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Compatibilization of poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate)–poly(lactic acid) blends with diisocyanates
Author(s) -
GonzálezAusejo Jennifer,
SánchezSafont Estefania,
Lagarón José Maria,
Balart Rafael,
Cabedo Luis,
GámezPérez José
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.44806
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , materials science , crystallinity , compatibilization , rheometry , hexamethylene diisocyanate , dynamic mechanical analysis , thermal stability , lactic acid , polymer chemistry , composite material , polymer blend , chemical engineering , rheology , polymer , copolymer , polyurethane , physics , genetics , biology , bacteria , engineering , thermodynamics
Poly(3‐hydroxybutyrate‐ co ‐3‐hydroxyvalerate) (PHBV) was blended with poly(lactic acid) (PLA) with various reactive processing agents to decrease its brittleness and enhance its processability. Three diisocyanates, namely, hexamethylene diisocyanate, poly(hexamethylene diisocyanate), and 1,4‐phenylene diisocyanate, were used as compatibilizing agents. The morphology, thermomechanical properties, and rheological behavior were investigated with scanning electron microscopy, thermogravimetric analysis, differential scanning calorimetry, tensile testing, dynamomechanical thermal analysis in torsion mode (dynamic mechanical analysis), and oscillatory rheometry with a parallel‐plate setup. The presence of the diisocyanates resulted in an enhanced polymer blend compatibility; this led to an improvement in the overall mechanical performance but did not affect the thermal stability of the system. A slight reduction in the PHBV crystallinity was observed with the incorporation of the diisocyanates. The addition of diisocyanates to the PHBV–PLA blend resulted in a notable increase in the final complex viscosity at low frequencies when compared with the same system without compatibilizers. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 44806.