Journal
JOURNAL OF APPLIED POLYMER SCIENCE
Volume 134, Issue 24, Pages -Publisher
WILEY
DOI: 10.1002/APP.44974
Keywords
bio-based nanocomposites; poly(lactic acid) (PLA); montmorillonite; thermo-oxidative stability
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Funding
- EU in the field of Marie Curie Action-PEOPLE 2011-IEF [300302]
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In this work, an innovative approach to overcome the issue of the poor thermo-oxidative stability of polymer/clay nano-composites is proposed. Specifically, biodegradable poly(lactic 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. (C) 2017 Wiley Periodicals, Inc.
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