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Materials 2018, 11(10), 1943;

Poly(Lactic Acid)-Based Nanobiocomposites with Modulated Degradation Rates

Department of Industrial Engineering, University of Salerno Via Giovanni Paolo II, 132, 84084 Fisciano (SA), Italy
Institut de Chimie de Clermont Ferrand (ICCF), UMR 6296 Université Clermont Auvergne, CNRS, Sigma Clermont, ICCF, F-63000 Clermont-Ferrand, France
Authors to whom correspondence should be addressed.
Received: 30 August 2018 / Revised: 19 September 2018 / Accepted: 5 October 2018 / Published: 11 October 2018
(This article belongs to the Special Issue Durability and Life time of Polymers, Composites and Nanocomposites)
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In the field of biodegradable polymers such as poly(Lactic Acid) (PLA), it is quite well known that their kinetics of hydrolysis strongly depend on the pH of the hydrolyzing medium. The idea explored during this study focused on PLA, is the addition of additives that are able to control the pH of water when it diffuses inside the polymer. For instance, acids (i.e. succinic acid, also used as food additive) are bio- and eco- friendly additives that are able to play this role. In order to control the release of these molecules and their dispersion inside the polymer, their intercalation in biocompatible nanofillers like layered double hydroxides (LDH) is here considered. The additives have been dispersed in the polymer by melt compounding, commonly used in the plastic industry. Several composites of PLA (4032D) and LDH intercalated with organic acids (succinic, fumaric, and ascorbic acid) have been obtained by an extrusion process. From all extruded materials, PLA films obtained by compression molding were then subjected to hydrolysis tests. The results showed that the mentioned molecules, dispersed in the polymer, are able to control the rate of hydrolysis, and experimental results show an increase of degradation time for samples containing LDH-organic acid (in particular with LDH-succinic acid), making such hybrid additives an appropriate and efficient solution for PLA. View Full-Text
Keywords: lifetime durability; degradation; poly(Lactic Acid); layered double hydroxides; nanobiocomposites lifetime durability; degradation; poly(Lactic Acid); layered double hydroxides; nanobiocomposites

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Valentina, I.; Haroutioun, A.; Fabrice, L.; Vincent, V.; Roberto, P. Poly(Lactic Acid)-Based Nanobiocomposites with Modulated Degradation Rates. Materials 2018, 11, 1943.

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