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Synergistic effect of lactic acid oligomers and laminar graphene sheets on the barrier properties of polylactide nanocomposites obtained by the in situ polymerization pre‐incorporation method
Author(s) -
AmbrosioMartín Jesús,
LópezRubio Amparo,
José Fabra María,
Angel LópezManchado Miguel,
Sorrentino Andrea,
Gorrasi Giuliana,
Lagarón Jose M.
Publication year - 2016
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.42661
Subject(s) - materials science , nanocomposite , oxygen permeability , in situ polymerization , compounding , condensation polymer , graphene , polymerization , dispersion (optics) , chemical engineering , composite material , in situ , lactic acid , polymer , polymer chemistry , oxygen , chemistry , organic chemistry , nanotechnology , engineering , biology , bacteria , genetics , physics , optics
Nanocomposites of polylactide (PLA) and functionalized graphene sheets (FGS) were obtained via melt compounding. Pre‐incorporation of the FGS fillers into lactic acid oligomers (OLLA) by in situ melt polycondensation was performed with the aim of improving the FGS dispersion and distribution into the polymeric matrix. To evaluate the effect of the pre‐incorporation step, a comparison with direct addition of the filler to the melt mixing process was carried out. Addition of OLLA and FGS led to enhanced better barrier properties. Specifically, reductions of up to 45% and 41% in oxygen and water vapor permeability were achieved, respectively. Mechanical and electrical properties of the PLA and its nanocomposites were also studied and correlated with both the addition of oligomers and the incorporation method. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 42661.