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Properties of a Biodegradable Ternary Blend of Thermoplastic Starch (TPS), Poly(ε-Caprolactone) (PCL) and Poly(Lactic Acid) (PLA)

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Abstract

Biodegradable ternary blends of thermoplastic starch (TPS), poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) were prepared by one-step extrusion based on the complementary mechanical properties between both ductile PCL and rigid PLA and also low cost TPS. TPS/PCL/PLA blend was prepared using equal mass fraction of each component and presented as an incompatible material. We then evaluated the addition of citric acid, maleic anhydride and methylene diphenyl diisocyanate (MDI) as compatibilizing agents in the ternary blend. They did not significantly affect thermal stabilities of the ternary blends but induced PCL and PLA crystallization. Adding 2 wt% of MDI caused an increase in melt viscosity of the ternary blend suggesting that urethane linkages were formed with TPS and it also was efficient in order to obtain notable improvements in tensile strength and ductility of the ternary blend.

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Acknowledgments

The authors are grateful for the financial support of the projects Granted by FAPESP (2008/08264-9), Capes, CNPq, FINEP, and Embrapa.

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Authors and Affiliations

  1. National Laboratory of Nanotechnology for Agribusiness (LNNA), Embrapa Instrumentation, Rua XV de Novembro, 1452, PO Box 741, São Carlos, SP, CEP 13560-970, Brazil

    Vitor Brait Carmona, Ana Carolina Corrêa, José Manoel Marconcini & Luis Henrique Capparelli Mattoso

  2. Graduate Program in Materials Science and Engineering (PPG-CEM), Federal University of São Carlos (UFSCar), São Carlos, SP, Brazil

    Vitor Brait Carmona

Authors
  1. Vitor Brait Carmona
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  2. Ana Carolina Corrêa
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  3. José Manoel Marconcini
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  4. Luis Henrique Capparelli Mattoso
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Correspondence to Vitor Brait Carmona.

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Carmona, V.B., Corrêa, A.C., Marconcini, J.M. et al. Properties of a Biodegradable Ternary Blend of Thermoplastic Starch (TPS), Poly(ε-Caprolactone) (PCL) and Poly(Lactic Acid) (PLA). J Polym Environ 23, 83–89 (2015). https://doi.org/10.1007/s10924-014-0666-7

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  • DOI: https://doi.org/10.1007/s10924-014-0666-7

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