Mixtures poly((<Emphasis Type="Italic">R</Emphasis>)-3-hydroxybutyrate) and poly(<Emphasis Type="SmallCaps">l</Emphasis>-lactic acid) subjected to DSC |
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Authors: | Lenka Malinová Ji?í Bro?ek |
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Institution: | 1.Department of Polymers,Institute of Chemical Technology, Prague,Prague 6,Czech Republic |
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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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Keywords: | |
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