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Chemical compatibility of lactic acid-grafted starch nanocrystals (SNCs) with polylactic acid (PLA)

  • Somayeh Sharafi Zamir
  • Mohammad Reza Frouzanmehr
  • Malladi Nagalakshmaiah
  • Abdellah Ajji
  • Mathieu Robert
  • Said Elkoun
Original Paper
  • 1 Downloads

Abstract

In this work, starch nanocrystals were chemically grafted with lactic acid using esterification reaction and its compatibility with poly (lactic acid) (PLA). Initially, ungrafted and grafted starch nanocrystals were characterized to understand the crystalline, functional, thermal and morphological properties by means of wide-angle X-ray scattering, Fourier transform infrared, X-ray photoelectron spectroscopy, thermogravimetric analysis and transmission electron microscopy, respectively. The results confirmed that the surface of starch nanocrystals was successfully modified with lactic acid. Subsequently, grafted starch nanocrystals were blended, in solution, with PLA at different concentrations ranging from 5 to 30 wt%. Then, starch nanocrystals/PLA films were prepared using solvent casting technique. The influence of the grafted starch nanocrystals, at different concentrations, on thermal, mechanical and morphological properties of resulting PLA nanocomposites was investigated using differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical analysis and scanning electron microscopy, respectively. The results revealed that the interfacial adhesion and the compatibility between starch nanocrystals and PLA matrix were substantially improved by the grafting. This improved compatibility between grafted starch nanocrystals and PLA led to a significant increase in PLA nanocomposites crystallinity as compared to neat PLA.

Keywords

Starch nanocrystals Chemical grafting Interfacial adhesion PLA nanocomposites Crystallinity 

Notes

Acknowledgements

The authors would like to thank National Science and Engineering Research Council (NSERC) of Canada, Centre Québecois des Matériaux Fonctionnels (CQMF) and Research Center for High Performance Polymer and Composite Systems (CREPEC) of Fonds de Recherche du Québec Nature et Technologie (FRQNT) for financial support.

Compliance with ethical standards

Conflict of interest

The authors declare no conflict of interest regarding publication of this manuscript.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Somayeh Sharafi Zamir
    • 1
    • 2
  • Mohammad Reza Frouzanmehr
    • 2
  • Malladi Nagalakshmaiah
    • 2
  • Abdellah Ajji
    • 3
  • Mathieu Robert
    • 2
  • Said Elkoun
    • 2
  1. 1.Department of Chemical and Biotechnological EngineeringUniversity of SherbrookeSherbrookeCanada
  2. 2.Center for Innovation in Technological and Ecodesign (CITE)University of SherbrookeGranbyCanada
  3. 3.3SPack, CREPEC, Chemical Engineering DepartmentPolytechnique MontrealMontrealCanada

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