Abstract
This study reports the use of solid state ball milling (SSBM) for dispersing cellulose nanowhiskers (CNWs) in starch-based thermoplastics. Prior to conventional drying, interwhiskers agglomeration was minimized by coating the CNWs with pectin, a vegetable hydrocolloid polysaccharide. SSBM and melt-processing were employed to prepare the nanocomposites. A strong correlation between mechanical reinforcement and nanowhisker dispersion was proven by results of tensile tests, scanning electron microscopy and dynamical mechanical thermal analysis. The starch–pectin–CNW nanocomposites showed high dispersion of the nano-sized filler in the matrix, thus SSBM shows great potential when compared to sol–gel, casting/evaporation and other methods to disperse these promising nanoparticles.
Abbreviations
- CNW:
-
Cellulose nanowhisker
- SSBM:
-
Solid state ball milling
- TPS:
-
Thermoplastic starch
- DMTA:
-
Dynamic mechanical thermal analysis
- STEM:
-
Scanning transmission electron microscopy
- FESEM:
-
Field emission scanning electron microscopy
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Acknowledgments
The authors are grateful to Embrapa, FINEP/MCT, CNPq, CAPES and FAPESP for the financial support. The authors are also gratefully acknowledged to Mr. Renê de Oste from CNPDIA for his helpful assistance with the ball milling apparatus. This research is a part of the Rede de Nanotecnologia Aplicada ao Agronegócio (Rede Agronano), Brazil.
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Moreira, F.K.V., Marconcini, J.M. & Mattoso, L.H.C. Solid state ball milling as a green strategy to improve the dispersion of cellulose nanowhiskers in starch-based thermoplastic matrices. Cellulose 19, 2049–2056 (2012). https://doi.org/10.1007/s10570-012-9768-3
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DOI: https://doi.org/10.1007/s10570-012-9768-3