Thermo-oxidative stabilization of polylactic acid-based nanocomposites through the incorporation of clay with in-built antioxidant activity

Dintcheva, Nadka Tzankova, Al-Malaika, Sahar, Morici, Elisabetta and Arrigo, Rossella (2017). Thermo-oxidative stabilization of polylactic acid-based nanocomposites through the incorporation of clay with in-built antioxidant activity. Journal of Applied Polymer Science, in pre ,

Abstract

In this work, an innovative approach to overcome the issue of the poor thermo-oxidative stability of polymer/clay nanocomposites is proposed. Specifically, biodegradable polylactic acid (PLA)-based nanocomposites, containing organo-modified clay with in-built antioxidant activity, were prepared. Through a two-step chemical protocol, a hindered phenol antioxidant was chemically linked to the ammonium quaternary salt which was then intercalated between the clay platelets [(AO)OM-Mt]. The nanocomposites were characterized and their thermo-oxidative stability during melt processing and under long-term thermal test conditions was investigated. PLA nanocomposites containing the (AO)OM-Mt showed higher oxidative stability, along with better clay dispersion, compared to PLA-nanocomposites containing commercial clay and a free hindered phenol antioxidant. Obtained results can be explained considering that (AO)OM-Mt may act locally, at the interface, between the silicate layers and the polymer macromolecules, thus contributing to the observed improved stability of the polymer both during processing and under long-term thermal-oxidative conditions.

Publication DOI: https://doi.org/10.1002/app.44974
Divisions: Engineering & Applied Sciences > Chemical engineering & applied chemistry
Engineering & Applied Sciences > Polymer and advanced materials research group
Additional Information: This is the peer reviewed version of the following article: Dintcheva, N. T., Al-Malaika, S., Morici, E., & Arrigo, R. (2017). Thermo-oxidative stabilization of polylactic acid-based nanocomposites through the incorporation of clay with in-built antioxidant activity. Journal of Applied Polymer Science, Early view., which has been published in final form at http://dx.doi.org/10.1002/app.44974. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
Uncontrolled Keywords: bio-based nanocomposites,montmorillonite,polylactic acid,thermo-oxidative stability,PLA,Chemistry(all),Surfaces, Coatings and Films,Polymers and Plastics,Materials Chemistry
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Related URLs: http://www.scopus.com/inward/record.url?scp=85013498884&partnerID=8YFLogxK (Scopus URL)
Published Online Date: 2017-02-20
Authors: Dintcheva, Nadka Tzankova
Al-Malaika, Sahar ( 0000-0002-1378-0603)
Morici, Elisabetta
Arrigo, Rossella

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