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Mixtures poly((R)-3-hydroxybutyrate) and poly(l-lactic acid) subjected to DSC

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Abstract

Blends of bacterial poly((R)-3-hydroxybutyrate) (PHB) and poly(l-lactic acid) (PLLA) synthesized by polycondensation of l-lactic acid or by ring-opening polymerization of l-lactide were studied. Miscibility was investigated through both conventional differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC). PHB and low-molar mass PLLA were miscible in a whole concentration range, and a single glass transition temperature was observed. On the other hand, PHB/high-molar mass PLLA mixtures phase separate, giving rise to two glass transition temperatures corresponding to PHB and PLLA. A treatment of blends at 190 °C leads to formation of block/multiblock/random copolymers, and blends become miscible.

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Acknowledgements

This research was supported by Czech Science Foundation (grant no. 106/09/1378) and the research program MSM 6046137302.

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  1. Department of Polymers, Institute of Chemical Technology, Prague, Technická 5, 166 28, Prague 6, Czech Republic

    Lenka Malinová & Jiří Brožek

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  1. Lenka Malinová
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  2. Jiří Brožek
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Correspondence to Jiří Brožek.

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Malinová, L., Brožek, J. Mixtures poly((R)-3-hydroxybutyrate) and poly(l-lactic acid) subjected to DSC. J Therm Anal Calorim 103, 653–660 (2011). https://doi.org/10.1007/s10973-010-1092-2

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  • DOI: https://doi.org/10.1007/s10973-010-1092-2

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