Thermo-oxidative stabilization of poly(lactic acid) with antioxidant intercalated layered double hydroxides

Lucía Pérez Amaro, Francesca Cicogna, Elisa Passaglia, Elisabetta Morici, Werner Oberhauser, Sahar Al-Malaika, Nadka Tz Dintcheva, Serena Coiai*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Two antioxidant modified layered double hydroxides (AO-LDHs) were successfully prepared by theintercalation of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid (IrganoxCOOH) and 6-hydroxy-2,5,7,8-tetramethylchroman-2-carboxylic acid (Trolox) in the layered structure of LDH. It was foundthat by anchoring the phenolic moieties to the LDH layers the antioxidant power is retained in the caseof Trolox, and even amplified in the case of IrganoxCOOH. A small amount of the two AO-LDHs wasincorporated into poly(lactic acid), PLA, by solution mixing and melt extrusion. The thermo-oxidativestability of the composites was compared with that of the neat PLA and PLA containing free AOs. SECanalysis indicates that, after a controlled period of ageing, both the AO-LDHs protect the PLA fromchain scission. The oxidation induction time (OIT, DSC) at 230 °C shows also the beneficial effects ofthe presence of the functional filler in the polymer matrix. Further, results from a preliminary migrationtest suggest that the AO species have a low tendency to migrate away from the AO-LDHs embedded inthe polymer matrix thus keeping the AO protected inside the nanofiller layers thereby remaining activefor a longer time.
Original languageEnglish
Pages (from-to)92-100
Number of pages9
JournalPolymer Degradation and Stability
Volume133
Early online date12 Aug 2016
DOIs
Publication statusPublished - Nov 2016

Bibliographical note

© 2016, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/

Keywords

  • antioxidants
  • layered double hydroxides (LDHs)
  • poly(lactic acid)
  • thermo-oxidative degradation

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