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Preparation and Properties of Poly(lactic Acid)/Thermoplastic Starch/Reduced Graphene Oxide Composites
Author(s) -
Ferreira Willian H.,
Andrade Cristina T.
Publication year - 2018
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201800113
Subject(s) - materials science , crystallinity , composite material , thermogravimetric analysis , differential scanning calorimetry , graphene , polylactic acid , thermoplastic , scanning electron microscope , oxide , nucleation , ultimate tensile strength , dynamic mechanical analysis , chemical engineering , polymer , chemistry , organic chemistry , metallurgy , nanotechnology , physics , engineering , thermodynamics
Glucose‐reduced graphene oxide (rGO‐g) is incorporated in thermoplastic starch (TPS)/polylactic acid (PLA) 1:1 immiscible blend by one‐step extrusion. X‐ray diffraction shows increased crystallinity for TPS/PLA/rGO‐g composites and intercalation of rGO‐g lamellae. Differential scanning calorimetry indicated that the rGO‐g filler induced crystal nucleation in the composites. Scanning electron microscopy images obtained for the composites presented improved adhesion between the phases. Thermogravimetric analysis results showed improvement in the maximum degradation rate ( T max ) for TPS and for PLA phases in the composites. Tensile tests revealed increase of rigidity of the composites in relation to the neat blend, reaching 10‐fold increase of the Young's modulus for the composition with rGO‐g incorporated at 5.0% mass content. The presence of rGO‐g intercalated lamellae resulted in a small volume of conductive pathways, which led to conductivity values around σ = 10 −8 and 10 −7 S cm −1 for the composition with rGO‐g incorporated at 3.0 and 5.0% mass content, respectively.