Thermoplastic starch/polyvinyl alcohol blends modification by citric acid–glycerol polyesters

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Título: Thermoplastic starch/polyvinyl alcohol blends modification by citric acid–glycerol polyesters
Autor/es: Castro, Jennifer M. | Montalbán, Mercedes G. | Martínez-Pérez, Noelia | Domene-López, Daniel | Pérez, Juana M. | Arrabal-Campos, Francisco M. | Fernández, Ignacio | Martin-Gullon, Ignacio | García Quesada, Juan Carlos
Grupo/s de investigación o GITE: Residuos, Energía, Medio Ambiente y Nanotecnología (REMAN)
Centro, Departamento o Servicio: Universidad de Alicante. Departamento de Ingeniería Química | Universidad de Alicante. Instituto Universitario de Ingeniería de los Procesos Químicos
Palabras clave: Thermoplastic starch/polyvinyl alcohol | Citric acid | Plasticizer
Fecha de publicación: 17-jun-2023
Editor: Elsevier
Cita bibliográfica: International Journal of Biological Macromolecules. 2023, 244: 125478.
Resumen: Thermoplastic starch/polyvinyl alcohol (TPS/PVA) films have limitations for being used in long–term applications due to starch retrogradation. This leads to plasticizer migration, especially when low molecular weight plasticizers such as glycerol, are used. In this work, we employed mixtures of oligomers based on glycerol citrates with higher molecular weight than glycerol as plasticizers for potato–based TPS/PVA blends obtained by melt–mixing. This constitutes an alternative to reduce plasticizer migration while keeping high swelling degree, and to provide high mechanical performance. The novelty lies in the usage of these oligomers by melt-mixing technique, aspect not deeply explored previously and that represents the first step towards industrial scalability. Prior to the blending process, oligomers mixtures were prepared with different molar ratios of citric acid (0–40 mol%) and added them. This minimizes the undesirable hydrolysis effect of free carboxylic groups on starch chains. The results demonstrated that the migration of plasticizers in TPS/PVA blends decreased by up to 70 % when the citric acid content increased. This reduction was attributed to the higher molecular weight (the majority in the range 764–2060 Da) and the 3D structure of the oligomers compared to using raw glycerol. Furthermore, the films exhibited a 150 % increase in Young's modulus and tensile strength without a reduction in elongation at break, while maintaining a high gel content, due to a moderate crosslinking.
Patrocinador/es: This work was partially supported by the Spanish Ministry of Science and Ministry of Economy, Industry and Competitiveness and the Spanish MINECO (PID2019-108632RB-100 and PID2021-126445OB-I00, respectively) and Generalitat Valenciana (PROMETEO CIPROM/2021/027). This work was also partially supported by the TED2021-130389B-C21 research project, funded by MCIN/AEI/10.13039/501100011033 and by the European Union NextGenerationEU/PRTR. Juana M. Pérez acknowledges support from University of Almería (HIPATIA2021_04 fellowship).
ISSN: 0141-8130 (Print) | 1879-0003 (Online)
DOI: 10.1016/j.ijbiomac.2023.125478
Idioma: eng
Tipo: info:eu-repo/semantics/article
Derechos: © 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (
Revisión científica: si
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