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Mixtures poly((R)-3-hydroxybutyrate) and poly(l-lactic acid) subjected to DSC
Ist Teil von
Journal of thermal analysis and calorimetry, 2011-02, Vol.103 (2), p.653-660
Ort / Verlag
Dordrecht: Springer Netherlands
Erscheinungsjahr
2011
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
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.