Mechanical, Morphological and Thermal Characterization of Compatibilized  Poly(lactic acid)/Thermoplastic Starch Blends

László Lendvai; Dávid Brenn

doi:10.14513/actatechjaur.v13.n1.532

Authors

László Lendvai Széchenyi István University, Department of Materials Science and Engineering, Egyetem tér 1, H-9026 Győr, Hungary / Budapest University of Technology and Economics, Department of Polymer Engineering, Műegyetem rkp. 3, H-1111 Budapest, Hungary http://orcid.org/0000-0003-3670-327X
Dávid Brenn Budapest University of Technology and Economics, Department of Polymer Engineering, Műegyetem rkp. 3, H-1111 Budapest, Hungary

DOI:

https://doi.org/10.14513/actatechjaur.v13.n1.532

Keywords:

thermoplastic starch, poly(lactic acid), compatibilization, polymer blend

Abstract

A two-step compounding procedure was used to produce binary blends composed of poly(lactic acid) (PLA) and thermoplastic starch (TPS) with varying component ratios. Subsequently, three different chemical connectors were introduced in order to enhance the interfacial adhesion between the PLA and the TPS. Maleic anhydride, blocked isocyanate, and chain extender were used as coupling agents. Mechanical, morphological and thermal properties of PLA/TPS blends were determined. It was revealed that the initial interfacial adhesion between the components is weak. Out of the three coupling agents introduced, the chain extender proved to be the most effective, however, the improvement achieved in the mechanical properties was still marginal. According to the thermogravimetric analysis thermal stability was not significantly affected by any of the coupling agents.

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