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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PHB-PLA blend non-enzymatic hydrolysis;
role of molecular weight;
total weight loss
Document Type: Research Article
A. N. Bach's Institute of Biochemistry,Russian Academy of Sciences, Leninskiy prosp. 33119071,Moscow, Russia
A. V. Topchiev Institute of Petroleum Chemistry, Leninskiy prosp. 27119071,Moscow, Russia
General Institute of Chemical Physics,Russian Academy of Sciences, Kosygin str. 4119991,Moscow, Russia
May 3, 2012