Bagrov, Natalia Andreeva, Alexander Rebrov, Garina Bonartseva and Alexey Iordan

We focused on hydrolytic degradation kinetics at 310 and 343 K in phosphate buffer to compare PLA and PHB kinetic profiles. Besides, we revealed the kinetic behavior for copolymer PHBV (20 % of 3-hydroxyvalerate) and the blend PHB-PLA (1:1). The intensity of biopolymer hydrolysis is characterized by total weight lost and the viscosity-averaged molecular weight (MW) decrement. The degradation is enhanced in the series PHBV < PHB < PHB-PLA blend < PLA. Characterization of PHB and PHBV includes MW and crystallinity evolution (X-ray diffraction) as well as AFM analysis of PHB film surfaces before and after aggressive medium exposition. The important impact of MW on the biopolymer hydrolysis is shown.

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