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Hydrolytic Degradation of Poly(3-hydroxybutyrate), Polylactide and their Derivatives: Kinetics, Crystallinity, and Surface Morphology

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Hydrolytic degradations of biodegradable poly(3-hydroxybutyrate) (PHB), polylactide (PLA) and their derivatives were explored by kinetic and structure methods at 37 and 70°C in phosphate buffer. It was revealed the kinetic profiles for copolymer PHBV (20% of 3-hydroxyvalerate) and the blend PHB-PLA (1:1 wt. ratio). The intensity of biopolymer hydrolysis depending on temperature is characterized by total weight loss and the viscosity-averaged molecular weight decrement (ΔMW) as well as by WAXS and AMF techniques. Characterization of PHB and PHBV includes both ΔMW and crystallinity evolution (x-ray diffraction) as well as the AFM analysis of PHB film surfaces before and after aggressive medium exposition. The degradation is enhanced in the series PHBV < PHB < PHB-PLA blend < PLA. The impact of MW on the biopolymer hydrolysis is shown.
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Keywords: AMF; PHB-PLA blend non-enzymatic hydrolysis; WAXS; bacterial poly(3-hydroxybutyrate); copolymer PHBV; crystallinity; polylactide; role of molecular weight; total weight loss

Document Type: Research Article

Affiliations: 1: A. N. Bach's Institute of Biochemistry,Russian Academy of Sciences, Leninskiy prosp. 33119071,Moscow, Russia 2: A. V. Topchiev Institute of Petroleum Chemistry, Leninskiy prosp. 27119071,Moscow, Russia 3: General Institute of Chemical Physics,Russian Academy of Sciences, Kosygin str. 4119991,Moscow, Russia

Publication date: May 3, 2012

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