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Materials 2017, 10(8), 935;

Influence of Polymer-Clay Interfacial Interactions on the Ignition Time of Polymer/Clay Nanocomposites

School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China
Author to whom correspondence should be addressed.
Received: 14 July 2017 / Revised: 8 August 2017 / Accepted: 8 August 2017 / Published: 11 August 2017
(This article belongs to the Section Advanced Composites)
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Metal ions present on smectite clay (montmorillonite) platelets have preferential reactivity towards peroxy/alkoxy groups during polyamide 6 (PA6) thermal decomposition. This changes the decomposition pathway and negatively affects the ignition response of PA6. To restrict these interfacial interactions, high-temperature-resistant polymers such as polyetherimide (PEI) and polyimide (PI) were used to coat clay layers. PEI was deposited on clay by solution-precipitation, whereas PI was deposited through a solution-imidization-precipitation technique before melt blending with PA6. The absence of polymer-clay interfacial interactions has resulted in a similar time-to-ignition of PA6/PEI-clay (133 s) and PA6/PI-clay (139 s) composites as neat PA6 (140 s). On the contrary, PA6 with conventional ammonium-based surfactant modified clay has showed a huge drop in time-to-ignition (81 s), as expected. The experimental evidences provided herein reveal the role of the catalytic activity of clay during the early stages of polymer decomposition. View Full-Text
Keywords: time-to-ignition; thermo-oxidation; combustion; polyamide 6; clay time-to-ignition; thermo-oxidation; combustion; polyamide 6; clay

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Zope, I.S.; Dasari, A.; Yu, Z.-Z. Influence of Polymer-Clay Interfacial Interactions on the Ignition Time of Polymer/Clay Nanocomposites. Materials 2017, 10, 935.

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