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Biodegradable films from PHB‐8HV copolymers and polyalcohols blends: crystallinity, dynamic mechanical analysis and tensile properties
Author(s) -
Cyras V P,
Fernández N Galego,
Vázquez A
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199908)48:8<705::aid-pi205>3.0.co;2-p
Subject(s) - crystallinity , dynamic mechanical analysis , materials science , fourier transform infrared spectroscopy , glass transition , scanning electron microscope , polypropylene , amorphous solid , ultimate tensile strength , morphology (biology) , chemical engineering , polymer , thermal analysis , polymer chemistry , composite material , chemistry , thermal , organic chemistry , physics , biology , meteorology , engineering , genetics
Blends of poly(3‐hydroxybutyrate)‐poly(3‐hydroxyvalerate) (PHB‐HV) and polyalcohols have been prepared by solvent casting. The polyalcohols used were castor oil (CO) and polypropylene glycol (PPG400 and PPG1000). Thermal behaviour, crystallinity, morphology and dynamic mechanical properties of systems with various PPG1000 compositions have been studied. Crystallinity was determined by means of Fourier transform infrared spectroscopy (FTIR) and X‐ray diffraction. Final morphology was studied by means of scanning electron microscopy (SEM). Dynamical mechanical analysis showed two glass transition temperatures for the blends, corresponding to separate phases of PHB‐HV and polyalcohols. Blend immiscibility was found. Polyalcohol addition enhances the crystallinity of PHB‐HV. However, the storage modulus value decreases, upon the addition of amorphous compound. © 1999 Society of Chemical Industry