Morphology and Properties of Blends of Poly(3-hydroxybutyrate) with Poly(vinyl alcohol)

: pp. 311 – 316
Anatoly Olkhov and Alexey Iordanskii
  1. Plekhanov Russian University of Economics, 36, Stremyanny Ln., 117997 Moscow, Russia
  2. Semenov Institute of Chemical Physics, Russian Academy of Sciences, 4, Kosygin St., 119991 Moscow, Russia

The structure of extruded films based on blends of polyvinyl alcohol and poly(3-hydroxybutyrate) (PHB) was studied for various compositions. The methods of DSC and X-ray analysis were used. As the phase-sensitive characteristics of the composite films, diffusion and water vapor permeability were also investigated. In addition, the tensile modulus and relative elongation-at-break were measured. Changes in the glass transition temperature of the blends and constant melting points of the components show their partial compatibility in intercrystallite regions. At the content of PHB in the composite films equal to 20–30 wt % their mechanical characteristics and water diffusion coefficients are dramatically changed. This fact, along with the analysis of the X-ray diffractograms, indicates a phase inversion in the above narrow concentration interval. The complex pattern of the kinetic curves of water vapor permeability is likely to be related to additional crystallization, which is induced in the composite films in the presence of water

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