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Synthesis and Characterization of Lactic Acid Oligomers: Evaluation of Performance as Poly(Lactic Acid) Plasticizers

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Abstract

The use of fully bio-based and biodegradable materials for massive applications, such as food packaging, is an emerging tendency in polymer research. But the formulations proposed in this way should preserve or even increase the functional properties of conventional polymers, such as transparency, homogeneity, mechanical properties and low migration of their components to foodstuff. This is not always trivial, in particular when brittle biopolymers, such as poly(lactic acid) (PLA), are considered. In this work the formulation of innovative materials based on PLA modified with highly compatible plasticizers, i.e. oligomers of lactic acid (OLAs) is proposed. Three different synthesis conditions for OLAs were tested and the resulting additives were further blended with commercial PLA obtaining transparent and ductile materials, able for films manufacturing. These materials were tested in their structural, thermal and tensile properties and the best formulation among the three materials was selected. OLA with molar mass (Mn) around 1,000 Da is proposed as an innovative and fully compatible and biodegradable plasticizer for PLA, able to replace conventional plasticizers (phthalates, adipates or citrates) currently used for films manufacturing in food packaging applications.

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Acknowledgments

Authors would like to thank PURAC BV (Gorinchem, The Netherlands) for kindly supplying d,l-LA. It is also acknowledged the financial support obtained from the Spanish Ministry of Economy and Competitiveness (Ref. MAT-2011-28468-C02-01) and CDTI (Ref. IDI-20110558).

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Authors and Affiliations

  1. Analytical Chemistry, Nutrition and Food Sciences Department, University of Alicante, PO Box 99, 03080, Alicante, Spain

    Nuria Burgos & Alfonso Jiménez

  2. R&D Department, Condensia Química S.A, C/La Cierva 8, 08184, Palau de Plegamans, Barcelona, Spain

    Daniel Tolaguera & Stefano Fiori

Authors
  1. Nuria Burgos
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  2. Daniel Tolaguera
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  3. Stefano Fiori
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  4. Alfonso Jiménez
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Corresponding author

Correspondence to Alfonso Jiménez.

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Burgos, N., Tolaguera, D., Fiori, S. et al. Synthesis and Characterization of Lactic Acid Oligomers: Evaluation of Performance as Poly(Lactic Acid) Plasticizers. J Polym Environ 22, 227–235 (2014). https://doi.org/10.1007/s10924-013-0628-5

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  • DOI: https://doi.org/10.1007/s10924-013-0628-5

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