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Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications

A green, effective methodology for the preparation of water-based dispersions of poly(lactic acid) (PLA) for coating purposes is herein presented. The procedure consists of two steps: in the first one, an oil-in-water emulsion is obtained by mixing a solution of PLA in ethyl acetate with a water pha...

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Autores principales: Belletti, Giada, Buoso, Sara, Ricci, Lucia, Guillem-Ortiz, Alejandro, Aragón-Gutiérrez, Alejandro, Bortolini, Olga, Bertoldo, Monica
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8400580/
https://www.ncbi.nlm.nih.gov/pubmed/34451306
http://dx.doi.org/10.3390/polym13162767
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author Belletti, Giada
Buoso, Sara
Ricci, Lucia
Guillem-Ortiz, Alejandro
Aragón-Gutiérrez, Alejandro
Bortolini, Olga
Bertoldo, Monica
author_facet Belletti, Giada
Buoso, Sara
Ricci, Lucia
Guillem-Ortiz, Alejandro
Aragón-Gutiérrez, Alejandro
Bortolini, Olga
Bertoldo, Monica
author_sort Belletti, Giada
collection PubMed
description A green, effective methodology for the preparation of water-based dispersions of poly(lactic acid) (PLA) for coating purposes is herein presented. The procedure consists of two steps: in the first one, an oil-in-water emulsion is obtained by mixing a solution of PLA in ethyl acetate with a water phase containing surfactant and stabilizer. Different homogenization methods as well as oil/water phase ratio, surfactant and stabilizer combinations were screened. In the second step, the quantitative evaporation of the organic provides water dispersions of PLA that are stable, at least, over several weeks at room temperature or at 4 °C. Particle size was in the 200–500 nm range, depending on the preparation conditions, as confirmed by scanning electron microscope (SEM) analysis. PLA was found not to suffer significant molecular weight degradation by gel permeation chromatography (GPC) analysis. Furthermore, two selected formulations with glass transition temperature (Tg) of 51 °C and 34 °C were tested for the preparation of PLA films by drying in PTFE capsules. In both cases, continuous films that are homogeneous by Fourier-transform infrared spectroscopy (FT-IR) and SEM observation were obtained only when drying was performed above 60 °C. The formulation with lower Tg results in films which are more flexible and transparent.
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spelling pubmed-84005802021-08-29 Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications Belletti, Giada Buoso, Sara Ricci, Lucia Guillem-Ortiz, Alejandro Aragón-Gutiérrez, Alejandro Bortolini, Olga Bertoldo, Monica Polymers (Basel) Article A green, effective methodology for the preparation of water-based dispersions of poly(lactic acid) (PLA) for coating purposes is herein presented. The procedure consists of two steps: in the first one, an oil-in-water emulsion is obtained by mixing a solution of PLA in ethyl acetate with a water phase containing surfactant and stabilizer. Different homogenization methods as well as oil/water phase ratio, surfactant and stabilizer combinations were screened. In the second step, the quantitative evaporation of the organic provides water dispersions of PLA that are stable, at least, over several weeks at room temperature or at 4 °C. Particle size was in the 200–500 nm range, depending on the preparation conditions, as confirmed by scanning electron microscope (SEM) analysis. PLA was found not to suffer significant molecular weight degradation by gel permeation chromatography (GPC) analysis. Furthermore, two selected formulations with glass transition temperature (Tg) of 51 °C and 34 °C were tested for the preparation of PLA films by drying in PTFE capsules. In both cases, continuous films that are homogeneous by Fourier-transform infrared spectroscopy (FT-IR) and SEM observation were obtained only when drying was performed above 60 °C. The formulation with lower Tg results in films which are more flexible and transparent. MDPI 2021-08-18 /pmc/articles/PMC8400580/ /pubmed/34451306 http://dx.doi.org/10.3390/polym13162767 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Belletti, Giada
Buoso, Sara
Ricci, Lucia
Guillem-Ortiz, Alejandro
Aragón-Gutiérrez, Alejandro
Bortolini, Olga
Bertoldo, Monica
Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications
title Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications
title_full Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications
title_fullStr Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications
title_full_unstemmed Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications
title_short Preparations of Poly(lactic acid) Dispersions in Water for Coating Applications
title_sort preparations of poly(lactic acid) dispersions in water for coating applications
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8400580/
https://www.ncbi.nlm.nih.gov/pubmed/34451306
http://dx.doi.org/10.3390/polym13162767
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