Abstract
Two methods, nanoprecipitation and emulsification/solvent evaporation with different solvents, to prepare nano and microparticles of polylactic acid (PLA) and PHBV are investigated. The obtained particles are characterized in terms of morphology by SEM and thermal properties by DSC and TGA. The objective is the preparation of PLA and PHBV nano and microparticles, with controlled shape and size distribution, for their further inclusion into biopolymer matrices such as PLA, PHBV or thermoplastic starch matrices. The purpose is the use of these biocomposites in the sector of wrapping and packaging. Good thermal properties of the nano and microparticles are important to the posterior processing as extrusion film technique. Although the smallest particles are obtained for PLA using nanoprecipitation technique with THF as solvent, these nanoparticles show a low thermal stability. The emulsification technique using dichloromethane as solvent shows to be a good option to obtain, for PLA and PHBV, spherical particles with controlled size and adequate thermal stability. The reproducibility of the selected method is studied for up-scaling nano and microparticle production to pre-industrial level. This study of reproducibility using statistical analysis shows the robustness of the methodology.
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Acknowledgments
Financial support was provided from Ministerio de Economía y Competitividad (MAT2013-41892-R, Project NanoCompBioPol) and Xunta de Galicia Government (Autonomous Community Government) and FEDER: Program of Consolidation and Structuring Competitive Research Units (GRC 2014/036).
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Bouza, R., del Mar Castro, M., Dopico-García, S. et al. Polylactic acid and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nano and microparticles for packaging bioplastic composites. Polym. Bull. 73, 3485–3502 (2016). https://doi.org/10.1007/s00289-016-1687-2
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DOI: https://doi.org/10.1007/s00289-016-1687-2