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Michalak, Michał; Kwiecień, Michał; Kawalec, Michał; Kurcok, Piotr
RSC advances, 01/2016, Letnik: 6, Številka: 16Journal Article
The thermal stability of poly(3-hydroxybutyrate) (PHB) in an oxidation environment was investigated in bulk at temperatures ranging from 100 °C to 140 °C. The process carried out in pure oxygen resulted in PHB backbone degradation with resulting non-volatile products typical for regular PHB thermal degradation while thermal treatment of PHB in an oxygen/ozone mixture resulted in increased rate of polymer backbone scission. The non-volatile degradation product contained macromolecules with several types of terminal groups but also a part of the 3-hydroxybutyrate repeating units was transformed into 3-malic acid units. NMR and multi-stage MS characterization revealed the random distribution of 3-malic acid units in the oligomeric products as well as the content of the malic acid units being dependent on oxidation conditions.
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