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Environmental Degradation of Blends of Atactic Poly[(R,S)-3-hydroxybutyrate] with Natural PHBV in Baltic Sea Water and Compost with Activated Sludge

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Abstract

Degradation of atactic poly[(R,S)-3-hydroxybutyrate] (a-PHB) binary blends with natural poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV, 12 mol% of 3HV units), has been investigated and compared with plain PHBV in the compost containing activated sludge and under marine exposure conditions in the dynamic water of the Baltic Sea. Characteristic parameters of compost and the Baltic Sea water were monitored during the incubation period (6 weeks) and their influence on the degree of biodegradation is discussed. After specified degradation times of the experiments the weight loss of the samples, surface changes, changes in molecular weight and polydispersity as well as changes of the composition and thermo-mechanical properties of the blends have been evaluated. Macroscopic observations of the samples were accompanied by investigations using optical microscopy, size-exclusion chromatography (SEC), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and tensile testing. The degree of degradation of blends of a-PHB with PHBV depends on the blend composition and environmental conditions. In both environments studied the weight loss of plain PHBV was more significant than changes the molecular weight. In both environments only enzymatic degradation of the blends, which proceeds via surface erosion mechanisms, was observed during the incubation period.

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Acknowledgments

This work was partially supported by the European Community’s Fifth Framework Programme under Wheypol project G5RD-CT-2001-00591 and by a Marie Curie Transfer of Knowledge Fellowship of the European Community’s Sixth Framework Programme under the contract number MTKD-CT-2004-509232.

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Authors and Affiliations

  1. Department of Chemistry, Gdynia Maritime University, Gdynia, Poland

    Maria Rutkowska, Katarzyna Krasowska & Aleksandra Heimowska

  2. Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland

    Grażyna Adamus, Michał Sobota, Marta Musioł, Henryk Janeczek, Wanda Sikorska & Marek Kowalczuk

  3. Laboratory for Polymer Chemistry and Technology, National Institute of Chemistry, Ljubljana, Slovenia

    Andrej Krzan & Ema Žagar

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  1. Maria Rutkowska
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  2. Katarzyna Krasowska
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  3. Aleksandra Heimowska
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  4. Grażyna Adamus
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  11. Marek Kowalczuk
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Correspondence to Marek Kowalczuk.

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Rutkowska, M., Krasowska, K., Heimowska, A. et al. Environmental Degradation of Blends of Atactic Poly[(R,S)-3-hydroxybutyrate] with Natural PHBV in Baltic Sea Water and Compost with Activated Sludge. J Polym Environ 16, 183–191 (2008). https://doi.org/10.1007/s10924-008-0100-0

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