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Article

Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites

1
CNR-IMM, Via Santa Sofia 64, 95123 Catania, Italy
2
CNR-IPCB, Via P. Gaifami 18, 95126 Catania, Italy
3
Department of Civil, Environmental, Aerospace, Materials Engineering, University of Palermo, Viale delle Scienze, 90128 Palermo, Italy
4
Department of Chemical, Materials and Production Engineering, University of Naples Federico II, Piazzale V. Tecchio 80, 80125 Naples, Italy
5
CNR- SCITEC, Via A. Corti 12, 20133 Milano, Italy
*
Author to whom correspondence should be addressed.
Polymers 2020, 12(5), 1034; https://doi.org/10.3390/polym12051034
Received: 9 April 2020 / Revised: 27 April 2020 / Accepted: 30 April 2020 / Published: 2 May 2020
(This article belongs to the Special Issue Degradation and Stabilization of Polymer Systems: Recent Advances)
The photo-oxidative degradation processes of bio-based PA11 nanocomposites containing montmorillonite (MMT) and the organo-modified Cloisite®30B were investigated to discriminate the influence of organo-modified components on the polymer durability. Indeed, despite the extensive studies reported, there are still ambiguous points to be clarified from the chemical point of view. To this aim, UV-aged materials were analyzed by Size Exclusion Chromatography (SEC), Inductively Coupled Plasma–Mass Spectrometry (ICP-MS) and Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF MS). This enabled determining changes in both chemical structure and Molar Masses (MMs) induced by light, heat and oxygen exposure. The addition of organo-modified nanoclays strongly affected the PA11 light durability, triggering the macromolecular chains scission due to the typical αH, Norrish I and II mechanisms. However, the main contribution in boosting the photo-oxidative degradation is induced by iron impurities contained into the clays. Conversely, thermo-oxidation process performed at 215 °C was unambiguously affected by the presence of the organo-modifiers, whose presence determined an enhancement of crosslinking reactions. View Full-Text
Keywords: PA11; montmorillonite; Cloisite® 30B; nanocomposites; photo-oxidation; thermo-oxidation; bio polyamide PA11; montmorillonite; Cloisite® 30B; nanocomposites; photo-oxidation; thermo-oxidation; bio polyamide
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MDPI and ACS Style

Ussia, M.; Curcuruto, G.; Zampino, D.; Dintcheva, N.T.; Filippone, G.; Mendichi, R.; Carroccio, S.C. Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites. Polymers 2020, 12, 1034. https://doi.org/10.3390/polym12051034

AMA Style

Ussia M, Curcuruto G, Zampino D, Dintcheva NT, Filippone G, Mendichi R, Carroccio SC. Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites. Polymers. 2020; 12(5):1034. https://doi.org/10.3390/polym12051034

Chicago/Turabian Style

Ussia, Martina, Giusy Curcuruto, Daniela Zampino, Nadka T. Dintcheva, Giovanni Filippone, Raniero Mendichi, and Sabrina C. Carroccio 2020. "Role of Organo-Modifier and Metal Impurities of Commercial Nanoclays in the Photo- and Thermo-Oxidation of Polyamide 11 Nanocomposites" Polymers 12, no. 5: 1034. https://doi.org/10.3390/polym12051034

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