Abstract:
:The detection of phase separation and identification of miscibility in biopolymer blends is an important aspect for the improvement of their physical properties. In this article, the phase separation in blends of poly(3-hydroxybutyrate) (PHB) with poly(L-lactic acid) (PLA) and poly(epsilon-caprolactone) (PCL), respectively, has been studied as a function of the blend composition by FT-IR imaging spectroscopy. For both polymer blend systems, a miscibility gap has been found around the 50:50% (w/w) composition of the two components. Furthermore, the separating phases have been identified as blends of the two polymer components and their compositions could be determined from calibrations based on the spectra of the blends in the compositional range of miscibility. The data derived from FT-IR spectroscopic imaging were corroborated by additional DSC analyses and mechanical stress-strain measurements of polymer blend films, which exhibited a characteristic fracture behavior as a function of PHB composition.
journal_name
Biomacromoleculesjournal_title
Biomacromoleculesauthors
Vogel C,Wessel E,Siesler HWdoi
10.1021/bm701035psubject
Has Abstractpub_date
2008-02-01 00:00:00pages
523-7issue
2eissn
1525-7797issn
1526-4602journal_volume
9pub_type
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